diff --git a/.forgejo/actions/rust-toolchain/action.yml b/.forgejo/actions/rust-toolchain/action.yml
index b16869d91..bb413d64a 100644
--- a/.forgejo/actions/rust-toolchain/action.yml
+++ b/.forgejo/actions/rust-toolchain/action.yml
@@ -33,7 +33,7 @@ runs:
         echo "version=$(rustup --version)" >> $GITHUB_OUTPUT
     - name: Cache rustup toolchains
       if: steps.rustup-version.outputs.version == ''
-      uses: actions/cache@v5
+      uses: actions/cache@27d5ce7f107fe9357f9df03efb73ab90386fccae # v5
       with:
         path: |
           ~/.rustup
diff --git a/.forgejo/actions/setup-llvm-with-apt/action.yml b/.forgejo/actions/setup-llvm-with-apt/action.yml
index 5b649fc20..f188e1280 100644
--- a/.forgejo/actions/setup-llvm-with-apt/action.yml
+++ b/.forgejo/actions/setup-llvm-with-apt/action.yml
@@ -57,7 +57,7 @@ runs:
 
     - name: Check for LLVM cache
       id: cache
-      uses: actions/cache@v5
+      uses: actions/cache@27d5ce7f107fe9357f9df03efb73ab90386fccae # v5
       with:
         path: |
           /usr/bin/clang-*
diff --git a/.forgejo/actions/setup-rust/action.yml b/.forgejo/actions/setup-rust/action.yml
index 252e74d9b..e15b926ac 100644
--- a/.forgejo/actions/setup-rust/action.yml
+++ b/.forgejo/actions/setup-rust/action.yml
@@ -65,7 +65,7 @@ runs:
 
     - name: Cache toolchain binaries
       id: toolchain-cache
-      uses: actions/cache@v5
+      uses: actions/cache@27d5ce7f107fe9357f9df03efb73ab90386fccae # v5
       with:
         path: |
           .cargo/bin
@@ -76,7 +76,7 @@ runs:
 
     - name: Cache Cargo registry and git
       id: registry-cache
-      uses: actions/cache@v5
+      uses: actions/cache@27d5ce7f107fe9357f9df03efb73ab90386fccae # v5
       with:
         path: |
           .cargo/registry/index
diff --git a/.forgejo/actions/timelord/action.yml b/.forgejo/actions/timelord/action.yml
index d0df5cd76..4d4f22967 100644
--- a/.forgejo/actions/timelord/action.yml
+++ b/.forgejo/actions/timelord/action.yml
@@ -31,7 +31,7 @@ runs:
 
     - name: Restore binary cache
       id: binary-cache
-      uses: actions/cache/restore@v5
+      uses: actions/cache/restore@27d5ce7f107fe9357f9df03efb73ab90386fccae # v5
       with:
         path: |
           /usr/share/rust/.cargo/bin
@@ -77,7 +77,7 @@ runs:
 
     - name: Save binary cache
       if: steps.check-binaries.outputs.need-install == 'true'
-      uses: actions/cache/save@v5
+      uses: actions/cache/save@27d5ce7f107fe9357f9df03efb73ab90386fccae # v5
       with:
         path: |
           /usr/share/rust/.cargo/bin
@@ -87,7 +87,7 @@ runs:
 
     - name: Restore timelord cache with fallbacks
       id: timelord-restore
-      uses: actions/cache/restore@v5
+      uses: actions/cache/restore@27d5ce7f107fe9357f9df03efb73ab90386fccae # v5
       with:
         path: ${{ env.TIMELORD_CACHE_PATH }}
         key: ${{ env.TIMELORD_KEY }}
@@ -114,7 +114,7 @@ runs:
         timelord sync --source-dir ${{ env.TIMELORD_PATH }} --cache-dir ${{ env.TIMELORD_CACHE_PATH }}
 
     - name: Save updated timelord cache immediately
-      uses: actions/cache/save@v5
+      uses: actions/cache/save@27d5ce7f107fe9357f9df03efb73ab90386fccae # v5
       with:
         path: ${{ env.TIMELORD_CACHE_PATH }}
         key: ${{ env.TIMELORD_KEY }}
diff --git a/.forgejo/workflows/build-debian.yml b/.forgejo/workflows/build-debian.yml
index cf2f760df..69a2e0508 100644
--- a/.forgejo/workflows/build-debian.yml
+++ b/.forgejo/workflows/build-debian.yml
@@ -60,7 +60,7 @@ jobs:
           ref: ${{ github.ref_name }}
 
       - name: Cache Cargo registry
-        uses: actions/cache@v5
+        uses: actions/cache@27d5ce7f107fe9357f9df03efb73ab90386fccae # v5
         with:
           path: |
             ~/.cargo/registry
diff --git a/.forgejo/workflows/build-fedora.yml b/.forgejo/workflows/build-fedora.yml
index 3b09a1ffd..589a9cb74 100644
--- a/.forgejo/workflows/build-fedora.yml
+++ b/.forgejo/workflows/build-fedora.yml
@@ -37,7 +37,7 @@ jobs:
 
 
       - name: Cache DNF packages
-        uses: actions/cache@v5
+        uses: actions/cache@27d5ce7f107fe9357f9df03efb73ab90386fccae # v5
         with:
           path: |
             /var/cache/dnf
@@ -47,7 +47,7 @@ jobs:
             dnf-fedora${{ steps.fedora.outputs.version }}-
 
       - name: Cache Cargo registry
-        uses: actions/cache@v5
+        uses: actions/cache@27d5ce7f107fe9357f9df03efb73ab90386fccae # v5
         with:
           path: |
             ~/.cargo/registry
@@ -57,7 +57,7 @@ jobs:
             cargo-fedora${{ steps.fedora.outputs.version }}-
 
       - name: Cache Rust build dependencies
-        uses: actions/cache@v5
+        uses: actions/cache@27d5ce7f107fe9357f9df03efb73ab90386fccae # v5
         with:
           path: |
             ~/rpmbuild/BUILD/*/target/release/deps
diff --git a/.forgejo/workflows/documentation.yml b/.forgejo/workflows/documentation.yml
index c3fded067..e0cc996bf 100644
--- a/.forgejo/workflows/documentation.yml
+++ b/.forgejo/workflows/documentation.yml
@@ -37,7 +37,7 @@ jobs:
           node-version: 22
 
       - name: Cache npm dependencies
-        uses: actions/cache@v5
+        uses: actions/cache@27d5ce7f107fe9357f9df03efb73ab90386fccae # v5
         with:
           path: ~/.npm
           key: continuwuity-rspress-${{ steps.runner-env.outputs.slug }}-${{ steps.runner-env.outputs.arch }}-node-${{ steps.runner-env.outputs.node_version }}-${{ hashFiles('package-lock.json') }}
diff --git a/.forgejo/workflows/renovate.yml b/.forgejo/workflows/renovate.yml
index ea3886e5d..8bd2b7ccd 100644
--- a/.forgejo/workflows/renovate.yml
+++ b/.forgejo/workflows/renovate.yml
@@ -55,7 +55,7 @@ jobs:
         run: /usr/local/renovate/node -e 'console.log(`node heap limit = ${require("v8").getHeapStatistics().heap_size_limit / (1024 * 1024)} Mb`)'
 
       - name: Restore renovate repo cache
-        uses: actions/cache/restore@v5
+        uses: actions/cache/restore@27d5ce7f107fe9357f9df03efb73ab90386fccae # v5
         with:
           path: |
             /tmp/renovate/cache/renovate/repository
@@ -64,7 +64,7 @@ jobs:
             renovate-repo-cache-
 
       - name: Restore renovate package cache
-        uses: actions/cache/restore@v5
+        uses: actions/cache/restore@27d5ce7f107fe9357f9df03efb73ab90386fccae # v5
         with:
           path: |
             /tmp/renovate/cache/renovate/renovate-cache-sqlite
@@ -73,7 +73,7 @@ jobs:
             renovate-package-cache-
 
       - name: Restore renovate OSV cache
-        uses: actions/cache/restore@v5
+        uses: actions/cache/restore@27d5ce7f107fe9357f9df03efb73ab90386fccae # v5
         with:
           path: |
             /tmp/osv
@@ -117,7 +117,7 @@ jobs:
 
       - name: Save renovate package cache
         if: always()
-        uses: actions/cache/save@v5
+        uses: actions/cache/save@27d5ce7f107fe9357f9df03efb73ab90386fccae # v5
         with:
           path: |
             /tmp/renovate/cache/renovate/renovate-cache-sqlite
@@ -125,7 +125,7 @@ jobs:
 
       - name: Save renovate OSV cache
         if: always()
-        uses: actions/cache/save@v5
+        uses: actions/cache/save@27d5ce7f107fe9357f9df03efb73ab90386fccae # v5
         with:
           path: |
             /tmp/osv