diff --git a/.github/workflows/linux-ci.yml b/.github/workflows/linux-ci.yml
index 0c13588..cb9f84c 100644
--- a/.github/workflows/linux-ci.yml
+++ b/.github/workflows/linux-ci.yml
@@ -9,7 +9,7 @@ on:
 jobs:
   build:
 
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-22.04
 
     steps:
     - uses: actions/checkout@v2
@@ -17,8 +17,8 @@ jobs:
       run: |
         sudo add-apt-repository -y ppa:ubuntu-toolchain-r/test
         sudo apt-get update -qq
-        sudo apt-get install -y gcc-7 g++-7
-        sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-7 70 --slave /usr/bin/g++ g++ /usr/bin/g++-7
+        sudo apt-get install -y gcc-11 g++-11
+        sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-11 70 --slave /usr/bin/g++ g++ /usr/bin/g++-11
         sudo apt-get install -y tcl8.6-dev
     - name: make
       run: make
diff --git a/test/CMakeLists.txt b/test/CMakeLists.txt
index 0a30144..5fd807c 100644
--- a/test/CMakeLists.txt
+++ b/test/CMakeLists.txt
@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.0)
+cmake_minimum_required(VERSION 3.8)
 
 set(TCL_TCLSH tclsh8.6)