diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index f3f0e16..027bf37 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -29,7 +29,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-22.04]
-        scala: [2.13, 3]
+        scala: [3.9.0, 3.3.8]
         java: [temurin@21, temurin@17, temurin@11]
     runs-on: ${{ matrix.os }}
     timeout-minutes: 60
@@ -179,22 +179,22 @@ jobs:
         if: matrix.java == 'temurin@11' && steps.setup-java-temurin-11.outputs.cache-hit == 'false'
         run: sbt +update
 
-      - name: Download target directories (2.13)
+      - name: Download target directories (3.9.0)
         uses: actions/download-artifact@v6
         with:
-          name: target-${{ matrix.os }}-${{ matrix.java }}-2.13
+          name: target-${{ matrix.os }}-${{ matrix.java }}-3.9.0
 
-      - name: Inflate target directories (2.13)
+      - name: Inflate target directories (3.9.0)
         run: |
           tar xf targets.tar
           rm targets.tar
 
-      - name: Download target directories (3)
+      - name: Download target directories (3.3.8)
         uses: actions/download-artifact@v6
         with:
-          name: target-${{ matrix.os }}-${{ matrix.java }}-3
+          name: target-${{ matrix.os }}-${{ matrix.java }}-3.3.8
 
-      - name: Inflate target directories (3)
+      - name: Inflate target directories (3.3.8)
         run: |
           tar xf targets.tar
           rm targets.tar
@@ -282,7 +282,7 @@ jobs:
       - name: Submit Dependencies
         uses: scalacenter/sbt-dependency-submission@v2
         with:
-          modules-ignore: root_2.13 root_3 sbt-http4s-org-scalafix-internal_2.13 sbt-http4s-org-scalafix-internal_3
+          modules-ignore: root_3 root_3 sbt-http4s-org-scalafix-internal_3 sbt-http4s-org-scalafix-internal_3
           configs-ignore: test scala-tool scala-doc-tool test-internal
 
   coverage:
@@ -290,7 +290,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-22.04]
-        scala: [2.13.18]
+        scala: [3.9.0]
         java: [temurin@8]
     runs-on: ${{ matrix.os }}
     steps:
diff --git a/build.sbt b/build.sbt
index 01a7d55..c0f71b4 100644
--- a/build.sbt
+++ b/build.sbt
@@ -33,7 +33,7 @@ ThisBuild / githubWorkflowAddedJobs ++= Seq(
   )
 )
 
-val Scala213 = "2.13.18"
+val Scala213 = "3.9.0"
 val Scala3 = "3.3.8"
 ThisBuild / scalaVersion := Scala213
 ThisBuild / crossScalaVersions := Seq(Scala213, Scala3)
diff --git a/mise.toml b/mise.toml
index 1a22e00..86da3d2 100644
--- a/mise.toml
+++ b/mise.toml
@@ -1,7 +1,7 @@
 [tools]
 java="temurin-21"
 sbt="1.11.6"
-scala="2.13.18"
+scala="3.9.0"
 
 [env]
 # SBT options for better performance