diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 31afc209..e9e99d15 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -27,7 +27,7 @@ jobs:
     name: 🛠️ Build
     runs-on: windows-latest
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4.3.1
       with:
         fetch-depth: 0
     - name: ⚙️ Install prerequisites
@@ -47,7 +47,7 @@ jobs:
     needs: build
     runs-on: windows-latest
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4.3.1
       with:
         fetch-depth: 0
     - name: ⚙️ Install prerequisites
@@ -79,7 +79,7 @@ jobs:
     name: 🧪 Tests (Linux)
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4.3.1
       with:
         fetch-depth: 0
     - name: ⚙️ Install prerequisites
@@ -144,7 +144,7 @@ jobs:
             filter: "TestCategory=HighMemory&TestShard!=FastMethods&TestShard!=EverythingModern&TestShard!=EverythingLegacy&TestShard!=FullGen-Net8&TestShard!=FullGen-Net9&TestShard!=FullGen-Net9-Ptrs"
             threads: "1"
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4.3.1
       with:
         fetch-depth: 0
     - name: ⚙️ Install prerequisites
@@ -187,7 +187,7 @@ jobs:
     needs: build
     runs-on: windows-latest
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4.3.1
       with:
         fetch-depth: 1
     - name: ⚙️ Install prerequisites