diff --git a/.github/workflows/macos.yml b/.github/workflows/macos.yml
index 859bd70..8c57825 100644
--- a/.github/workflows/macos.yml
+++ b/.github/workflows/macos.yml
@@ -11,8 +11,8 @@ jobs:
       fail-fast: false
       matrix:
         config:
-        - { os: macos-11  } # https://github.com/actions/virtual-environments/blob/main/images/macos/macos-11-Readme.md#xcode
-        - { os: macos-12 } # https://github.com/actions/virtual-environments/blob/main/images/macos/macos-12-Readme.md#xcode
+        - { os: macos-13 } # https://github.com/actions/virtual-environments/blob/main/images/macos/macos-13-Readme.md#xcode
+        - { os: macos-14 } # https://github.com/actions/virtual-environments/blob/main/images/macos/macos-14-Readme.md#xcode
 
     name: "${{ matrix.config.os }}"
     steps:
diff --git a/.github/workflows/ubuntu.yml b/.github/workflows/ubuntu.yml
index b416d9f..930c59c 100644
--- a/.github/workflows/ubuntu.yml
+++ b/.github/workflows/ubuntu.yml
@@ -16,6 +16,8 @@ jobs:
         - { cc: "gcc-11",   cxx: "g++-11",     os: "ubuntu-20.04" }
         - { cc: "gcc-11",   cxx: "g++-11",     os: "ubuntu-20.04" }
         - { cc: "gcc-12",   cxx: "g++-12",     os: "ubuntu-22.04" }
+        - { cc: "gcc-13",   cxx: "g++-12",     os: "ubuntu-22.04" }
+        - { cc: "gcc-14",   cxx: "g++-12",     os: "ubuntu-22.04" }
         - { cc: "clang-9",  cxx: "clang++-9",  os: "ubuntu-20.04" }
         - { cc: "clang-10", cxx: "clang++-10", os: "ubuntu-20.04" }
         - { cc: "clang-11", cxx: "clang++-11", os: "ubuntu-20.04" }