diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index c4d3319..6f95a43 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -274,7 +274,7 @@ jobs:
       run: cmake -E tar cfv ../../${{ matrix.config.artifact }} --format=zip .
 
     - name: Upload
-      uses: actions/upload-artifact@v3
+      uses: actions/upload-artifact@v4
       with:
         path: ./${{ matrix.config.artifact }}
         name: ${{ matrix.config.artifact }}
@@ -310,7 +310,7 @@ jobs:
       run: |
         echo "${{ steps.create_release.outputs.upload_url }}" > ./upload_url
 
-    - uses: actions/upload-artifact@v3
+    - uses: actions/upload-artifact@v4
       with:
         path: ./upload_url
         name: upload_url
diff --git a/.github/workflows/run-mmcesim.yml b/.github/workflows/run-mmcesim.yml
index 6a416b2..927d00e 100644
--- a/.github/workflows/run-mmcesim.yml
+++ b/.github/workflows/run-mmcesim.yml
@@ -19,7 +19,7 @@ jobs:
       - name: Check Contents
         run: cat "${{ steps.run.outputs.src }}"
       - name: Upload
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: "Run mmCEsim Action"
           path: "${{ steps.run.outputs.src }}"