diff --git a/.github/workflows/go.yml b/.github/workflows/go.yml
index f337126..790db7a 100644
--- a/.github/workflows/go.yml
+++ b/.github/workflows/go.yml
@@ -28,7 +28,7 @@ jobs:
           go-version: ^1.13
 
       - name: Check out code into the Go module directory
-        uses: actions/checkout@v2
+        uses: actions/checkout@v2.3.4
 
       - name: Setup protoc
         uses: arduino/setup-protoc@v1.1.2
diff --git a/.github/workflows/node.js.yml b/.github/workflows/node.js.yml
index 2a1fce9..d077886 100644
--- a/.github/workflows/node.js.yml
+++ b/.github/workflows/node.js.yml
@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v2.3.4
 
       - name: Use Node.js v14.x
         uses: actions/setup-node@v2.1.5
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 00d43ff..b38114c 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -9,7 +9,7 @@ jobs:
   release:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v2.3.4
 
       - name: Set up Go 1.x
         uses: actions/setup-go@v2
@@ -22,7 +22,7 @@ jobs:
           node-version: 14.x
 
       - name: Check out code
-        uses: actions/checkout@v2
+        uses: actions/checkout@v2.3.4
 
       - name: Setup protoc
         uses: arduino/setup-protoc@v1.1.2