diff --git a/.github/workflows/CI.yml b/.github/workflows/CI.yml
index 772e56a..107a160 100644
--- a/.github/workflows/CI.yml
+++ b/.github/workflows/CI.yml
@@ -18,7 +18,7 @@ jobs:
       fail-fast: false
     runs-on: ${{ matrix.os }}
     steps:
-    - uses: actions/checkout@v1
+    - uses: actions/checkout@v2.3.4
     - uses: UziTech/action-setup-atom@v1
       with:
         channel: ${{ matrix.channel }}
@@ -37,7 +37,7 @@ jobs:
     if: "!contains(github.event.head_commit.message, '[skip ci]')"
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v1
+      - uses: actions/checkout@v2.3.4
       - uses: actions/setup-node@v1
         with:
           node-version: '12.x'
@@ -53,7 +53,7 @@ jobs:
       github.event.repository.fork == false
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v1
+      - uses: actions/checkout@v2.3.4
       - uses: UziTech/action-setup-atom@v1
       - uses: actions/setup-node@v1
         with:
diff --git a/.github/workflows/codeql-analysis.yml b/.github/workflows/codeql-analysis.yml
index 1631cfa..97bac7e 100644
--- a/.github/workflows/codeql-analysis.yml
+++ b/.github/workflows/codeql-analysis.yml
@@ -35,7 +35,7 @@ jobs:
 
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v2
+      uses: actions/checkout@v2.3.4
 
     # Initializes the CodeQL tools for scanning.
     - name: Initialize CodeQL