diff --git a/.github/workflows/test-backend.yml b/.github/workflows/test-backend.yml
index b8eb0e2493..198451c0e9 100644
--- a/.github/workflows/test-backend.yml
+++ b/.github/workflows/test-backend.yml
@@ -19,12 +19,6 @@ on:
       - .github/workflows/test-backend.yml
       - .github/misskey/test.yml
   workflow_dispatch:
-    inputs:
-      force_ffmpeg_cache_update:
-        description: 'Force update ffmpeg cache'
-        required: false
-        default: false
-        type: boolean
 
 jobs:
   unit:
@@ -62,36 +56,9 @@ jobs:
         submodules: true
     - name: Setup pnpm
       uses: pnpm/action-setup@v6.0.3
-    - name: Get current date
-      id: current-date
-      run: echo "today=$(date +'%Y-%m-%d')" >> $GITHUB_OUTPUT
-    - name: Setup and Restore ffmpeg/ffprobe Cache
-      id: cache-ffmpeg
-      uses: actions/cache@v5
-      with:
-        path: |
-          /usr/local/bin/ffmpeg
-          /usr/local/bin/ffprobe
-        # daily cache
-        key: ${{ runner.os }}-ffmpeg-${{ steps.current-date.outputs.today }}
-        restore-keys: |
-          ${{ runner.os }}-ffmpeg-${{ steps.current-date.outputs.today }}
     - name: Install FFmpeg
-      if: steps.cache-ffmpeg.outputs.cache-hit != 'true' || github.event.inputs.force_ffmpeg_cache_update == true
       run: |
-        for i in {1..3}; do
-          echo "Attempt $i: Installing FFmpeg..."
-          curl -s -L https://johnvansickle.com/ffmpeg/releases/ffmpeg-release-amd64-static.tar.xz -o ffmpeg.tar.xz && \
-          tar -xf ffmpeg.tar.xz && \
-          mv ffmpeg-*-static/ffmpeg /usr/local/bin/ && \
-          mv ffmpeg-*-static/ffprobe /usr/local/bin/ && \
-          rm -rf ffmpeg.tar.xz ffmpeg-*-static/ && \
-          break || sleep 10
-          if [ $i -eq 3 ]; then
-            echo "Failed to install FFmpeg after 3 attempts"
-            exit 1
-          fi
-        done
+        sudo apt install -y ffmpeg
     - name: Use Node.js
       uses: actions/setup-node@v6.4.0
       with:
diff --git a/.github/workflows/test-federation.yml b/.github/workflows/test-federation.yml
index a8b7831f44..0433931531 100644
--- a/.github/workflows/test-federation.yml
+++ b/.github/workflows/test-federation.yml
@@ -15,12 +15,6 @@ on:
       - packages/misskey-js/**
       - .github/workflows/test-federation.yml
   workflow_dispatch:
-    inputs:
-      force_ffmpeg_cache_update:
-        description: 'Force update ffmpeg cache'
-        required: false
-        default: false
-        type: boolean
 
 jobs:
   test:
@@ -37,36 +31,9 @@ jobs:
           submodules: true
       - name: Setup pnpm
         uses: pnpm/action-setup@v6.0.3
-      - name: Get current date
-        id: current-date
-        run: echo "today=$(date +'%Y-%m-%d')" >> $GITHUB_OUTPUT
-      - name: Setup and Restore ffmpeg/ffprobe Cache
-        id: cache-ffmpeg
-        uses: actions/cache@v5
-        with:
-          path: |
-            /usr/local/bin/ffmpeg
-            /usr/local/bin/ffprobe
-          # daily cache
-          key: ${{ runner.os }}-ffmpeg-${{ steps.current-date.outputs.today }}
-          restore-keys: |
-            ${{ runner.os }}-ffmpeg-${{ steps.current-date.outputs.today }}
       - name: Install FFmpeg
-        if: steps.cache-ffmpeg.outputs.cache-hit != 'true' || github.event.inputs.force_ffmpeg_cache_update == true
         run: |
-          for i in {1..3}; do
-            echo "Attempt $i: Installing FFmpeg..."
-            curl -s -L https://johnvansickle.com/ffmpeg/releases/ffmpeg-release-amd64-static.tar.xz -o ffmpeg.tar.xz && \
-            tar -xf ffmpeg.tar.xz && \
-            mv ffmpeg-*-static/ffmpeg /usr/local/bin/ && \
-            mv ffmpeg-*-static/ffprobe /usr/local/bin/ && \
-            rm -rf ffmpeg.tar.xz ffmpeg-*-static/ && \
-            break || sleep 10
-            if [ $i -eq 3 ]; then
-              echo "Failed to install FFmpeg after 3 attempts"
-              exit 1
-            fi
-          done
+          sudo apt install -y ffmpeg
       - name: Use Node.js
         uses: actions/setup-node@v6.4.0
         with: