diff --git a/.github/workflows/Semgrep.yml b/.github/workflows/Semgrep.yml
index 74e528b..9d16b46 100644
--- a/.github/workflows/Semgrep.yml
+++ b/.github/workflows/Semgrep.yml
@@ -24,18 +24,18 @@ jobs:
     steps:
         # Checkout the repository.
       - name: Clone source code
-        uses: actions/checkout@v6
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
 
         # Checkout custom rules
       - name: Checkout custom rules
-        uses: actions/checkout@v6
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
         with:
           repository: JuliaComputing/semgrep-rules-julia
           ref: main
           path: ./JuliaRules
 
         # Prepare Python
-      - uses: actions/setup-python@v6
+      - uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405 # v6.2.0
         with:
           python-version: '3.10'
 
@@ -54,13 +54,13 @@ jobs:
                 --exclude=JuliaRules
     
       - name: Save Semgrep report
-        uses: actions/upload-artifact@v7
+        uses: actions/upload-artifact@bbbca2ddaa5d8feaa63e36b76fdaad77386f024f # v7.0.0
         with:
           name: report.sarif
           path: report.sarif
       
       - name: Upload Semgrep report
-        uses: github/codeql-action/upload-sarif@v4
+        uses: github/codeql-action/upload-sarif@4e94bd11f71e507f7f87df81788dff88d1dacbfb # v4.34.1
         with:
           sarif_file: report.sarif
           category: semgrep
\ No newline at end of file
diff --git a/.github/workflows/TagBot.yml b/.github/workflows/TagBot.yml
index f49313b..df4c9d1 100644
--- a/.github/workflows/TagBot.yml
+++ b/.github/workflows/TagBot.yml
@@ -9,7 +9,7 @@ jobs:
     if: github.event_name == 'workflow_dispatch' || github.actor == 'JuliaTagBot'
     runs-on: ubuntu-latest
     steps:
-      - uses: JuliaRegistries/TagBot@v1
+      - uses: JuliaRegistries/TagBot@bdfeaa1ff40e0ea449f9539aa21b2e587431ed49 # v1.24.6
         with:
           token: ${{ secrets.GITHUB_TOKEN }}
           ssh: ${{ secrets.DOCUMENTER_KEY }}
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 3d3f441..e4a9641 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -23,12 +23,12 @@ jobs:
         arch:
           - x64
     steps:
-      - uses: actions/checkout@v6
-      - uses: julia-actions/setup-julia@v2
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+      - uses: julia-actions/setup-julia@4c0cb0fce8556fdb04a90347310e5db8b1f98fb9 # v2.7.0
         with:
           version: ${{ matrix.version }}
           arch: ${{ matrix.arch }}
-      - uses: actions/cache@v5
+      - uses: actions/cache@668228422ae6a00e4ad889ee87cd7109ec5666a7 # v5.0.4
         env:
           cache-name: cache-artifacts
         with:
@@ -38,10 +38,10 @@ jobs:
             ${{ runner.os }}-test-${{ env.cache-name }}-
             ${{ runner.os }}-test-
             ${{ runner.os }}-
-      - uses: julia-actions/julia-buildpkg@v1
-      - uses: julia-actions/julia-runtest@v1
-      - uses: julia-actions/julia-processcoverage@v1
-      - uses: codecov/codecov-action@v5
+      - uses: julia-actions/julia-buildpkg@e3eb439fad4f9aba7da2667e7510e4a46ebc46e1 # v1.7.0
+      - uses: julia-actions/julia-runtest@d60b785c6f2bdf4ebfb18b2b6f7d93b7dfb0efe3 # v1.11.4
+      - uses: julia-actions/julia-processcoverage@03114f09f119417c3242a9fb6e0b722676aedf38 # v1.2.2
+      - uses: codecov/codecov-action@1af58845a975a7985b0beb0cbe6fbbb71a41dbad # v5.5.3
         env:
           CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}
         with:
@@ -50,8 +50,8 @@ jobs:
     name: Documentation
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v6
-      - uses: julia-actions/setup-julia@v2
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+      - uses: julia-actions/setup-julia@4c0cb0fce8556fdb04a90347310e5db8b1f98fb9 # v2.7.0
         with:
           version: '1'
       - run: |