diff --git a/.github/workflows/java-autoformat.yml b/.github/workflows/java-autoformat.yml
index 0a2f42112..7aa2487cb 100644
--- a/.github/workflows/java-autoformat.yml
+++ b/.github/workflows/java-autoformat.yml
@@ -11,10 +11,11 @@ jobs:
         with:
           ref: ${{ github.head_ref }}
 
-      - name: Set up JDK 11
+      - name: Set up JDK 21
         uses: actions/setup-java@v1
         with:
-          java-version: 11
+          java-version: 21
+          distribution: temurin
 
       - name: Grant execute permission for gradlew
         run: chmod +x gradlew
diff --git a/build.gradle b/build.gradle
index 445a7f8ea..75a2ec77e 100644
--- a/build.gradle
+++ b/build.gradle
@@ -10,7 +10,7 @@ version '5.3.2'
 apply plugin: 'java'
 apply plugin: 'application'
 
-spotless{
+spotless {
     enforceCheck false
 
     format 'misc', {
@@ -23,7 +23,7 @@ spotless{
         endWithNewline()
     }
 
-    java{
+    java {
         // Use the default importOrder configuration
         importOrder()
 
@@ -38,9 +38,14 @@ spotless{
 
 apply plugin: 'checkstyle'
 
-mainClassName = 'edu.rpi.legup.Legup'
+application {
+    mainClass.set('edu.rpi.legup.Legup')
+}
 
-sourceCompatibility = 21
+java {
+    sourceCompatibility = JavaVersion.VERSION_21
+    targetCompatibility = JavaVersion.VERSION_21
+}
 
 dependencies {
     implementation 'org.jetbrains:annotations:20.1.0'
@@ -133,11 +138,9 @@ task buildNativeWindows(type: Exec, dependsOn: 'createExe') {
     commandLine 'cmd', '/c', 'make_windows_installer.bat'
 }
 
-
 repositories {
     mavenCentral()
 }
-targetCompatibility = JavaVersion.VERSION_21
 
 tasks.register("jpackage") {
     group("jpackage")
@@ -168,4 +171,4 @@ tasks.register('copyInstaller', Sync) {
     rename("LEGUP-${project.version}", "LEGUP-installer-${project.version}")
 }
 
-copyInstaller.dependsOn(jpackage)
\ No newline at end of file
+copyInstaller.dependsOn(jpackage)
diff --git a/src/main/java/edu/rpi/legup/puzzle/shorttruthtable/rules/caserule/CaseRule_Generic.java b/src/main/java/edu/rpi/legup/puzzle/shorttruthtable/rules/caserule/CaseRule_Generic.java
index 600a9898d..5885f98f8 100644
--- a/src/main/java/edu/rpi/legup/puzzle/shorttruthtable/rules/caserule/CaseRule_Generic.java
+++ b/src/main/java/edu/rpi/legup/puzzle/shorttruthtable/rules/caserule/CaseRule_Generic.java
@@ -60,4 +60,4 @@ public String checkRuleRaw(TreeTransition transition) {
     public String checkRuleRawAt(TreeTransition transition, PuzzleElement puzzleElement) {
         return checkRuleRaw(transition);
     }
-}
\ No newline at end of file
+}