diff --git a/.github/workflows/aarch64-linux-gnu.yaml b/.github/workflows/aarch64-linux-gnu.yaml
index d50d70e78..ab2416a70 100644
--- a/.github/workflows/aarch64-linux-gnu.yaml
+++ b/.github/workflows/aarch64-linux-gnu.yaml
@@ -47,7 +47,7 @@ jobs:
         os: [ubuntu-latest]
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
         with:
           fetch-depth: 0
 
@@ -147,7 +147,7 @@ jobs:
 
           tar cjvf ${dst}.tar.bz2 $dst
 
-      - uses: actions/upload-artifact@v2
+      - uses: actions/upload-artifact@v3
         with:
           path: sherpa-onnx-*linux-aarch64.tar.bz2
 
diff --git a/.github/workflows/android.yaml b/.github/workflows/android.yaml
index c7995ff4a..2acf57d1f 100644
--- a/.github/workflows/android.yaml
+++ b/.github/workflows/android.yaml
@@ -49,7 +49,7 @@ jobs:
         os: [ubuntu-latest]
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
         with:
           fetch-depth: 0
 
@@ -103,7 +103,7 @@ jobs:
 
           ls -lh
 
-      - uses: actions/upload-artifact@v2
+      - uses: actions/upload-artifact@v3
         with:
           name: sherpa-onnx-android-libs
           path: ./jniLibs
diff --git a/.github/workflows/apk.yaml b/.github/workflows/apk.yaml
index 180b0c14f..a9d01a107 100644
--- a/.github/workflows/apk.yaml
+++ b/.github/workflows/apk.yaml
@@ -25,7 +25,7 @@ jobs:
         os: [ubuntu-latest]
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
         with:
           fetch-depth: 0
       - name: Display NDK HOME
@@ -47,7 +47,7 @@ jobs:
         run: |
           ls -lh ./apks/
 
-      - uses: actions/upload-artifact@v2
+      - uses: actions/upload-artifact@v3
         with:
           path: ./apks/*.apk
 
diff --git a/.github/workflows/arm-linux-gnueabihf.yaml b/.github/workflows/arm-linux-gnueabihf.yaml
index ff74f8bcd..86e49810b 100644
--- a/.github/workflows/arm-linux-gnueabihf.yaml
+++ b/.github/workflows/arm-linux-gnueabihf.yaml
@@ -38,7 +38,7 @@ jobs:
         os: [ubuntu-latest]
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
         with:
           fetch-depth: 0
 
@@ -140,7 +140,7 @@ jobs:
 
           tar cjvf ${dst}.tar.bz2 $dst
 
-      - uses: actions/upload-artifact@v2
+      - uses: actions/upload-artifact@v3
         with:
           path: sherpa-onnx-*linux-arm-gnueabihf.tar.bz2
 
diff --git a/.github/workflows/build-wheels-aarch64.yaml b/.github/workflows/build-wheels-aarch64.yaml
index 9612e6fac..c75a32243 100644
--- a/.github/workflows/build-wheels-aarch64.yaml
+++ b/.github/workflows/build-wheels-aarch64.yaml
@@ -25,7 +25,7 @@ jobs:
         os: [ubuntu-latest]
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
 
       - name: Set up QEMU
         uses: docker/setup-qemu-action@v2
@@ -49,7 +49,7 @@ jobs:
 
           ls -lh ./wheelhouse/*.whl
 
-      - uses: actions/upload-artifact@v2
+      - uses: actions/upload-artifact@v3
         with:
           path: ./wheelhouse/*.whl
 
diff --git a/.github/workflows/build-wheels-armv7l.yaml b/.github/workflows/build-wheels-armv7l.yaml
index fb80bbed2..910d04db9 100644
--- a/.github/workflows/build-wheels-armv7l.yaml
+++ b/.github/workflows/build-wheels-armv7l.yaml
@@ -26,7 +26,7 @@ jobs:
         python-version: ["3.7", "3.8", "3.9", "3.10", "3.11"]
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
 
       - name: Set up QEMU
         uses: docker/setup-qemu-action@v2
diff --git a/.github/workflows/build-wheels-macos.yaml b/.github/workflows/build-wheels-macos.yaml
index f74108eab..56d3d2e5f 100644
--- a/.github/workflows/build-wheels-macos.yaml
+++ b/.github/workflows/build-wheels-macos.yaml
@@ -25,7 +25,7 @@ jobs:
         os: [macos-latest]
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
 
       # see https://cibuildwheel.readthedocs.io/en/stable/changelog/
       # for a list of versions
@@ -47,7 +47,7 @@ jobs:
 
           ls -lh ./wheelhouse/*.whl
 
-      - uses: actions/upload-artifact@v2
+      - uses: actions/upload-artifact@v3
         with:
           path: ./wheelhouse/*.whl
 
diff --git a/.github/workflows/build-wheels-win32.yaml b/.github/workflows/build-wheels-win32.yaml
index d44390fc0..f17b771de 100644
--- a/.github/workflows/build-wheels-win32.yaml
+++ b/.github/workflows/build-wheels-win32.yaml
@@ -25,7 +25,7 @@ jobs:
         os: [windows-latest]
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
 
       # see https://cibuildwheel.readthedocs.io/en/stable/changelog/
       # for a list of versions
@@ -44,7 +44,7 @@ jobs:
 
           ls -lh ./wheelhouse/*.whl
 
-      - uses: actions/upload-artifact@v2
+      - uses: actions/upload-artifact@v3
         with:
           path: ./wheelhouse/*.whl
 
diff --git a/.github/workflows/build-wheels.yaml b/.github/workflows/build-wheels.yaml
index d1b3beba1..0384c3271 100644
--- a/.github/workflows/build-wheels.yaml
+++ b/.github/workflows/build-wheels.yaml
@@ -25,7 +25,7 @@ jobs:
         os: [ubuntu-latest, windows-latest]
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
 
       # see https://cibuildwheel.readthedocs.io/en/stable/changelog/
       # for a list of versions
@@ -61,7 +61,7 @@ jobs:
           rm -rf ./wheelhouse
           mv ./wheels ./wheelhouse
 
-      - uses: actions/upload-artifact@v2
+      - uses: actions/upload-artifact@v3
         with:
           path: ./wheelhouse/*.whl
 
diff --git a/.github/workflows/build-xcframework.yaml b/.github/workflows/build-xcframework.yaml
index 785d94d61..92742c093 100644
--- a/.github/workflows/build-xcframework.yaml
+++ b/.github/workflows/build-xcframework.yaml
@@ -26,7 +26,7 @@ jobs:
         os: [macos-latest]
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
 
       - name: Build iOS
         shell: bash
@@ -57,7 +57,7 @@ jobs:
 
           ls -lh
 
-      - uses: actions/upload-artifact@v2
+      - uses: actions/upload-artifact@v3
         with:
           name: sherpa-onnx-ios-libs
           path: ./build-ios
diff --git a/.github/workflows/dot-net.yaml b/.github/workflows/dot-net.yaml
index 7c33c9090..2741b486b 100644
--- a/.github/workflows/dot-net.yaml
+++ b/.github/workflows/dot-net.yaml
@@ -23,7 +23,7 @@ jobs:
         os: [ubuntu-latest, windows-latest, macos-latest]
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       # see https://cibuildwheel.readthedocs.io/en/stable/changelog/
       # for a list of versions
       - name: Build wheels
@@ -42,7 +42,7 @@ jobs:
           ls -lh ./wheelhouse/*.whl
           unzip -l ./wheelhouse/*.whl
 
-      - uses: actions/upload-artifact@v2
+      - uses: actions/upload-artifact@v3
         with:
           name: ${{ matrix.os }}-wheels
           path: ./wheelhouse/*.whl
@@ -53,7 +53,7 @@ jobs:
     needs: build-libs
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
 
       - name: Retrieve artifact from ubuntu-latest
         uses: actions/download-artifact@v2
@@ -119,7 +119,7 @@ jobs:
           ./run.sh
           ls -lh packages
 
-      - uses: actions/upload-artifact@v2
+      - uses: actions/upload-artifact@v3
         name: upload nuget packages
         with:
           name: nuget-packages
diff --git a/.github/workflows/export-whisper-to-onnx.yaml b/.github/workflows/export-whisper-to-onnx.yaml
index 4d6f9531d..554e20655 100644
--- a/.github/workflows/export-whisper-to-onnx.yaml
+++ b/.github/workflows/export-whisper-to-onnx.yaml
@@ -19,7 +19,7 @@ jobs:
         model: ["tiny.en", "base.en", "small.en", "medium.en", "tiny", "base", "small", "medium", "large", "large-v1", "large-v2"]
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
 
       - name: Install dependencies
         shell: bash
diff --git a/.github/workflows/jni.yaml b/.github/workflows/jni.yaml
index 853d2dcb9..459cc3836 100644
--- a/.github/workflows/jni.yaml
+++ b/.github/workflows/jni.yaml
@@ -40,10 +40,15 @@ jobs:
         os: [ubuntu-latest, macos-latest]
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
         with:
           fetch-depth: 0
 
+      - name: ccache
+        uses: hendrikmuhs/ccache-action@v1.2
+        with:
+          key: ${{ matrix.os }}
+
       - name: Display kotlin version
         shell: bash
         run: |
@@ -58,5 +63,9 @@ jobs:
       - name:  Run JNI test
         shell: bash
         run: |
+          export CMAKE_CXX_COMPILER_LAUNCHER=ccache
+          export PATH="/usr/lib/ccache:/usr/local/opt/ccache/libexec:$PATH"
+          cmake --version
+
           cd ./kotlin-api-examples
           ./run.sh
diff --git a/.github/workflows/linux-gpu.yaml b/.github/workflows/linux-gpu.yaml
index db01420f3..ba7b4a004 100644
--- a/.github/workflows/linux-gpu.yaml
+++ b/.github/workflows/linux-gpu.yaml
@@ -50,13 +50,22 @@ jobs:
         build_type: [Release, Debug]
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           fetch-depth: 0
 
+      - name: ccache
+        uses: hendrikmuhs/ccache-action@v1.2
+        with:
+          key: ${{ matrix.os }}-${{ matrix.build_type }}-gpu
+
       - name: Configure CMake
         shell: bash
         run: |
+          export CMAKE_CXX_COMPILER_LAUNCHER=ccache
+          export PATH="/usr/lib/ccache:/usr/local/opt/ccache/libexec:$PATH"
+          cmake --version
+
           mkdir build
           cd build
           cmake -D CMAKE_BUILD_TYPE=${{ matrix.build_type }} -DCMAKE_INSTALL_PREFIX=./install -DBUILD_SHARED_LIBS=ON -DSHERPA_ONNX_ENABLE_GPU=ON ..
@@ -64,6 +73,8 @@ jobs:
       - name: Build sherpa-onnx for ubuntu
         shell: bash
         run: |
+          export PATH="/usr/lib/ccache:/usr/local/opt/ccache/libexec:$PATH"
+
           cd build
           make -j2
           make install
diff --git a/.github/workflows/linux.yaml b/.github/workflows/linux.yaml
index 4fb48c4cf..927e6bd44 100644
--- a/.github/workflows/linux.yaml
+++ b/.github/workflows/linux.yaml
@@ -51,13 +51,22 @@ jobs:
         shared_lib: [ON, OFF]
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           fetch-depth: 0
 
+      - name: ccache
+        uses: hendrikmuhs/ccache-action@v1.2
+        with:
+          key: ${{ matrix.os }}-${{ matrix.build_type }}-shared-${{ matrix.shared_lib }}
+
       - name: Configure CMake
         shell: bash
         run: |
+          export CMAKE_CXX_COMPILER_LAUNCHER=ccache
+          export PATH="/usr/lib/ccache:/usr/local/opt/ccache/libexec:$PATH"
+          cmake --version
+
           mkdir build
           cd build
           cmake -D CMAKE_BUILD_TYPE=${{ matrix.build_type }} -D BUILD_SHARED_LIBS=${{ matrix.shared_lib }} -DCMAKE_INSTALL_PREFIX=./install ..
@@ -65,6 +74,8 @@ jobs:
       - name: Build sherpa-onnx for ubuntu
         shell: bash
         run: |
+          export PATH="/usr/lib/ccache:/usr/local/opt/ccache/libexec:$PATH"
+
           cd build
           make -j2
           make install
diff --git a/.github/workflows/macos.yaml b/.github/workflows/macos.yaml
index 721e1db3c..ef9e889b7 100644
--- a/.github/workflows/macos.yaml
+++ b/.github/workflows/macos.yaml
@@ -46,13 +46,22 @@ jobs:
         build_type: [Release, Debug]
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           fetch-depth: 0
 
+      - name: ccache
+        uses: hendrikmuhs/ccache-action@v1.2
+        with:
+          key: ${{ matrix.os }}-${{ matrix.build_type }}
+
       - name: Configure CMake
         shell: bash
         run: |
+          export CMAKE_CXX_COMPILER_LAUNCHER=ccache
+          export PATH="/usr/lib/ccache:/usr/local/opt/ccache/libexec:$PATH"
+          cmake --version
+
           mkdir build
           cd build
           cmake -D CMAKE_BUILD_TYPE=${{ matrix.build_type }} -DCMAKE_OSX_ARCHITECTURES='arm64;x86_64' -DCMAKE_INSTALL_PREFIX=./install ..
@@ -60,6 +69,8 @@ jobs:
       - name: Build sherpa-onnx for macos
         shell: bash
         run: |
+          export PATH="/usr/lib/ccache:/usr/local/opt/ccache/libexec:$PATH"
+
           cd build
           make -j2
           make install
diff --git a/.github/workflows/mfc.yaml b/.github/workflows/mfc.yaml
index 7d0061c62..78dbfe615 100644
--- a/.github/workflows/mfc.yaml
+++ b/.github/workflows/mfc.yaml
@@ -40,7 +40,7 @@ jobs:
         arch: [x64]
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
         with:
           fetch-depth: 0
 
@@ -90,13 +90,13 @@ jobs:
           ls -lh
 
       - name: Upload artifact
-        uses: actions/upload-artifact@v2
+        uses: actions/upload-artifact@v3
         with:
           name: streaming-speech-recognition-${{ matrix.arch }}
           path: ./mfc-examples/${{ matrix.arch }}/Release/StreamingSpeechRecognition.exe
 
       - name: Upload artifact
-        uses: actions/upload-artifact@v2
+        uses: actions/upload-artifact@v3
         with:
           name: non-streaming-speech-recognition-${{ matrix.arch }}
           path: ./mfc-examples/${{ matrix.arch }}/Release/NonStreamingSpeechRecognition.exe
diff --git a/.github/workflows/nightly-wheel-arm.yaml b/.github/workflows/nightly-wheel-arm.yaml
index 2f5ca5a15..e52bc5afa 100644
--- a/.github/workflows/nightly-wheel-arm.yaml
+++ b/.github/workflows/nightly-wheel-arm.yaml
@@ -32,7 +32,7 @@ jobs:
         python-version: ["3.7", "3.8", "3.9", "3.10", "3.11"]
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
         with:
           fetch-depth: 0
 
diff --git a/.github/workflows/pkg-config.yaml b/.github/workflows/pkg-config.yaml
index 4a898e373..6a15f06f4 100644
--- a/.github/workflows/pkg-config.yaml
+++ b/.github/workflows/pkg-config.yaml
@@ -44,13 +44,22 @@ jobs:
         lib_type: [shared, static]
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
         with:
           fetch-depth: 0
 
+      - name: ccache
+        uses: hendrikmuhs/ccache-action@v1.2
+        with:
+          key: ${{ matrix.os }}-${{ matrix.build_type }}-lib-${{ matrix.lib_type }}
+
       - name: Configure CMake
         shell: bash
         run: |
+          export CMAKE_CXX_COMPILER_LAUNCHER=ccache
+          export PATH="/usr/lib/ccache:/usr/local/opt/ccache/libexec:$PATH"
+          cmake --version
+
           mkdir build
           cd build
           if [[ ${{ matrix.lib_type }} == "shared" ]]; then
@@ -62,6 +71,8 @@ jobs:
       - name: Build sherpa-onnx for ${{ matrix.os }} ${{ matrix.build_type }} ${{ matrix.lib_type }}
         shell: bash
         run: |
+          export PATH="/usr/lib/ccache:/usr/local/opt/ccache/libexec:$PATH"
+
           cd build
           make -j2
           make install
diff --git a/.github/workflows/release-go.yaml b/.github/workflows/release-go.yaml
index b922c0d72..87f12f23a 100644
--- a/.github/workflows/release-go.yaml
+++ b/.github/workflows/release-go.yaml
@@ -31,7 +31,7 @@ jobs:
         os: [ubuntu-latest]
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
 
       - name: SSH to GitHub
         run: |
@@ -58,7 +58,7 @@ jobs:
           ls -lh ./wheelhouse/*.whl
           unzip -l ./wheelhouse/*.whl
 
-      - uses: actions/upload-artifact@v2
+      - uses: actions/upload-artifact@v3
         with:
           name: ${{ matrix.os }}-wheels-for-go
           path: ./wheelhouse/*.whl
@@ -73,10 +73,20 @@ jobs:
         arch: [x86_64, arm64]
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
+
+      - name: ccache
+        uses: hendrikmuhs/ccache-action@v1.2
+        with:
+          key: ${{ matrix.os }}-${{ matrix.arch }}
+
       - name: Configure CMake
         shell: bash
         run: |
+          export CMAKE_CXX_COMPILER_LAUNCHER=ccache
+          export PATH="/usr/lib/ccache:/usr/local/opt/ccache/libexec:$PATH"
+          cmake --version
+
           mkdir build
           cd build
           cmake -D CMAKE_BUILD_TYPE=${{ matrix.build_type }} -D BUILD_SHARED_LIBS=ON -DCMAKE_OSX_ARCHITECTURES=${{ matrix.arch }} -DCMAKE_INSTALL_PREFIX=./install ..
@@ -84,6 +94,8 @@ jobs:
       - name: Build sherpa-onnx for macOS ${{ matrix.arch }}
         shell: bash
         run: |
+          export PATH="/usr/lib/ccache:/usr/local/opt/ccache/libexec:$PATH"
+
           cd build
           make -j2
           make install
@@ -93,7 +105,7 @@ jobs:
 
           file install/lib/lib*
 
-      - uses: actions/upload-artifact@v2
+      - uses: actions/upload-artifact@v3
         with:
           name: ${{ matrix.os }}-for-${{ matrix.arch }}
           path: ./build/install/lib/
@@ -107,7 +119,7 @@ jobs:
         os: [windows-latest]
         arch: [x64, Win32]
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
         with:
           fetch-depth: 0
 
@@ -131,7 +143,7 @@ jobs:
           ls -lh install/bin
 
       - name: Upload artifact
-        uses: actions/upload-artifact@v2
+        uses: actions/upload-artifact@v3
         with:
           name: sherpa-onnx-go-windows-${{ matrix.arch }}
           path: ./build/install/lib/
@@ -142,7 +154,7 @@ jobs:
     needs: [linux-x86_64_wheel, macOS, windows]
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
 
       - name: Add SSH key
         run: |
diff --git a/.github/workflows/run-java-test.yaml b/.github/workflows/run-java-test.yaml
index f9c95379b..e974f29a8 100644
--- a/.github/workflows/run-java-test.yaml
+++ b/.github/workflows/run-java-test.yaml
@@ -39,10 +39,15 @@ jobs:
         os: [ubuntu-latest]
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
         with:
           fetch-depth: 0
 
+      - name: ccache
+        uses: hendrikmuhs/ccache-action@v1.2
+        with:
+          key: ${{ matrix.os }}
+
       - name: Display java version
         shell: bash
         run: |
@@ -52,5 +57,9 @@ jobs:
       - name:  Run java test
         shell: bash
         run: |
+          export CMAKE_CXX_COMPILER_LAUNCHER=ccache
+          export PATH="/usr/lib/ccache:/usr/local/opt/ccache/libexec:$PATH"
+          cmake --version
+
           cd ./java-api-examples
           ./runtest.sh
diff --git a/.github/workflows/run-python-test.yaml b/.github/workflows/run-python-test.yaml
index 4fc26ad7b..036e06dd1 100644
--- a/.github/workflows/run-python-test.yaml
+++ b/.github/workflows/run-python-test.yaml
@@ -43,10 +43,15 @@ jobs:
             python-version: "3.10"
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           fetch-depth: 0
 
+      - name: ccache
+        uses: hendrikmuhs/ccache-action@v1.2
+        with:
+          key: ${{ matrix.os }}-python-${{ matrix.python-version }}
+
       - name: Setup Python
         uses: actions/setup-python@v2
         with:
@@ -60,6 +65,10 @@ jobs:
       - name: Install sherpa-onnx
         shell: bash
         run: |
+          export CMAKE_CXX_COMPILER_LAUNCHER=ccache
+          export PATH="/usr/lib/ccache:/usr/local/opt/ccache/libexec:$PATH"
+          cmake --version
+
           python3 -m pip install --verbose .
 
       - name: Test sherpa-onnx
diff --git a/.github/workflows/style_check.yaml b/.github/workflows/style_check.yaml
index 5b996e75e..79630889c 100644
--- a/.github/workflows/style_check.yaml
+++ b/.github/workflows/style_check.yaml
@@ -44,7 +44,7 @@ jobs:
       fail-fast: false
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
         with:
           fetch-depth: 0
 
diff --git a/.github/workflows/test-dot-net.yaml b/.github/workflows/test-dot-net.yaml
index bd6880151..98ecbc9ce 100644
--- a/.github/workflows/test-dot-net.yaml
+++ b/.github/workflows/test-dot-net.yaml
@@ -42,7 +42,7 @@ jobs:
         os: [ubuntu-latest, macos-latest, windows-latest]
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
         with:
           fetch-depth: 0
 
diff --git a/.github/workflows/test-go-package.yaml b/.github/workflows/test-go-package.yaml
index 7ebbc9f40..186e197e4 100644
--- a/.github/workflows/test-go-package.yaml
+++ b/.github/workflows/test-go-package.yaml
@@ -34,7 +34,7 @@ jobs:
             arch: x86 # use 386 for GOARCH
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           fetch-depth: 0
       - uses: actions/setup-go@v4
diff --git a/.github/workflows/test-go.yaml b/.github/workflows/test-go.yaml
index bee9a8f54..a37465ff9 100644
--- a/.github/workflows/test-go.yaml
+++ b/.github/workflows/test-go.yaml
@@ -26,7 +26,7 @@ jobs:
             arch: amd64
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           fetch-depth: 0
 
diff --git a/.github/workflows/test-pip-install.yaml b/.github/workflows/test-pip-install.yaml
index e9e8005ff..aebbc2891 100644
--- a/.github/workflows/test-pip-install.yaml
+++ b/.github/workflows/test-pip-install.yaml
@@ -35,7 +35,7 @@ jobs:
             python-version: "3.7"
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           fetch-depth: 0
 
diff --git a/.github/workflows/test-python-offline-websocket-server.yaml b/.github/workflows/test-python-offline-websocket-server.yaml
index b000b331f..8f0414895 100644
--- a/.github/workflows/test-python-offline-websocket-server.yaml
+++ b/.github/workflows/test-python-offline-websocket-server.yaml
@@ -28,10 +28,15 @@ jobs:
         model_type: ["transducer", "paraformer", "nemo_ctc", "whisper", "tdnn"]
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
         with:
           fetch-depth: 0
 
+      - name: ccache
+        uses: hendrikmuhs/ccache-action@v1.2
+        with:
+          key: ${{ matrix.os }}-python-${{ matrix.python-version }}
+
       - name: Setup Python ${{ matrix.python-version }}
         uses: actions/setup-python@v2
         with:
@@ -45,10 +50,13 @@ jobs:
       - name: Install sherpa-onnx
         shell: bash
         run: |
+          export CMAKE_CXX_COMPILER_LAUNCHER=ccache
+          export PATH="/usr/lib/ccache:/usr/local/opt/ccache/libexec:$PATH"
+          cmake --version
+
           python3 -m pip install --no-deps --verbose .
           python3 -m pip install websockets
 
-
       - name: Start server for transducer models
         if: matrix.model_type == 'transducer'
         shell: bash
diff --git a/.github/workflows/test-python-online-websocket-server.yaml b/.github/workflows/test-python-online-websocket-server.yaml
index 5d648899b..7ec641228 100644
--- a/.github/workflows/test-python-online-websocket-server.yaml
+++ b/.github/workflows/test-python-online-websocket-server.yaml
@@ -28,10 +28,15 @@ jobs:
         model_type: ["transducer", "paraformer"]
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
         with:
           fetch-depth: 0
 
+      - name: ccache
+        uses: hendrikmuhs/ccache-action@v1.2
+        with:
+          key: ${{ matrix.os }}-python-${{ matrix.python-version }}
+
       - name: Setup Python ${{ matrix.python-version }}
         uses: actions/setup-python@v2
         with:
@@ -45,6 +50,10 @@ jobs:
       - name: Install sherpa-onnx
         shell: bash
         run: |
+          export CMAKE_CXX_COMPILER_LAUNCHER=ccache
+          export PATH="/usr/lib/ccache:/usr/local/opt/ccache/libexec:$PATH"
+          cmake --version
+
           python3 -m pip install --no-deps --verbose .
           python3 -m pip install websockets
 
diff --git a/.github/workflows/windows-x64-cuda.yaml b/.github/workflows/windows-x64-cuda.yaml
index cd181fb12..e89f0ddd4 100644
--- a/.github/workflows/windows-x64-cuda.yaml
+++ b/.github/workflows/windows-x64-cuda.yaml
@@ -46,7 +46,7 @@ jobs:
         os: [windows-latest]
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
         with:
           fetch-depth: 0
 
diff --git a/.github/workflows/windows-x64.yaml b/.github/workflows/windows-x64.yaml
index 9e826f977..e929d1d01 100644
--- a/.github/workflows/windows-x64.yaml
+++ b/.github/workflows/windows-x64.yaml
@@ -47,7 +47,7 @@ jobs:
         shared_lib: [ON, OFF]
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           fetch-depth: 0
 
diff --git a/.github/workflows/windows-x86.yaml b/.github/workflows/windows-x86.yaml
index c6fa61ea2..1117ea257 100644
--- a/.github/workflows/windows-x86.yaml
+++ b/.github/workflows/windows-x86.yaml
@@ -47,7 +47,7 @@ jobs:
         shared_lib: [ON, OFF]
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           fetch-depth: 0