diff --git a/.github/workflows/publish-tag.yml b/.github/workflows/publish-tag.yml
index 4a1a7c34..bc73d697 100644
--- a/.github/workflows/publish-tag.yml
+++ b/.github/workflows/publish-tag.yml
@@ -15,11 +15,11 @@ jobs:
       - name: Checkout latest code
         uses: actions/checkout@v2
 
-      - name: Set up JDK 17
+      - name: Set up JDK 21
         uses: actions/setup-java@v2
         with:
           distribution: 'temurin'
-          java-version: 17
+          java-version: 21
 
       - name: Change wrapper permissions
         run: chmod +x ./gradlew
diff --git a/build.gradle.kts b/build.gradle.kts
index e42c3ff0..716fb8bd 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -64,7 +64,7 @@ allprojects {
 
         compileKotlin {
             kotlinOptions {
-                jvmTarget = "17"
+                jvmTarget = "21"
             }
         }
 
@@ -90,7 +90,7 @@ allprojects {
         }
 
         withType<JavaCompile>().configureEach {
-            options.release = 17
+            options.release = 21
         }
     }
 
@@ -101,10 +101,3 @@ allprojects {
         }
     }
 }
-
-// Root is Java 21 to support 1.20.6+, rest use Java 17
-java {
-    sourceCompatibility = JavaVersion.VERSION_21
-    targetCompatibility = JavaVersion.VERSION_21
-    withSourcesJar()
-}
diff --git a/eco-core/core-nms/v1_21/build.gradle.kts b/eco-core/core-nms/v1_21/build.gradle.kts
index 118e82d2..9fe838c4 100644
--- a/eco-core/core-nms/v1_21/build.gradle.kts
+++ b/eco-core/core-nms/v1_21/build.gradle.kts
@@ -13,14 +13,4 @@ tasks {
     build {
         dependsOn(reobfJar)
     }
-
-    compileJava {
-        options.release = 21
-    }
-
-    compileKotlin {
-        kotlinOptions {
-            jvmTarget = "21"
-        }
-    }
 }
diff --git a/jitpack.yml b/jitpack.yml
deleted file mode 100644
index caba981a..00000000
--- a/jitpack.yml
+++ /dev/null
@@ -1,6 +0,0 @@
-jdk: openjdk17
-before_install:
-  - source "$HOME/.sdkman/bin/sdkman-init.sh"
-  - sdk update
-  - sdk install java 17.0.1-tem
-  - sdk use java 17.0.1-tem
\ No newline at end of file