diff --git a/README.md b/README.md
index bb087e8d0..9d7b37480 100644
--- a/README.md
+++ b/README.md
@@ -63,7 +63,7 @@
 ## 🤖 Android
 - Android Studio : Android Studio Koala | 2024.1.1
 - JDK : 17
-- minSDK : 23
+- minSDK : 28
 - targetSDK : 35
 
 ## 🐚 Convertion
diff --git a/app/build.gradle.kts b/app/build.gradle.kts
index 5da8f4c59..caf467be6 100644
--- a/app/build.gradle.kts
+++ b/app/build.gradle.kts
@@ -21,7 +21,7 @@ android {
     // S21: API 33
     defaultConfig {
         applicationId = "com.eatssu.android"
-        minSdk = 23
+        minSdk = 28
         targetSdk = 35
         versionCode = 35
         versionName = "2.1.15"
@@ -52,8 +52,8 @@ android {
             buildConfigField("String", "NAVER_MAPS_CLIENT_ID", "\"$naverMapsClientID\"")
             manifestPlaceholders["NAVER_MAPS_CLIENT_ID"] = naverMapsClientID
 
-            isShrinkResources = false
-            isMinifyEnabled = false
+            isShrinkResources = true
+            isMinifyEnabled = true
             proguardFiles(getDefaultProguardFile("proguard-android-optimize.txt"), "proguard-rules.pro")
         }
 
diff --git a/app/proguard-rules.pro b/app/proguard-rules.pro
index e9a2e3464..2dfb6b766 100644
--- a/app/proguard-rules.pro
+++ b/app/proguard-rules.pro
@@ -23,3 +23,26 @@
 # https://developers.kakao.com/docs/latest/en/getting-started/sdk-android#configure-for-shrinking-and-obfuscation-(optional)
 -keep class com.kakao.sdk.**.model.* { <fields>; }
 -keep class * extends com.google.gson.TypeAdapter
+
+# https://firebase.google.com/docs/database/android/start?hl=ko
+-keepattributes Signature
+
+-keep class com.eatssu.android.data.dto.** {
+  *;
+}
+-keep class com.eatssu.android.data.enums.** {
+  *;
+}
+
+# https://github.com/square/okhttp/pull/6792
+-dontwarn org.bouncycastle.jsse.**
+-dontwarn org.conscrypt.*
+-dontwarn org.openjsse.**
+
+# refrofit2 (with r8 full mode)
+-if interface * { @retrofit2.http.* <methods>; }
+-keep,allowobfuscation interface <1>
+-keep,allowobfuscation,allowshrinking class kotlin.coroutines.Continuation
+-if interface * { @retrofit2.http.* public *** *(...); }
+-keep,allowoptimization,allowshrinking,allowobfuscation class <3>
+-keep,allowobfuscation,allowshrinking class retrofit2.Response
\ No newline at end of file
diff --git a/app/src/main/java/com/eatssu/android/alarm/NotificationReceiver.kt b/app/src/main/java/com/eatssu/android/alarm/NotificationReceiver.kt
index 328646856..ed404748b 100644
--- a/app/src/main/java/com/eatssu/android/alarm/NotificationReceiver.kt
+++ b/app/src/main/java/com/eatssu/android/alarm/NotificationReceiver.kt
@@ -6,8 +6,6 @@ import android.app.PendingIntent
 import android.content.BroadcastReceiver
 import android.content.Context
 import android.content.Intent
-import android.os.Build
-import androidx.annotation.RequiresApi
 import androidx.core.app.NotificationCompat
 import com.eatssu.android.R
 import com.eatssu.android.presentation.login.IntroActivity
@@ -16,7 +14,6 @@ import java.time.LocalDateTime
 
 class NotificationReceiver : BroadcastReceiver() {
 
-    @RequiresApi(Build.VERSION_CODES.O)
     override fun onReceive(context: Context, intent: Intent) {
         // 현재 요일이 평일인 경우에만 알림을 발송
         val currentDay = LocalDateTime.now().dayOfWeek
@@ -29,19 +26,17 @@ class NotificationReceiver : BroadcastReceiver() {
         val notificationManager =
             context.getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager
 
-        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
-            val channel = NotificationChannel(
-                CHANNEL_ID,
-                "점심시간 전 알림",
-                NotificationManager.IMPORTANCE_HIGH // 중요도를 높게 설정
-            ).apply {
-                description = "점심시간 전, 푸시알림을 발송합니다."
-                enableLights(true)
-                enableVibration(true)  // 진동도 활성화
-                lockscreenVisibility = NotificationCompat.VISIBILITY_PUBLIC // 잠금 화면에서도 표시
-            }
-            notificationManager.createNotificationChannel(channel)
+        val channel = NotificationChannel(
+            CHANNEL_ID,
+            "점심시간 전 알림",
+            NotificationManager.IMPORTANCE_HIGH // 중요도를 높게 설정
+        ).apply {
+            description = "점심시간 전, 푸시알림을 발송합니다."
+            enableLights(true)
+            enableVibration(true)  // 진동도 활성화
+            lockscreenVisibility = NotificationCompat.VISIBILITY_PUBLIC // 잠금 화면에서도 표시
         }
+        notificationManager.createNotificationChannel(channel)
 
 
         val intent = Intent(context, IntroActivity::class.java).apply {
diff --git a/app/src/main/java/com/eatssu/android/presentation/MainActivity.kt b/app/src/main/java/com/eatssu/android/presentation/MainActivity.kt
index b6ea8ca4a..0578c9b6f 100644
--- a/app/src/main/java/com/eatssu/android/presentation/MainActivity.kt
+++ b/app/src/main/java/com/eatssu/android/presentation/MainActivity.kt
@@ -9,7 +9,6 @@ import android.os.SystemClock
 import android.view.MenuItem
 import android.view.View.GONE
 import androidx.activity.viewModels
-import androidx.annotation.RequiresApi
 import androidx.core.app.ActivityCompat
 import androidx.core.content.ContextCompat
 import androidx.lifecycle.lifecycleScope
@@ -40,7 +39,6 @@ class MainActivity : BaseActivity<ActivityMainBinding>(ActivityMainBinding::infl
     private val mainViewModel: MainViewModel by viewModels()
     private val myPageViewModel: MyPageViewModel by viewModels()
 
-    @RequiresApi(Build.VERSION_CODES.O)
     @SuppressLint("SuspiciousIndentation")
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
diff --git a/app/src/main/java/com/eatssu/android/presentation/cafeteria/CafeteriaFragment.kt b/app/src/main/java/com/eatssu/android/presentation/cafeteria/CafeteriaFragment.kt
index 7f1ef269e..d91969059 100644
--- a/app/src/main/java/com/eatssu/android/presentation/cafeteria/CafeteriaFragment.kt
+++ b/app/src/main/java/com/eatssu/android/presentation/cafeteria/CafeteriaFragment.kt
@@ -1,11 +1,9 @@
 package com.eatssu.android.presentation.cafeteria
 
-import android.os.Build
 import android.os.Bundle
 import android.view.LayoutInflater
 import android.view.View
 import android.widget.TextView
-import androidx.annotation.RequiresApi
 import androidx.fragment.app.activityViewModels
 import androidx.recyclerview.widget.GridLayoutManager
 import androidx.recyclerview.widget.RecyclerView
@@ -38,7 +36,6 @@ class CafeteriaFragment : BaseFragment<FragmentCafeteriaBinding>(), OnItemListen
         return FragmentCafeteriaBinding.inflate(layoutInflater)
     }
 
-    @RequiresApi(Build.VERSION_CODES.O)
     override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
         super.onViewCreated(view, savedInstanceState)
 
@@ -84,7 +81,6 @@ class CafeteriaFragment : BaseFragment<FragmentCafeteriaBinding>(), OnItemListen
         monthYearText = binding.monthYearTV
     }
 
-    @RequiresApi(Build.VERSION_CODES.O)
     private fun setWeekView() {
         monthYearText?.text = CalendarUtil.selectedDate?.let { monthYearFromDate(it) }
         val days = CalendarUtil.selectedDate?.let { daysInWeekArray(it) }
@@ -95,7 +91,6 @@ class CafeteriaFragment : BaseFragment<FragmentCafeteriaBinding>(), OnItemListen
         calendarRecyclerView?.adapter = calendarAdapter
     }
 
-    @RequiresApi(Build.VERSION_CODES.O)
     fun setCalendarWeekClickListener() {
         binding.btnPreviousWeek.setOnClickListener {
             CalendarUtil.selectedDate = CalendarUtil.selectedDate.minusWeeks(1)
@@ -110,7 +105,6 @@ class CafeteriaFragment : BaseFragment<FragmentCafeteriaBinding>(), OnItemListen
         }
     }
 
-    @RequiresApi(Build.VERSION_CODES.O)
     override fun onItemClick(position: Int, date: LocalDate) {
         CalendarUtil.selectedDate = date
         mainViewModel.setData(date)
diff --git a/app/src/main/java/com/eatssu/android/presentation/cafeteria/CafeteriaViewPagerAdapter.kt b/app/src/main/java/com/eatssu/android/presentation/cafeteria/CafeteriaViewPagerAdapter.kt
index 392ab8f84..cd9841f80 100644
--- a/app/src/main/java/com/eatssu/android/presentation/cafeteria/CafeteriaViewPagerAdapter.kt
+++ b/app/src/main/java/com/eatssu/android/presentation/cafeteria/CafeteriaViewPagerAdapter.kt
@@ -1,7 +1,5 @@
 package com.eatssu.android.presentation.cafeteria
 
-import android.os.Build
-import androidx.annotation.RequiresApi
 import androidx.fragment.app.Fragment
 import androidx.fragment.app.FragmentActivity
 import androidx.viewpager2.adapter.FragmentStateAdapter
@@ -35,7 +33,6 @@ class CafeteriaViewPagerAdapter(fragmentActivity: FragmentActivity) :
     }
 
     // 4. 디폴트로 노출할 Fragment의 위치를 설정
-    @RequiresApi(Build.VERSION_CODES.O)
     fun getDefaultFragmentPosition(): Int {
         // 여기에서 디폴트로 노출할 Fragment의 위치를 반환해줍니다.
         // 예를 들어, 첫 번째 Fragment를 디폴트로 설정하려면 0을 반환합니다.
diff --git a/app/src/main/java/com/eatssu/android/presentation/cafeteria/calendar/CalendarAdapter.kt b/app/src/main/java/com/eatssu/android/presentation/cafeteria/calendar/CalendarAdapter.kt
index 8e3c7a005..44d21d2a0 100644
--- a/app/src/main/java/com/eatssu/android/presentation/cafeteria/calendar/CalendarAdapter.kt
+++ b/app/src/main/java/com/eatssu/android/presentation/cafeteria/calendar/CalendarAdapter.kt
@@ -1,9 +1,7 @@
 package com.eatssu.android.presentation.cafeteria.calendar
 
-import android.os.Build
 import android.view.LayoutInflater
 import android.view.ViewGroup
-import androidx.annotation.RequiresApi
 import androidx.core.content.ContextCompat
 import androidx.recyclerview.widget.RecyclerView
 import com.eatssu.android.R
@@ -34,7 +32,6 @@ internal class CalendarAdapter(
     }
 
 
-    @RequiresApi(Build.VERSION_CODES.O)
     override fun onBindViewHolder(holder: CalendarViewHolder, position: Int) {
         val date = days[position]
         holder.dayOfMonth.text = date.dayOfMonth.toString()
diff --git a/app/src/main/java/com/eatssu/android/presentation/cafeteria/menu/MenuFragment.kt b/app/src/main/java/com/eatssu/android/presentation/cafeteria/menu/MenuFragment.kt
index d16a0b68d..6c7320290 100644
--- a/app/src/main/java/com/eatssu/android/presentation/cafeteria/menu/MenuFragment.kt
+++ b/app/src/main/java/com/eatssu/android/presentation/cafeteria/menu/MenuFragment.kt
@@ -1,11 +1,9 @@
 package com.eatssu.android.presentation.cafeteria.menu
 
-import android.os.Build
 import android.os.Bundle
 import android.view.LayoutInflater
 import android.view.View
 import android.view.ViewGroup
-import androidx.annotation.RequiresApi
 import androidx.fragment.app.Fragment
 import androidx.fragment.app.activityViewModels
 import androidx.fragment.app.viewModels
@@ -69,7 +67,6 @@ class MenuFragment : Fragment() {
         return binding.root
     }
 
-    @RequiresApi(Build.VERSION_CODES.O)
     override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
         super.onViewCreated(view, savedInstanceState)
 
@@ -82,7 +79,6 @@ class MenuFragment : Fragment() {
         observeViewModel()
     }
 
-    @RequiresApi(Build.VERSION_CODES.O)
     fun observeViewModel() {
         mainViewModel.getData().observe(viewLifecycleOwner) { dataReceived ->
 
diff --git a/app/src/main/java/com/eatssu/android/presentation/cafeteria/review/write/menu/ReviewWriteMenuActivity.kt b/app/src/main/java/com/eatssu/android/presentation/cafeteria/review/write/menu/ReviewWriteMenuActivity.kt
index 744461e19..54609805b 100644
--- a/app/src/main/java/com/eatssu/android/presentation/cafeteria/review/write/menu/ReviewWriteMenuActivity.kt
+++ b/app/src/main/java/com/eatssu/android/presentation/cafeteria/review/write/menu/ReviewWriteMenuActivity.kt
@@ -1,10 +1,8 @@
 package com.eatssu.android.presentation.cafeteria.review.write.menu
 
 import android.content.Intent
-import android.os.Build
 import android.os.Bundle
 import androidx.activity.viewModels
-import androidx.annotation.RequiresApi
 import androidx.lifecycle.lifecycleScope
 import androidx.recyclerview.widget.LinearLayoutManager
 import com.eatssu.android.databinding.ActivityReviewWriteMenuBinding
@@ -24,7 +22,6 @@ class ReviewWriteMenuActivity :
 
     private lateinit var variableMenuPickAdapter: VariableMenuPickAdapter
 
-    @RequiresApi(Build.VERSION_CODES.O)
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         toolbarTitle.text = "리뷰 남기기" // 툴바 제목 설정
diff --git a/app/src/main/java/com/eatssu/android/presentation/mypage/MyPageFragment.kt b/app/src/main/java/com/eatssu/android/presentation/mypage/MyPageFragment.kt
index 122f34014..6f5848f20 100644
--- a/app/src/main/java/com/eatssu/android/presentation/mypage/MyPageFragment.kt
+++ b/app/src/main/java/com/eatssu/android/presentation/mypage/MyPageFragment.kt
@@ -10,7 +10,6 @@ import android.os.Bundle
 import android.provider.Settings
 import android.view.LayoutInflater
 import android.view.View
-import androidx.annotation.RequiresApi
 import androidx.appcompat.app.AlertDialog
 import androidx.core.content.ContextCompat
 import androidx.fragment.app.activityViewModels
@@ -20,8 +19,8 @@ import androidx.lifecycle.lifecycleScope
 import androidx.lifecycle.repeatOnLifecycle
 import com.eatssu.android.R
 import com.eatssu.android.databinding.FragmentMyPageBinding
-import com.eatssu.android.presentation.base.BaseFragment
 import com.eatssu.android.presentation.MainViewModel
+import com.eatssu.android.presentation.base.BaseFragment
 import com.eatssu.android.presentation.login.LoginActivity
 import com.eatssu.android.presentation.mypage.myreview.MyReviewListActivity
 import com.eatssu.android.presentation.mypage.terms.WebViewActivity
@@ -43,7 +42,6 @@ class MyPageFragment : BaseFragment<FragmentMyPageBinding>() {
         return FragmentMyPageBinding.inflate(layoutInflater)
     }
 
-    @RequiresApi(Build.VERSION_CODES.O)
     override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
         super.onViewCreated(view, savedInstanceState)
 
@@ -52,7 +50,6 @@ class MyPageFragment : BaseFragment<FragmentMyPageBinding>() {
         setOnClickListener()
     }
 
-    @RequiresApi(Build.VERSION_CODES.O)
     private fun setupObservers() {
         viewLifecycleOwner.lifecycleScope.launch {
             repeatOnLifecycle(Lifecycle.State.STARTED) {
@@ -73,7 +70,6 @@ class MyPageFragment : BaseFragment<FragmentMyPageBinding>() {
         }
     }
 
-    @RequiresApi(Build.VERSION_CODES.O)
     private fun handleAlarmSwitchChange(isChecked: Boolean) {
         val nowDatetime = LocalDateTime.now()
         val formattedDate = nowDatetime.format(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm"))
@@ -91,7 +87,6 @@ class MyPageFragment : BaseFragment<FragmentMyPageBinding>() {
         }
     }
 
-    @RequiresApi(Build.VERSION_CODES.O)
     private fun setOnClickListener() {
         binding.llMyInfo.setOnClickListener {
             startActivity(Intent(requireContext(), UserInfoActivity::class.java))
@@ -137,7 +132,6 @@ class MyPageFragment : BaseFragment<FragmentMyPageBinding>() {
         }
     }
 
-    @RequiresApi(Build.VERSION_CODES.O)
     private fun showNotificationPermissionDialog() {
         AlertDialog.Builder(requireContext())
             .setTitle("알림 권한 필요")
@@ -182,7 +176,6 @@ class MyPageFragment : BaseFragment<FragmentMyPageBinding>() {
         }
     }
 
-    @RequiresApi(Build.VERSION_CODES.O)
     private fun openAppNotificationSettings(context: Context) {
         val intent = Intent(Settings.ACTION_APP_NOTIFICATION_SETTINGS).apply {
             putExtra(Settings.EXTRA_APP_PACKAGE, context.packageName)
diff --git a/app/src/main/java/com/eatssu/android/presentation/util/CalendarUtil.kt b/app/src/main/java/com/eatssu/android/presentation/util/CalendarUtil.kt
index cd95c0ac8..756d0780e 100644
--- a/app/src/main/java/com/eatssu/android/presentation/util/CalendarUtil.kt
+++ b/app/src/main/java/com/eatssu/android/presentation/util/CalendarUtil.kt
@@ -1,12 +1,9 @@
 package com.eatssu.android.presentation.util
 
-import android.os.Build
-import androidx.annotation.RequiresApi
 import java.text.SimpleDateFormat
 import java.time.DayOfWeek
 import java.time.LocalDate
 import java.time.format.DateTimeFormatter
-import java.util.Calendar
 import java.util.Date
 import java.util.Locale
 
@@ -14,13 +11,11 @@ import java.util.Locale
 object CalendarUtil {
     lateinit var selectedDate: LocalDate
 
-    @RequiresApi(Build.VERSION_CODES.O)
     fun monthYearFromDate(date: LocalDate): String {
         val formatter = DateTimeFormatter.ofPattern("yyyy.MM")
         return date.format(formatter)
     }
 
-    @RequiresApi(Build.VERSION_CODES.O)
     fun daysInWeekArray(selectedDate: LocalDate): ArrayList<LocalDate> {
         val days = ArrayList<LocalDate>()
         var current = sundayForDate(selectedDate)
@@ -32,7 +27,6 @@ object CalendarUtil {
         return days
     }
 
-    @RequiresApi(Build.VERSION_CODES.O)
     private fun sundayForDate(current: LocalDate): LocalDate? {
         var current = current
         val oneWeekAgo = current.minusWeeks(1)
@@ -50,15 +44,8 @@ object CalendarUtil {
     }
 
     fun getNextDayDate(): String {
-        return if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
-            val nextDay = LocalDate.now().plusDays(1)
-            val formatter = DateTimeFormatter.ofPattern("yyyyMMdd", Locale.getDefault())
-            nextDay.format(formatter)
-        } else {
-            val calendar = Calendar.getInstance()
-            calendar.add(Calendar.DAY_OF_MONTH, 1)
-            val formatter = SimpleDateFormat("yyyyMMdd", Locale.getDefault())
-            formatter.format(calendar.time)
-        }
+        val nextDay = LocalDate.now().plusDays(1)
+        val formatter = DateTimeFormatter.ofPattern("yyyyMMdd", Locale.getDefault())
+        return nextDay.format(formatter)
     }
 }
\ No newline at end of file
diff --git a/app/src/main/java/com/eatssu/android/presentation/widget/MealWorker.kt b/app/src/main/java/com/eatssu/android/presentation/widget/MealWorker.kt
index 005c33af3..c73cf180d 100644
--- a/app/src/main/java/com/eatssu/android/presentation/widget/MealWorker.kt
+++ b/app/src/main/java/com/eatssu/android/presentation/widget/MealWorker.kt
@@ -1,8 +1,6 @@
 package com.eatssu.android.presentation.widget
 
 import android.content.Context
-import android.os.Build
-import androidx.annotation.RequiresApi
 import androidx.glance.GlanceId
 import androidx.glance.appwidget.GlanceAppWidgetManager
 import androidx.glance.appwidget.state.updateAppWidgetState
@@ -32,7 +30,6 @@ class MealWorker @AssistedInject constructor(
     companion object {
         private val uniqueWorkName = MealWorker::class.java.simpleName
 
-        @RequiresApi(Build.VERSION_CODES.O)
         fun enqueue(context: Context) {
             val manager = WorkManager.getInstance(context)
             val requestBuilder = PeriodicWorkRequestBuilder<MealWorker>(
@@ -48,7 +45,6 @@ class MealWorker @AssistedInject constructor(
         }
     }
 
-    @RequiresApi(Build.VERSION_CODES.O)
     override suspend fun doWork(): Result {
         val manager = GlanceAppWidgetManager(context)
         val glanceIds = manager.getGlanceIds(MealWidget::class.java)
diff --git a/app/src/main/java/com/eatssu/android/presentation/widget/WidgetCacheManager.kt b/app/src/main/java/com/eatssu/android/presentation/widget/WidgetCacheManager.kt
index 4d5732dc5..8691dca3c 100644
--- a/app/src/main/java/com/eatssu/android/presentation/widget/WidgetCacheManager.kt
+++ b/app/src/main/java/com/eatssu/android/presentation/widget/WidgetCacheManager.kt
@@ -1,8 +1,6 @@
 package com.eatssu.android.presentation.widget
 
 
-import android.os.Build
-import androidx.annotation.RequiresApi
 import com.eatssu.android.domain.model.WidgetMealInfo
 import com.eatssu.common.enums.Restaurant
 import timber.log.Timber
@@ -29,7 +27,6 @@ object WidgetCacheManager {
     /**
      * 캐시된 데이터가 유효한지 확인
      */
-    @RequiresApi(Build.VERSION_CODES.O)
     private fun isCacheValid(cachedData: CachedMealData, currentDate: String): Boolean {
         val now = LocalDateTime.now()
         val timeDiff = java.time.Duration.between(cachedData.timestamp, now)
@@ -41,7 +38,6 @@ object WidgetCacheManager {
     /**
      * 캐시에서 식당별 메뉴 데이터 조회
      */
-    @RequiresApi(Build.VERSION_CODES.O)
     fun getCachedMealData(restaurant: Restaurant, currentDate: String): WidgetMealInfo? {
         val cachedData = cacheMap[restaurant] ?: return null
 
@@ -58,7 +54,6 @@ object WidgetCacheManager {
     /**
      * 식당별 메뉴 데이터를 캐시에 저장
      */
-    @RequiresApi(Build.VERSION_CODES.O)
     fun cacheMealData(restaurant: Restaurant, mealInfo: WidgetMealInfo, date: String) {
         val cachedData = CachedMealData(
             mealInfo = mealInfo,
diff --git a/app/src/main/java/com/eatssu/android/presentation/widget/ui/MealWidget.kt b/app/src/main/java/com/eatssu/android/presentation/widget/ui/MealWidget.kt
index d2fb68b11..0ebba1249 100644
--- a/app/src/main/java/com/eatssu/android/presentation/widget/ui/MealWidget.kt
+++ b/app/src/main/java/com/eatssu/android/presentation/widget/ui/MealWidget.kt
@@ -1,8 +1,6 @@
 package com.eatssu.android.presentation.widget.ui
 
 import android.content.Context
-import android.os.Build
-import androidx.annotation.RequiresApi
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.runtime.getValue
@@ -68,7 +66,6 @@ class MealWidget : GlanceAppWidget() {
         fun loadRestaurantByFileKeyUseCase(): LoadRestaurantByFileKeyUseCase
     }
 
-    @RequiresApi(Build.VERSION_CODES.O)
     override suspend fun provideGlance(context: Context, id: GlanceId) {
         provideContent {
             val appContext = context.applicationContext
@@ -164,7 +161,6 @@ class MealWidget : GlanceAppWidget() {
         }
     }
 
-    @RequiresApi(Build.VERSION_CODES.O)
     @Composable
     private fun MealWidgetContent(
         mealTime: String,
@@ -202,7 +198,6 @@ class MealWidget : GlanceAppWidget() {
         )
     }
 
-    @RequiresApi(Build.VERSION_CODES.O)
     @Composable
     fun MealWidgetError(
         mealTime: String,
@@ -297,7 +292,6 @@ class MealWidget : GlanceAppWidget() {
         }
     }
 
-    @RequiresApi(Build.VERSION_CODES.O)
     @OptIn(ExperimentalGlancePreviewApi::class)
     @Preview
     @Composable
@@ -305,7 +299,6 @@ class MealWidget : GlanceAppWidget() {
         MealWidgetContent("저녁", listOf(listOf("밥", "국", "반찬", "음료")), Restaurant.DODAM.korean)
     }
 
-    @RequiresApi(Build.VERSION_CODES.O)
     @OptIn(ExperimentalGlancePreviewApi::class)
     @Preview
     @Composable
diff --git a/app/src/main/java/com/eatssu/android/presentation/widget/ui/WidgetSettingActivity.kt b/app/src/main/java/com/eatssu/android/presentation/widget/ui/WidgetSettingActivity.kt
index fb9db2f79..fa77a9a06 100644
--- a/app/src/main/java/com/eatssu/android/presentation/widget/ui/WidgetSettingActivity.kt
+++ b/app/src/main/java/com/eatssu/android/presentation/widget/ui/WidgetSettingActivity.kt
@@ -2,11 +2,9 @@ package com.eatssu.android.presentation.widget.ui
 
 import android.appwidget.AppWidgetManager
 import android.content.Intent
-import android.os.Build
 import android.os.Bundle
 import androidx.activity.ComponentActivity
 import androidx.activity.compose.setContent
-import androidx.annotation.RequiresApi
 import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableStateOf
@@ -32,7 +30,6 @@ class WidgetSettingActivity : ComponentActivity() {
     @Inject
     lateinit var saveRestaurantByFileKeyUseCase: SaveRestaurantByFileKeyUseCase
 
-    @RequiresApi(Build.VERSION_CODES.O)
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         setContent {
diff --git a/app/src/main/java/com/eatssu/android/presentation/widget/util/WidgetDataDisplayManager.kt b/app/src/main/java/com/eatssu/android/presentation/widget/util/WidgetDataDisplayManager.kt
index 4efe91b04..959f6a37c 100644
--- a/app/src/main/java/com/eatssu/android/presentation/widget/util/WidgetDataDisplayManager.kt
+++ b/app/src/main/java/com/eatssu/android/presentation/widget/util/WidgetDataDisplayManager.kt
@@ -1,7 +1,5 @@
 package com.eatssu.android.presentation.widget.util
 
-import android.os.Build
-import androidx.annotation.RequiresApi
 import com.eatssu.android.domain.model.WidgetMealInfo
 import com.eatssu.android.domain.usecase.widget.GetTodayMealUseCase
 import com.eatssu.android.domain.usecase.widget.MealState
@@ -35,7 +33,6 @@ sealed class MealInfoState {
 
 object WidgetDataDisplayManager {
 
-    @RequiresApi(Build.VERSION_CODES.O)
     internal suspend fun fetchMealInfo(
         getMealsUseCase: GetTodayMealUseCase,
         requestedMealTime: MealTime,
@@ -109,7 +106,6 @@ object WidgetDataDisplayManager {
         return emptyMealInfo
     }
 
-    @RequiresApi(Build.VERSION_CODES.O)
     internal fun getCurrentMealTime(): MealTime {
         val currentTime = LocalTime.now()
         val morningEnd = LocalTime.of(9, 0)
diff --git a/app/src/main/res/drawable-v24/ic_add_pic.png b/app/src/main/res/drawable/ic_add_pic.png
similarity index 100%
rename from app/src/main/res/drawable-v24/ic_add_pic.png
rename to app/src/main/res/drawable/ic_add_pic.png
diff --git a/app/src/main/res/drawable-v24/ic_bell.png b/app/src/main/res/drawable/ic_bell.png
similarity index 100%
rename from app/src/main/res/drawable-v24/ic_bell.png
rename to app/src/main/res/drawable/ic_bell.png
diff --git a/app/src/main/res/drawable-v24/ic_profile.png b/app/src/main/res/drawable/ic_profile.png
similarity index 100%
rename from app/src/main/res/drawable-v24/ic_profile.png
rename to app/src/main/res/drawable/ic_profile.png
diff --git a/app/src/main/res/drawable-v24/ic_review.png b/app/src/main/res/drawable/ic_review.png
similarity index 100%
rename from app/src/main/res/drawable-v24/ic_review.png
rename to app/src/main/res/drawable/ic_review.png
diff --git a/app/src/main/res/drawable-v24/ic_setting.png b/app/src/main/res/drawable/ic_setting.png
similarity index 100%
rename from app/src/main/res/drawable-v24/ic_setting.png
rename to app/src/main/res/drawable/ic_setting.png
diff --git a/app/src/main/res/drawable/img_developer.png b/app/src/main/res/drawable/img_developer.png
index 4675ba0f2..99b8fa120 100644
Binary files a/app/src/main/res/drawable/img_developer.png and b/app/src/main/res/drawable/img_developer.png differ
diff --git a/app/src/main/res/drawable/img_dodam.jpeg b/app/src/main/res/drawable/img_dodam.jpeg
index a61e689e7..5b5fc1198 100644
Binary files a/app/src/main/res/drawable/img_dodam.jpeg and b/app/src/main/res/drawable/img_dodam.jpeg differ
diff --git a/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml b/app/src/main/res/mipmap-anydpi/ic_launcher.xml
similarity index 100%
rename from app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml
rename to app/src/main/res/mipmap-anydpi/ic_launcher.xml
diff --git a/app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml b/app/src/main/res/mipmap-anydpi/ic_launcher_round.xml
similarity index 100%
rename from app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml
rename to app/src/main/res/mipmap-anydpi/ic_launcher_round.xml
diff --git a/core/design-system/build.gradle.kts b/core/design-system/build.gradle.kts
index 1c27707eb..df50f8b7d 100644
--- a/core/design-system/build.gradle.kts
+++ b/core/design-system/build.gradle.kts
@@ -8,7 +8,7 @@ android {
     compileSdk = 35
 
     defaultConfig {
-        minSdk = 23
+        minSdk = 28
 
         testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
         consumerProguardFiles("consumer-rules.pro")
diff --git a/core/design-system/src/main/res/font/font.xml b/core/design-system/src/main/res/font/font.xml
deleted file mode 100644
index 699cbc1c4..000000000
--- a/core/design-system/src/main/res/font/font.xml
+++ /dev/null
@@ -1,42 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<font-family xmlns:android="http://schemas.android.com/apk/res/android"
-    xmlns:app="http://schemas.android.com/apk/res-auto">
-
-    <font
-        android:font="@font/pretendard_black"
-        app:font="@font/pretendard_black" />
-
-    <font
-        android:font="@font/pretendard_bold"
-        android:fontWeight="700"
-        app:font="@font/pretendard_bold" />
-
-    <font
-        android:font="@font/pretendard_extrabold"
-        app:font="@font/pretendard_extrabold" />
-
-    <font
-        android:font="@font/pretendard_extralight"
-        app:font="@font/pretendard_extralight" />
-
-    <font
-        android:font="@font/pretendard_light"
-        app:font="@font/pretendard_light" />
-
-    <font
-        android:font="@font/pretendard_medium"
-        app:font="@font/pretendard_medium" />
-
-    <font
-        android:font="@font/pretendard_regular"
-        app:font="@font/pretendard_regular" />
-
-    <font
-        android:font="@font/pretendard_semibold"
-        app:font="@font/pretendard_semibold" />
-
-    <font
-        android:font="@font/pretendard_thin"
-        app:font="@font/pretendard_thin" />
-</font-family>
-    
diff --git a/core/design-system/src/main/res/font/pretendard_black.ttf b/core/design-system/src/main/res/font/pretendard_black.ttf
deleted file mode 100644
index d0c1db81f..000000000
Binary files a/core/design-system/src/main/res/font/pretendard_black.ttf and /dev/null differ
diff --git a/core/design-system/src/main/res/font/pretendard_bold.ttf b/core/design-system/src/main/res/font/pretendard_bold.ttf
deleted file mode 100644
index fb07fc65e..000000000
Binary files a/core/design-system/src/main/res/font/pretendard_bold.ttf and /dev/null differ
diff --git a/core/design-system/src/main/res/font/pretendard_bold.xml b/core/design-system/src/main/res/font/pretendard_bold.xml
new file mode 100644
index 000000000..655998d2d
--- /dev/null
+++ b/core/design-system/src/main/res/font/pretendard_bold.xml
@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="utf-8"?>
+<font-family xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto">
+    <font
+        android:fontVariationSettings="'wght' 700"
+        app:font="@font/pretendard_variable" />
+
+</font-family>
\ No newline at end of file
diff --git a/core/design-system/src/main/res/font/pretendard_extrabold.ttf b/core/design-system/src/main/res/font/pretendard_extrabold.ttf
deleted file mode 100644
index 9d5fe0728..000000000
Binary files a/core/design-system/src/main/res/font/pretendard_extrabold.ttf and /dev/null differ
diff --git a/core/design-system/src/main/res/font/pretendard_extralight.ttf b/core/design-system/src/main/res/font/pretendard_extralight.ttf
deleted file mode 100644
index 09e654284..000000000
Binary files a/core/design-system/src/main/res/font/pretendard_extralight.ttf and /dev/null differ
diff --git a/core/design-system/src/main/res/font/pretendard_light.ttf b/core/design-system/src/main/res/font/pretendard_light.ttf
deleted file mode 100644
index 2e8541d69..000000000
Binary files a/core/design-system/src/main/res/font/pretendard_light.ttf and /dev/null differ
diff --git a/core/design-system/src/main/res/font/pretendard_medium.ttf b/core/design-system/src/main/res/font/pretendard_medium.ttf
deleted file mode 100644
index 1db67c68f..000000000
Binary files a/core/design-system/src/main/res/font/pretendard_medium.ttf and /dev/null differ
diff --git a/core/design-system/src/main/res/font/pretendard_medium.xml b/core/design-system/src/main/res/font/pretendard_medium.xml
new file mode 100644
index 000000000..18d442e53
--- /dev/null
+++ b/core/design-system/src/main/res/font/pretendard_medium.xml
@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="utf-8"?>
+<font-family xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto">
+    <font
+        android:fontVariationSettings="'wght' 500"
+        app:font="@font/pretendard_variable" />
+
+</font-family>
\ No newline at end of file
diff --git a/core/design-system/src/main/res/font/pretendard_regular.ttf b/core/design-system/src/main/res/font/pretendard_regular.ttf
deleted file mode 100644
index 01147e999..000000000
Binary files a/core/design-system/src/main/res/font/pretendard_regular.ttf and /dev/null differ
diff --git a/core/design-system/src/main/res/font/pretendard_regular.xml b/core/design-system/src/main/res/font/pretendard_regular.xml
new file mode 100644
index 000000000..683efb1d3
--- /dev/null
+++ b/core/design-system/src/main/res/font/pretendard_regular.xml
@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="utf-8"?>
+<font-family xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto">
+    <font
+        android:fontVariationSettings="'wght' 400"
+        app:font="@font/pretendard_variable" />
+
+</font-family>
\ No newline at end of file
diff --git a/core/design-system/src/main/res/font/pretendard_semibold.ttf b/core/design-system/src/main/res/font/pretendard_semibold.ttf
deleted file mode 100644
index 9f2690f09..000000000
Binary files a/core/design-system/src/main/res/font/pretendard_semibold.ttf and /dev/null differ
diff --git a/core/design-system/src/main/res/font/pretendard_semibold.xml b/core/design-system/src/main/res/font/pretendard_semibold.xml
new file mode 100644
index 000000000..22e372552
--- /dev/null
+++ b/core/design-system/src/main/res/font/pretendard_semibold.xml
@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="utf-8"?>
+<font-family xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto">
+    <font
+        android:fontVariationSettings="'wght' 600"
+        app:font="@font/pretendard_variable" />
+
+</font-family>
\ No newline at end of file
diff --git a/core/design-system/src/main/res/font/pretendard_thin.ttf b/core/design-system/src/main/res/font/pretendard_thin.ttf
deleted file mode 100644
index fe9825f1b..000000000
Binary files a/core/design-system/src/main/res/font/pretendard_thin.ttf and /dev/null differ
diff --git a/core/design-system/src/main/res/font/pretendard_variable.ttf b/core/design-system/src/main/res/font/pretendard_variable.ttf
new file mode 100644
index 000000000..32b0811ea
Binary files /dev/null and b/core/design-system/src/main/res/font/pretendard_variable.ttf differ