diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 29b3905..9dbb443 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -37,7 +37,7 @@ jobs:
         run: cp target/plantuml.war target/plantuml-jsp-${{ steps.version.outputs.VERSION }}.war
 
       - name: temporarily save generated war files
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: war-jre11
           path: target/plantuml*-${{ steps.version.outputs.VERSION }}.war
@@ -76,7 +76,7 @@ jobs:
         run: cp target/plantuml.war target/plantuml-jre8-jsp-${{ steps.version.outputs.VERSION }}.war
 
       - name: temporarily save generated war files
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: war-jre8
           path: target/plantuml*-${{ steps.version.outputs.VERSION }}.war
diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index e6f4773..f68088b 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -29,7 +29,7 @@ jobs:
         run: mvn --batch-mode -f pom.jdk8.xml -D java.net.useSystemProxies=true clean package
 
       - name: temporarily save generated files
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: war-jre8
           path: target/plantuml.war