diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 9c2ca6e..8ba50f1 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -8,15 +8,15 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout sources
-        uses: actions/checkout@v4
+        uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4.3.1
 
       - name: Install stable toolchain
-        uses: dtolnay/rust-toolchain@stable
+        uses: dtolnay/rust-toolchain@29eef336d9b2848a0b548edc03f92a220660cdb8 # stable
         with:
           toolchain: stable
 
       - name: Run cargo check
-        uses: actions-rs/cargo@v1
+        uses: actions-rs/cargo@844f36862e911db73fe0815f00a4a2602c279505 # v1.0.3
         with:
           command: check
 
@@ -25,15 +25,15 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout sources
-        uses: actions/checkout@v4
+        uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4.3.1
 
       - name: Install stable toolchain
-        uses: dtolnay/rust-toolchain@stable
+        uses: dtolnay/rust-toolchain@29eef336d9b2848a0b548edc03f92a220660cdb8 # stable
         with:
           toolchain: stable
 
       - name: Run cargo test
-        uses: actions-rs/cargo@v1
+        uses: actions-rs/cargo@844f36862e911db73fe0815f00a4a2602c279505 # v1.0.3
         with:
           command: test
 
@@ -42,21 +42,21 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout sources
-        uses: actions/checkout@v4
+        uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4.3.1
 
       - name: Install stable toolchain
-        uses: dtolnay/rust-toolchain@stable
+        uses: dtolnay/rust-toolchain@29eef336d9b2848a0b548edc03f92a220660cdb8 # stable
         with:
           toolchain: stable
           components: rustfmt, clippy
 
       - name: Run cargo fmt
-        uses: actions-rs/cargo@v1
+        uses: actions-rs/cargo@844f36862e911db73fe0815f00a4a2602c279505 # v1.0.3
         with:
           command: fmt
           args: --all -- --check
 
       - name: Run cargo clippy
-        uses: actions-rs/cargo@v1
+        uses: actions-rs/cargo@844f36862e911db73fe0815f00a4a2602c279505 # v1.0.3
         with:
           command: clippy
diff --git a/.github/workflows/nix-build.yml b/.github/workflows/nix-build.yml
index 2fb2458..e1853d6 100644
--- a/.github/workflows/nix-build.yml
+++ b/.github/workflows/nix-build.yml
@@ -6,8 +6,8 @@ jobs:
   all-targets:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v4
-    - uses: cachix/install-nix-action@v23
+    - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4.3.1
+    - uses: cachix/install-nix-action@6a9a9e84a173d90b3ffb42c5ddaf9ea033fad011 # v23
       with:
         nix_path: nixpkgs=channel:nixos-unstable
     - run: nix-build
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 407ef9a..77400d3 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -24,14 +24,14 @@ jobs:
 
     steps:
     - name: Install stable toolchain
-      uses: dtolnay/rust-toolchain@stable
+      uses: dtolnay/rust-toolchain@29eef336d9b2848a0b548edc03f92a220660cdb8 # stable
       with:
         toolchain: stable
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4.3.1
     - name: Build
       run: cargo build --release --locked
     - name: Upload binaries to release
-      uses: svenstaro/upload-release-action@v2
+      uses: svenstaro/upload-release-action@29e53e917877a24fad85510ded594ab3c9ca12de # 2.11.5
       with:
         repo_token: ${{ secrets.GITHUB_TOKEN }}
         file: target/release/${{ matrix.artifact_name }}