diff --git a/.github/workflows/gradle.yml b/.github/workflows/gradle.yml
index 4ea6448..49333c5 100644
--- a/.github/workflows/gradle.yml
+++ b/.github/workflows/gradle.yml
@@ -22,11 +22,11 @@ jobs:
 
     steps:
     - uses: actions/checkout@v4
-    - name: Set up JDK 22
+    - name: Set up JDK 21
       uses: actions/setup-java@v4
       with:
-        java-version: '22'
-        distribution: 'oracle'
+        java-version: '21.0.3'
+        distribution: 'temurin'
 
     # Configure Gradle for optimal use in GiHub Actions, including caching of downloaded dependencies.
     # See: https://github.com/gradle/actions/blob/main/setup-gradle/README.md
@@ -58,11 +58,11 @@ jobs:
 
     steps:
     - uses: actions/checkout@v4
-    - name: Set up JDK 20
+    - name: Set up JDK 21
       uses: actions/setup-java@v4
       with:
-        java-version: '22'
-        distribution: 'oracle'
+        java-version: '21.0.3'
+        distribution: 'temurin'
 
     # Generates and submits a dependency graph, enabling Dependabot Alerts for all project dependencies.
     # See: https://github.com/gradle/actions/blob/main/dependency-submission/README.md
diff --git a/build.gradle b/build.gradle
index dbf5913..996a8a4 100644
--- a/build.gradle
+++ b/build.gradle
@@ -12,7 +12,7 @@ repositories {
 }
 
 javafx {
-    version = '22.0.1'
+    version = '21.0.3'
     modules = ['javafx.controls', 'javafx.media']
 }