diff --git a/.github/workflows/default.yml b/.github/workflows/default.yml
index 13fe262f..9a447ac5 100644
--- a/.github/workflows/default.yml
+++ b/.github/workflows/default.yml
@@ -23,7 +23,7 @@ jobs:
       - uses: actions/setup-java@v4
         with:
           distribution: 'temurin'
-          java-version: 20
+          java-version: 21
 
       - name: Write Gradle build properties to `~/.gradle/gradle.properties`
         run: |
@@ -86,11 +86,11 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        javaVersion: [ 17, 20 ]
+        javaVersion: [ 17, 21 ]
         gradle: [ release-candidate ]
         agp: ${{ fromJSON(needs.provide-agp-version-matrix.outputs.agp-versions) }}
         include:
-          - javaVersion: 11
+          - javaVersion: 17
             gradle: "8.0"
             agp: 8.0.0
           - javaVersion: 17
@@ -134,7 +134,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        javaVersion: [ 17, 20 ]
+        javaVersion: [ 17, 21 ]
         os: [ ubuntu-latest, windows-latest, macos-latest ]
 
     steps:
@@ -174,7 +174,7 @@ jobs:
       - uses: actions/setup-java@v4
         with:
           distribution: 'temurin'
-          java-version: 20
+          java-version: 21
 
       - name: Write Gradle build properties to `~/.gradle/gradle.properties`
         run: |
diff --git a/.github/workflows/dependency_diff.yml b/.github/workflows/dependency_diff.yml
index 8df4176a..e1345834 100644
--- a/.github/workflows/dependency_diff.yml
+++ b/.github/workflows/dependency_diff.yml
@@ -15,7 +15,7 @@ jobs:
       - uses: actions/setup-java@v4
         with:
           distribution: 'temurin'
-          java-version: 20
+          java-version: 21
 
       - name: Write Gradle build properties to `~/.gradle/gradle.properties`
         run: |
diff --git a/.github/workflows/publish_release.yml b/.github/workflows/publish_release.yml
index 90cba0b5..4b231ddc 100644
--- a/.github/workflows/publish_release.yml
+++ b/.github/workflows/publish_release.yml
@@ -17,7 +17,7 @@ jobs:
       - uses: actions/setup-java@v4
         with:
           distribution: 'temurin'
-          java-version: 20
+          java-version: 21
 
       - name: Write Gradle build properties to `~/.gradle/gradle.properties`
         run: |
diff --git a/easylauncher/build.gradle b/easylauncher/build.gradle
index 10c63723..53ecba07 100644
--- a/easylauncher/build.gradle
+++ b/easylauncher/build.gradle
@@ -49,7 +49,7 @@ tasks.withType(KotlinCompile).configureEach {
     }
 }
 kotlin {
-    jvmToolchain(20)
+    jvmToolchain(21)
 }
 
 dependencies {
diff --git a/gradle/plugins/build.gradle b/gradle/plugins/build.gradle
index 697eb3dc..6a386c8c 100644
--- a/gradle/plugins/build.gradle
+++ b/gradle/plugins/build.gradle
@@ -22,7 +22,7 @@ dependencies {
 }
 
 kotlin {
-    jvmToolchain(20)
+    jvmToolchain(21)
 }
 
 gradlePlugin {