diff --git a/.github/workflows/build_test.yaml b/.github/workflows/build_test.yaml
index 28e7754..3659353 100644
--- a/.github/workflows/build_test.yaml
+++ b/.github/workflows/build_test.yaml
@@ -22,7 +22,7 @@ jobs:
         with:
           python-version: '3.8'
       - run: pip install cpplint
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - run: .tools/cpplint.bash
 
   build_and_test:
@@ -30,7 +30,7 @@ jobs:
     strategy:
       fail-fast: false # 他のjobが失敗してもキャンセルしない
       matrix:
-        os: [ubuntu-18.04, ubuntu-20.04]
+        os: [ubuntu-20.04, ubuntu-22.04]
     runs-on: ${{ matrix.os}}
     steps:
       - name: Install Dynamixel SDK
@@ -51,7 +51,7 @@ jobs:
           sudo make install
       - name: Install dependencies
         run: sudo apt install libyaml-cpp-dev libeigen3-dev
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Build and insall library
         run: ./rt_manipulators_lib/build_install_library.bash
       - name: Build Samples
diff --git a/README.md b/README.md
index 52ea67b..7a7fc8a 100644
--- a/README.md
+++ b/README.md
@@ -21,8 +21,8 @@
 - [yaml-cpp (>= 0.5.0)](https://github.com/jbeder/yaml-cpp)
 - Eigen (>= 3.3.4)
 - Linux OS
-    - Ubuntu 18.04
     - Ubuntu 20.04
+    - Ubuntu 22.04
 - ロボット
     - [CRANE-X7](https://rt-net.jp/products/crane-x7/)
     - [Sciurus17](https://rt-net.jp/products/sciurus17/)