diff --git a/.github/workflows/check-build.yml b/.github/workflows/check-build.yml
index 19d8326..d48aa9f 100644
--- a/.github/workflows/check-build.yml
+++ b/.github/workflows/check-build.yml
@@ -14,7 +14,7 @@ jobs:
 
     steps:
       - name: Clone
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Dependencies
         run: |
@@ -38,7 +38,7 @@ jobs:
 
     steps:
       - name: Clone
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: MSBuild
         uses: microsoft/setup-msbuild@v2
diff --git a/CMakeLists.txt b/CMakeLists.txt
index bb1c4e9..29ad7b6 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -4,7 +4,7 @@ if(POLICY CMP0077)
   cmake_policy(SET CMP0077 NEW)
 endif()
 
-project(SPTK VERSION 4.3)
+project(SPTK VERSION 4.4)
 
 option(SPTK_INSTALL "Install SPTK library" ON)
 option(SPTK_BUILD_COMMANDS "Build SPTK commands" ON)
diff --git a/README.md b/README.md
index 76aad91..f832a2f 100644
--- a/README.md
+++ b/README.md
@@ -6,7 +6,7 @@ The Speech Signal Processing Toolkit (SPTK) is a software for speech signal proc
 - PyTorch version: [diffsptk](https://github.com/sp-nitech/diffsptk)
 
 [![](https://img.shields.io/badge/docs-latest-blue.svg)](https://sp-nitech.github.io/sptk/latest/)
-[![](https://img.shields.io/badge/docs-stable-blue.svg)](https://sp-nitech.github.io/sptk/4.3/)
+[![](https://img.shields.io/badge/docs-stable-blue.svg)](https://sp-nitech.github.io/sptk/4.4/)
 [![](https://img.shields.io/badge/license-Apache%202.0-green.svg)](https://github.com/sp-nitech/SPTK/blob/master/LICENSE)
 [![](https://github.com/sp-nitech/SPTK/workflows/build/badge.svg)](https://github.com/sp-nitech/SPTK/actions)
 
diff --git a/include/SPTK/utils/sptk_utils.h b/include/SPTK/utils/sptk_utils.h
index 3f0f858..4fdcac7 100644
--- a/include/SPTK/utils/sptk_utils.h
+++ b/include/SPTK/utils/sptk_utils.h
@@ -36,7 +36,7 @@
 namespace sptk {
 
 //! Version of SPTK.
-static const char* const kVersion("4.3");
+static const char* const kVersion("4.4");
 //! @f$\pi@f$
 static const double kPi(3.141592653589793);
 //! @f$2\pi@f$
diff --git a/test/test_raw2wav.bats b/test/test_raw2wav.bats
old mode 100644
new mode 100755