diff --git a/.github/workflows/linux.yml b/.github/workflows/linux.yml
index 57605960..65a50752 100644
--- a/.github/workflows/linux.yml
+++ b/.github/workflows/linux.yml
@@ -17,9 +17,9 @@ jobs:
         rust_toolchain: [stable, beta]
     runs-on: ${{ matrix.os }}
     steps:
-    - uses: actions/checkout@v1
+    - uses: actions/checkout@50fbc622fc4ef5163becd7fab6573eac35f8462e # v1.2.0
     - name: Install Rust
-      uses: actions-rs/toolchain@v1
+      uses: actions-rs/toolchain@16499b5e05bf2e26879000db0c1d13f7e13fa3af # v1.0.7
       with:
         profile: minimal
         toolchain: ${{ matrix.rust_toolchain }}
diff --git a/.github/workflows/macos.yml b/.github/workflows/macos.yml
index a34f289b..092c0115 100644
--- a/.github/workflows/macos.yml
+++ b/.github/workflows/macos.yml
@@ -16,9 +16,9 @@ jobs:
         os: [macos-10.14]
     runs-on: ${{ matrix.os }}
     steps:
-    - uses: actions/checkout@v1
+    - uses: actions/checkout@50fbc622fc4ef5163becd7fab6573eac35f8462e # v1.2.0
     - name: Install Rust
-      uses: actions-rs/toolchain@v1
+      uses: actions-rs/toolchain@16499b5e05bf2e26879000db0c1d13f7e13fa3af # v1.0.7
       with:
         profile: minimal
         toolchain: stable
diff --git a/.github/workflows/windows.yml b/.github/workflows/windows.yml
index 871590a2..9cbb1d85 100644
--- a/.github/workflows/windows.yml
+++ b/.github/workflows/windows.yml
@@ -19,9 +19,9 @@ jobs:
         - TARGET: i686-pc-windows-msvc
     runs-on: ${{ matrix.os }}
     steps:
-    - uses: actions/checkout@v1
+    - uses: actions/checkout@50fbc622fc4ef5163becd7fab6573eac35f8462e # v1.2.0
     - name: Install Rust
-      uses: actions-rs/toolchain@v1
+      uses: actions-rs/toolchain@16499b5e05bf2e26879000db0c1d13f7e13fa3af # v1.0.7
       with:
         profile: minimal
         toolchain: stable