diff --git a/.github/workflows/zz-defaultbackend.yml b/.github/workflows/zz-defaultbackend.yml
old mode 100755
new mode 100644
index 0998b7d..7d532fb
--- a/.github/workflows/zz-defaultbackend.yml
+++ b/.github/workflows/zz-defaultbackend.yml
@@ -17,7 +17,7 @@ jobs:
     steps:
     - uses: actions/checkout@v2
     - uses: docker/setup-qemu-action@v1
-    - uses: docker/setup-buildx-action@v1
+    - uses: docker/setup-buildx-action@v1.3.0
       with:
         driver-opts: network=host
     - uses: docker/login-action@v1
diff --git a/.github/workflows/zz-heapster.yml b/.github/workflows/zz-heapster.yml
old mode 100755
new mode 100644
index 658733f..6d68f81
--- a/.github/workflows/zz-heapster.yml
+++ b/.github/workflows/zz-heapster.yml
@@ -17,7 +17,7 @@ jobs:
     steps:
     - uses: actions/checkout@v2
     - uses: docker/setup-qemu-action@v1
-    - uses: docker/setup-buildx-action@v1
+    - uses: docker/setup-buildx-action@v1.3.0
       with:
         driver-opts: network=host
     - uses: docker/login-action@v1