diff --git a/.github/workflows/windows-ci.yml b/.github/workflows/windows-ci.yml
index cb690ddf..85562da7 100644
--- a/.github/workflows/windows-ci.yml
+++ b/.github/workflows/windows-ci.yml
@@ -40,7 +40,7 @@ jobs:
 
       # Rely on the msys2 GitHub Action to set up the msys2 environment.
       - name: Setup MSYS2
-        uses: msys2/setup-msys2@v2
+        uses: msys2/setup-msys2@27b3aa77f672cb6b3054121cfd80c3d22ceebb1d #v2.20.1
         with:
           msystem: ${{ matrix.msys2_env }}
           update: true
@@ -56,7 +56,7 @@ jobs:
         # text file and will not match the output from xzgrep.
         run: git config --global core.autocrlf false
 
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@8ade135a41bc03ea155e62e844d188df1ea18608 #v4.1.0
 
 
       ########################
@@ -118,7 +118,7 @@ jobs:
       ###############
 
       # Upload the test logs as artifacts if any step has failed.
-      - uses: actions/upload-artifact@v3
+      - uses: actions/upload-artifact@a8a3f3ad30e3422c9c7b888a15615d19a852ae32 #v3.1.3
         if: ${{ failure() }}
         with:
           name: ${{ matrix.msys2_env }} ${{ matrix.build_system }} Test Logs