diff --git a/.github/workflows/macos.yml b/.github/workflows/macos.yml
index b1d9ca9..8e14948 100644
--- a/.github/workflows/macos.yml
+++ b/.github/workflows/macos.yml
@@ -9,8 +9,8 @@ jobs:
       fail-fast: false
       matrix:
         config:
-        - { os: macos-10.15 }
-        - { os: macos-11.0  }
+        - { os: macos-10.15 } # https://github.com/actions/virtual-environments/blob/main/images/macos/macos-10.15-Readme.md#xcode
+        - { os: macos-11.0  } # https://github.com/actions/virtual-environments/blob/main/images/macos/macos-11.0-Readme.md#xcode
         build: [Debug, Release]
 
     name: "${{matrix.config.os}}:${{matrix.build}}"
diff --git a/.github/workflows/ubuntu.yml b/.github/workflows/ubuntu.yml
index db09ac7..8c38d32 100644
--- a/.github/workflows/ubuntu.yml
+++ b/.github/workflows/ubuntu.yml
@@ -10,8 +10,8 @@ jobs:
       matrix:
         build: [Debug, Release]
         compiler:
-        - { cc: "gcc-9",    cxx: "g++-9" }
-        - { cc: "gcc-10",   cxx: "g++-10" }
+        - { cc: "gcc-9",    cxx: "g++-9"      }
+        - { cc: "gcc-10",   cxx: "g++-10"     }
         - { cc: "clang-10", cxx: "clang++-10" }
         - { cc: "clang-11", cxx: "clang++-11" }
         - { cc: "clang-12", cxx: "clang++-12" }
diff --git a/.github/workflows/windows.yml b/.github/workflows/windows.yml
index 266e389..c9dae9d 100644
--- a/.github/workflows/windows.yml
+++ b/.github/workflows/windows.yml
@@ -11,6 +11,7 @@ jobs:
         config:
         - { os: windows-2016, vs: "Visual Studio 2017" } # https://github.com/actions/virtual-environments/blob/main/images/win/Windows2016-Readme.md#visual-studio-enterprise-2017
         - { os: windows-2019, vs: "Visual Studio 2019" } # https://github.com/actions/virtual-environments/blob/main/images/win/Windows2019-Readme.md#visual-studio-enterprise-2019
+        - { os: windows-2022, vs: "Visual Studio 2022" } # https://github.com/actions/virtual-environments/blob/main/images/win/Windows2022-Readme.md#visual-studio-enterprise-2022
         build: [Debug, Release]
         platform: [Win32, x64]