diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index bd3586c..f727012 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -16,8 +16,8 @@ jobs:
     name: Build stubs + build all variants (smoke)
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v6
-      - uses: jdx/mise-action@v3
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
+      - uses: jdx/mise-action@5228313ee0372e111a38da051671ca30fc5a96db # v3
 
       - name: Sanity check
         run: | 
@@ -38,7 +38,7 @@ jobs:
           tar -czf build.tgz build
 
       - name: Upload build artifact
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@ea165f8d65b6e75b540449e92b4886f43607fa02 # v4
         with:
           name: build-tgz
           path: build.tgz
@@ -91,10 +91,10 @@ jobs:
             output: ./build/jpaxa-output/jpaxa-windows-x86_64.exe verify
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
 
       - name: Download build
-        uses: actions/download-artifact@v4
+        uses: actions/download-artifact@d3f86a106a0bac45b974a628896c90dbdf5c8093 # v4
         with:
           name: build-tgz
           path: .