diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 94d1c3f..b94036b 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -17,9 +17,9 @@ jobs:
     name: Java ${{ matrix.Java }}
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - name: Setup java
-        uses: actions/setup-java@v2
+        uses: actions/setup-java@v4
         with:
           distribution: 'adopt'
           java-version: ${{ matrix.java }}
@@ -30,7 +30,7 @@ jobs:
         
       - name: Upload Unit Test Results And Specification
         if: always()
-        uses: actions/upload-artifact@v2
+        uses: actions/upload-artifact@v4
         with:
           name: reports-java-${{ matrix.java }}
           path: |
@@ -46,17 +46,17 @@ jobs:
 
     steps:
       - name: Download Artifacts
-        uses: actions/download-artifact@v4.1.7
+        uses: actions/download-artifact@v4
         with:
           path: artifacts
           
       - name: Publish Unit Test Results
-        uses: EnricoMi/publish-unit-test-result-action@v1
+        uses: EnricoMi/publish-unit-test-result-action@v2
         with:
           files: artifacts/**/test-results/**/*.xml
           
       - name: Publish Specifications
-        uses: peaceiris/actions-gh-pages@v3
+        uses: peaceiris/actions-gh-pages@v4
         with:
           deploy_key: ${{ secrets.ACTIONS_DEPLOY_KEY }}
           external_repository: concordion/concordion-specifications
diff --git a/.gitignore b/.gitignore
index f260970..2e9d4f4 100644
--- a/.gitignore
+++ b/.gitignore
@@ -20,4 +20,7 @@ out/
 .vscode/
 
 # Infer
-infer-out/
\ No newline at end of file
+infer-out/
+
+# ASDF
+.tool-versions
\ No newline at end of file
diff --git a/gradle.properties b/gradle.properties
index 03ddc26..2a61825 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -1,2 +1,2 @@
-version=2.1.5-SNAPSHOT
+version=2.1.5
 systemProp.javax.net.ssl.trustStore=cacerts