diff --git a/.github/workflows/build-on-pull-request.yml b/.github/workflows/build-on-pull-request.yml
index 1064776cf..146964a30 100644
--- a/.github/workflows/build-on-pull-request.yml
+++ b/.github/workflows/build-on-pull-request.yml
@@ -44,7 +44,7 @@ jobs:
         shell: bash
         run: make -j2 doc
       - name: Upload a documents snapshot.
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: docs
           path: ./html
diff --git a/.github/workflows/snapshot-on-push-master.yml b/.github/workflows/snapshot-on-push-master.yml
index f66b1a745..d58bff8ed 100644
--- a/.github/workflows/snapshot-on-push-master.yml
+++ b/.github/workflows/snapshot-on-push-master.yml
@@ -86,12 +86,12 @@ jobs:
           mv cc65.zip cc65-snapshot-win32.zip
 
       - name: Upload a 32-bit Snapshot Zip
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: cc65-snapshot-win32
           path: cc65-snapshot-win32.zip
       - name: Upload a 64-bit Snapshot Zip
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: cc65-snapshot-win64
           path: cc65-snapshot-win64.zip
@@ -120,7 +120,7 @@ jobs:
       - name: Package offline documents.
         run: 7z a cc65-snapshot-docs.zip ./html/*.*
       - name: Upload a Documents Snapshot Zip
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: cc65-snapshot-docs
           path: cc65-snapshot-docs.zip
diff --git a/.github/workflows/windows-test-scheduled.yml b/.github/workflows/windows-test-scheduled.yml
index 25f0d3e50..f72254273 100644
--- a/.github/workflows/windows-test-scheduled.yml
+++ b/.github/workflows/windows-test-scheduled.yml
@@ -30,7 +30,7 @@ jobs:
         run: mkdir ~/.cache-sha
 
       - name: Cache SHA
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         id: check-sha
         with:
           path: ~/.cache-sha