diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index f5b98a7..570e904 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -12,10 +12,10 @@ jobs:
 
     steps:
       - name: Code auschecken
-        uses: actions/checkout@v4
+        uses: https://github.com/actions/checkout@v4 # <-- Vollständige URL oder github/ Prefix
 
       - name: Java 21 einrichten
-        uses: actions/setup-java@v4
+        uses: https://github.com/actions/setup-java@v4 # <-- Vollständige URL oder github/ Prefix
         with:
           distribution: 'temurin'
           java-version: '21'
diff --git a/build.gradle.kts b/build.gradle.kts
index 594bcaa..46b4549 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -1,6 +1,7 @@
 plugins {
     alias(libs.plugins.kotlin.jvm)
     alias(ktorLibs.plugins.ktor)
+    id("org.jlleitschuh.gradle.ktlint") version "12.1.0"
     kotlin("plugin.serialization") version "2.0.0"
 }