diff --git a/Gemfile b/Gemfile
index c23a489..0d8ad94 100644
--- a/Gemfile
+++ b/Gemfile
@@ -7,8 +7,8 @@ git_source(:github) { |repo_name| "https://github.com/#{repo_name}" }
 
 # Web Services
 gem 'puma', '~> 6.4.2'
-gem 'sinatra', '~> 3.1.0'
-gem 'sinatra-contrib', '~> 3.1.0'
+gem 'sinatra', '~> 4.0.0'
+gem 'sinatra-contrib', '~> 4.0.0'
 
 # Background Job Service
 gem 'sidekiq', '~> 7.1.4'
diff --git a/Gemfile.lock b/Gemfile.lock
index a5b52a4..f9c877c 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -96,9 +96,12 @@ GEM
     puma (6.4.2)
       nio4r (~> 2.0)
     racc (1.7.1)
-    rack (2.2.9)
-    rack-protection (3.1.0)
-      rack (~> 2.2, >= 2.2.4)
+    rack (3.0.10)
+    rack-protection (4.0.0)
+      base64 (>= 0.1.0)
+      rack (>= 3.0.0, < 4)
+    rack-session (2.0.0)
+      rack (>= 3.0.0)
     rack-test (2.1.0)
       rack (>= 1.3)
     rainbow (3.1.1)
@@ -154,16 +157,17 @@ GEM
       redis-client (>= 0.14.0)
     sidekiq-failures (1.0.4)
       sidekiq (>= 4.0.0)
-    sinatra (3.1.0)
+    sinatra (4.0.0)
       mustermann (~> 3.0)
-      rack (~> 2.2, >= 2.2.4)
-      rack-protection (= 3.1.0)
+      rack (>= 3.0.0, < 4)
+      rack-protection (= 4.0.0)
+      rack-session (>= 2.0.0, < 3)
       tilt (~> 2.0)
-    sinatra-contrib (3.1.0)
-      multi_json
+    sinatra-contrib (4.0.0)
+      multi_json (>= 0.0.2)
       mustermann (~> 3.0)
-      rack-protection (= 3.1.0)
-      sinatra (= 3.1.0)
+      rack-protection (= 4.0.0)
+      sinatra (= 4.0.0)
       tilt (~> 2.0)
     sqlite3 (1.6.9)
       mini_portile2 (~> 2.8.0)
@@ -171,7 +175,7 @@ GEM
     terminal-table (3.0.2)
       unicode-display_width (>= 1.1.1, < 3)
     thor (1.2.2)
-    tilt (2.2.0)
+    tilt (2.3.0)
     timeout (0.4.1)
     tzinfo (2.0.6)
       concurrent-ruby (~> 1.0)
@@ -201,8 +205,8 @@ DEPENDENCIES
   settingslogic (~> 2.0.9)
   sidekiq (~> 7.1.4)
   sidekiq-failures (~> 1.0.4)
-  sinatra (~> 3.1.0)
-  sinatra-contrib (~> 3.1.0)
+  sinatra (~> 4.0.0)
+  sinatra-contrib (~> 4.0.0)
   sqlite3 (~> 1.6.9)
 
 BUNDLED WITH