diff --git a/.github/workflows/04-android-build.yml b/.github/workflows/04-android-build.yml
index a9426b0..aa44084 100644
--- a/.github/workflows/04-android-build.yml
+++ b/.github/workflows/04-android-build.yml
@@ -73,7 +73,7 @@ jobs:
 
       # ── Step 1: build host protoc (using HOST compiler, NOT NDK) ───────
       - name: Cache host protoc
-        uses: actions/cache@v5
+        uses: actions/cache@v6
         with:
           path: build_host
           key: ${{ runner.os }}-host-protoc-${{ hashFiles('thirdparty/protobuf/**', 'CMakeLists.txt') }}
diff --git a/.github/workflows/06-ios-build.yml b/.github/workflows/06-ios-build.yml
index f9ecb06..98a444f 100644
--- a/.github/workflows/06-ios-build.yml
+++ b/.github/workflows/06-ios-build.yml
@@ -38,7 +38,7 @@ jobs:
           max-size: 150M
 
       - name: Cache host protoc build
-        uses: actions/cache@v5
+        uses: actions/cache@v6
         with:
           path: build_host
           key: macos-host-protoc-${{ hashFiles('thirdparty/protobuf/**', 'CMakeLists.txt') }}
diff --git a/.github/workflows/07-linux-riscv-build.yml b/.github/workflows/07-linux-riscv-build.yml
index 70f24f5..a1612fd 100644
--- a/.github/workflows/07-linux-riscv-build.yml
+++ b/.github/workflows/07-linux-riscv-build.yml
@@ -165,7 +165,7 @@ jobs:
         shell: bash
 
       - name: Cache pip
-        uses: actions/cache@v5
+        uses: actions/cache@v6
         with:
           path: ~/.cache/pip
           key: linux-riscv64-${{ runner.os }}-pip-${{ hashFiles('pyproject.toml') }}
diff --git a/.github/workflows/clang_tidy.yml b/.github/workflows/clang_tidy.yml
index 03a1b48..20a302d 100644
--- a/.github/workflows/clang_tidy.yml
+++ b/.github/workflows/clang_tidy.yml
@@ -129,7 +129,7 @@ jobs:
       - name: Restore generated headers cache
         id: cache_headers
         if: steps.changed_files.outputs.any_changed == 'true'
-        uses: actions/cache/restore@v5
+        uses: actions/cache/restore@v6
         with:
           path: |
             build/external
@@ -144,7 +144,7 @@ jobs:
 
       - name: Save generated headers cache
         if: steps.tidy_files.outputs.any_tidy_files == 'true' && steps.cache_headers.outputs.cache-hit != 'true'
-        uses: actions/cache/save@v5
+        uses: actions/cache/save@v6
         with:
           path: |
             build/external