diff --git a/.github/workflows/bvt-clang.yml b/.github/workflows/bvt-clang.yml
index a88d076..7dea031 100644
--- a/.github/workflows/bvt-clang.yml
+++ b/.github/workflows/bvt-clang.yml
@@ -7,7 +7,7 @@ on:
 
 jobs:
   bvt-clang:
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-24.04
     steps:
     - uses: actions/checkout@v3
       with:
@@ -15,12 +15,6 @@ jobs:
 
     - name: install clang
       run: |
-        wget -O - https://apt.llvm.org/llvm-snapshot.gpg.key | sudo apt-key add -
-        sudo apt-add-repository "deb http://apt.llvm.org/jammy/ llvm-toolchain-jammy-15 main" -y
-        sudo apt-add-repository "deb http://apt.llvm.org/jammy/ llvm-toolchain-jammy-16 main" -y
-        sudo apt-add-repository "deb http://apt.llvm.org/jammy/ llvm-toolchain-jammy-17 main" -y
-        sudo apt-add-repository "deb http://apt.llvm.org/jammy/ llvm-toolchain-jammy-18 main" -y
-        sudo apt update
         sudo apt install -y clang-15 clang-16 clang-17 clang-18
 
     - name: check compiler versions
diff --git a/.github/workflows/bvt-gcc.yml b/.github/workflows/bvt-gcc.yml
index dd29012..142dfa6 100644
--- a/.github/workflows/bvt-gcc.yml
+++ b/.github/workflows/bvt-gcc.yml
@@ -7,7 +7,7 @@ on:
 
 jobs:
   bvt-gcc:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-24.04
     steps:
     - uses: actions/checkout@v3
       with:
@@ -15,15 +15,14 @@ jobs:
 
     - name: install gcc
       run: |
-        sudo add-apt-repository ppa:ubuntu-toolchain-r/test -y
-        sudo apt update
-        sudo apt install -y gcc-11 g++-11 gcc-12 g++-12 gcc-13 g++-13
+        sudo apt install -y gcc-11 g++-11 gcc-12 g++-12 gcc-13 g++-13 gcc-14 g++-14
 
     - name: check compiler versions
       run: |
         g++-11 --version
         g++-12 --version
         g++-13 --version
+        g++-14 --version
 
     - name: build and run test with gcc 11
       run: |
@@ -42,3 +41,9 @@ jobs:
         cmake -B build-gcc-13 -DCMAKE_C_COMPILER=gcc-13 -DCMAKE_CXX_COMPILER=g++-13
         cmake --build build-gcc-13 -j
         ctest --test-dir build-gcc-13 -j
+
+    - name: build and run test with gcc 14
+      run: |
+        cmake -B build-gcc-14 -DCMAKE_C_COMPILER=gcc-14 -DCMAKE_CXX_COMPILER=g++-14
+        cmake --build build-gcc-14 -j
+        ctest --test-dir build-gcc-14 -j