diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 2be33cf..70a483d 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -36,15 +36,16 @@ jobs:
           fi
       - uses: actions/cache@v6
         with:
-          key: build-cache-v2-${{ matrix.platform }}-${{ hashFiles('build.sh', 'setup.sh', '*/pyproject.toml', '*/setup.py', '*/build.sh') }}
-          restore-keys: build-cache-v2-${{ matrix.platform }}-
+          key: ccache-${{ matrix.platform }}-${{ github.run_id }}
+          restore-keys: ccache-${{ matrix.platform }}-
+          path: .ccache
+      - uses: actions/cache@v6
+        with:
+          key: downloads-${{ matrix.platform }}-${{ hashFiles('gcc-arm-none-eabi/build.sh', 'git-lfs/build.sh') }}
           path: |
             .uv-cache
-            */*/install
             */*/toolchain
             */*/bin
-            */*-src
-            */build
       - name: Build wheels
         env:
           MANYLINUX: ${{ runner.os == 'Linux' && '1' || '0' }}
diff --git a/.gitignore b/.gitignore
index 6d0cd60..0b980f8 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,6 +1,7 @@
 .git/
 repo/
 .venv/
+.ccache/
 __pycache__/
 uv.lock
 
diff --git a/build.sh b/build.sh
index fe03a50..a0c2f8f 100755
--- a/build.sh
+++ b/build.sh
@@ -24,6 +24,7 @@ if [[ "$USE_MANYLINUX" == "1" && -z "${BUILD_SH_IN_MANYLINUX:-}" ]]; then
     -e BUILD_SH_HOST_GID="$(id -g)" \
     -e HOME=/tmp \
     -e UV_CACHE_DIR=/work/.uv-cache \
+    -e CCACHE_DIR=/work/.ccache \
     -e UV_PYTHON=/opt/python/cp312-cp312/bin/python3 \
     -v "$ROOT_DIR:/work" \
     -v "$UV_BIN:/usr/local/bin/uv:ro" \
@@ -61,6 +62,7 @@ fi
 
 export CMAKE_C_COMPILER_LAUNCHER=ccache
 export CMAKE_CXX_COMPILER_LAUNCHER=ccache
+export CCACHE_DIR="${CCACHE_DIR:-$ROOT_DIR/.ccache}"
 
 restore_build_versions() {
   python3 build_versions.py restore */pyproject.toml
diff --git a/cppcheck/build.sh b/cppcheck/build.sh
index 329f476..4fbee9c 100755
--- a/cppcheck/build.sh
+++ b/cppcheck/build.sh
@@ -8,7 +8,7 @@ VERSION="2.21.0"
 INSTALL_DIR="$DIR/cppcheck/install"
 
 NJOBS="$(nproc 2>/dev/null || sysctl -n hw.ncpu 2>/dev/null || echo 2)"
-CXX="ccache ${CXX:-c++}"
+export CXX="ccache ${CXX:-c++}"
 
 # Clone/update source
 if [ ! -d "cppcheck-src/.git" ]; then
diff --git a/ffmpeg/build.sh b/ffmpeg/build.sh
index 7c3f9c2..30c76cd 100755
--- a/ffmpeg/build.sh
+++ b/ffmpeg/build.sh
@@ -13,7 +13,7 @@ LIBVA_VERSION="2.22.0"
 INSTALL_DIR="$DIR/ffmpeg/install"
 
 NJOBS="$(nproc 2>/dev/null || sysctl -n hw.ncpu 2>/dev/null || echo 2)"
-CC="ccache ${CC:-cc}"
+export CC="ccache ${CC:-cc}"
 PREFIX="$DIR/build/prefix"
 mkdir -p "$DIR/build"
 rm -rf "$PREFIX"