diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index e9469c1..7169173 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -14,12 +14,12 @@ on:
   release:
     types: [published, created, edited]
 jobs:
-  ubuntu-jammy:
-    runs-on: ubuntu-22.04
+  ubuntu-24_04:
+    runs-on: ubuntu-24.04
     strategy:
       fail-fast: false
       matrix:
-        compiler: [ g++-11, g++-12, clang++-14 ]
+        compiler: [ g++-12, g++-13, clang++-15 clang++-16 ]
         standard: [ c++03, c++11, c++14, c++17, c++2a, gnu++03, gnu++11, gnu++14, gnu++17, gnu++2a ]
     steps:
       - uses: actions/checkout@v2
@@ -47,7 +47,7 @@ jobs:
         if: steps.retry1.outcome=='failure'
         run: sudo apt-add-repository -y "ppa:ubuntu-toolchain-r/test"
       - name: Install packages
-        run: sudo apt install g++-11 g++-12 clang-14
+        run: sudo apt install g++-12 g++-13 clang-15 clang-16
       - name: Checkout main boost
         run: git clone -b develop --depth 1 https://github.com/boostorg/boost.git ../boost-root
       - name: Update tools/boostdep
@@ -140,76 +140,13 @@ jobs:
       - name: Test
         run: ../../../b2 toolset=$TOOLSET
         working-directory: ../boost-root/libs/type_traits/test
-  ubuntu-focal:
-    runs-on: ubuntu-20.04
-    strategy:
-      fail-fast: false
-      matrix:
-        compiler: [ g++-9, g++-10, clang++-9, clang++-10 ]
-        standard: [ c++03, c++11, c++14, c++17, c++2a, gnu++03, gnu++11, gnu++14, gnu++17, gnu++2a ]
-    steps:
-      - uses: actions/checkout@v2
-        with:
-          fetch-depth: '0'
-      - uses: mstachniuk/ci-skip@v1
-        with:
-          commit-filter: '[skip ci];[ci skip];[CI SKIP];[SKIP CI];***CI SKIP***;***SKIP CI***;[windows];[Windows];[WINDOWS];[apple];[Apple];[APPLE]'
-          commit-filter-separator: ';'
-          fail-fast: true
-      - name: Set TOOLSET
-        run: echo ${{ matrix.compiler }} | awk '/^g/ { print "TOOLSET=gcc" } /^clang/ { print "TOOLSET=clang" }' >> $GITHUB_ENV
-      - name: Add repository
-        continue-on-error: true
-        id: addrepo
-        run: sudo apt-add-repository -y "ppa:ubuntu-toolchain-r/test"
-      - name: Retry Add Repo
-        continue-on-error: true
-        id: retry1
-        if: steps.addrepo.outcome=='failure'
-        run: sudo apt-add-repository -y "ppa:ubuntu-toolchain-r/test"
-      - name: Retry Add Repo 2
-        continue-on-error: true
-        id: retry2
-        if: steps.retry1.outcome=='failure'
-        run: sudo apt-add-repository -y "ppa:ubuntu-toolchain-r/test"
-      - name: Install packages
-        run: sudo apt install g++-9 g++-10 clang-9 clang-10
-      - name: Checkout main boost
-        run: git clone -b develop --depth 1 https://github.com/boostorg/boost.git ../boost-root
-      - name: Update tools/boostdep
-        run: git submodule update --init tools/boostdep
-        working-directory: ../boost-root
-      - name: Copy files
-        run: cp -r $GITHUB_WORKSPACE/* libs/type_traits
-        working-directory: ../boost-root
-      - name: Install deps
-        run: python tools/boostdep/depinst/depinst.py type_traits
-        working-directory: ../boost-root
-      - name: Bootstrap
-        run: ./bootstrap.sh
-        working-directory: ../boost-root
-      - name: Generate headers
-        run: ./b2 headers
-        working-directory: ../boost-root
-      - name: Generate user config
-        run: 'echo "using $TOOLSET : : ${{ matrix.compiler }} : <cxxflags>-std=${{ matrix.standard }} ;" > ~/user-config.jam'
-        working-directory: ../boost-root
-      - name: Config info install
-        run: ../../../b2 config_info_travis_install toolset=$TOOLSET
-        working-directory: ../boost-root/libs/config/test
-      - name: Config info
-        run: ./config_info_travis
-        working-directory: ../boost-root/libs/config/test
-      - name: Test
-        run: ../../../b2 toolset=$TOOLSET
-        working-directory: ../boost-root/libs/type_traits/test
   macos:
     runs-on: macos-latest
     strategy:
       fail-fast: false
       matrix:
         toolset: [ clang ]
-        standard: [ "03", 11, 14, 17, 2a ]
+        standard: [ "03", 11, 14, 17, 20 ]
     steps:
       - uses: actions/checkout@v2
         with:
@@ -467,79 +404,3 @@ jobs:
       - name: Test
         run: ..\..\..\b2 --hash cxxstd=${{ matrix.standard }} toolset=msvc-14.2 define=CI_SUPPRESS_KNOWN_ISSUES cxxflags=-clr asynch-exceptions=on
         working-directory: ../boost-root/libs/type_traits/test
-  ubuntu-cuda:
-    runs-on: ubuntu-20.04
-    strategy:
-      fail-fast: false
-      matrix:
-        standard: [ 11, 14, 17 ]
-    steps:
-      - uses: actions/checkout@v2
-        with:
-          fetch-depth: '0'
-      - uses: Jimver/cuda-toolkit@v0.2.4
-      - uses: mstachniuk/ci-skip@v1
-        with:
-          commit-filter: '[skip ci];[ci skip];[CI SKIP];[SKIP CI];***CI SKIP***;***SKIP CI***;[windows];[Windows];[WINDOWS];[apple];[Apple];[APPLE]'
-          commit-filter-separator: ';'
-          fail-fast: true
-      - name: Add repository
-        continue-on-error: true
-        id: addrepo
-        run: sudo apt-add-repository -y "ppa:ubuntu-toolchain-r/test"
-      - name: Retry Add Repo
-        continue-on-error: true
-        id: retry1
-        if: steps.addrepo.outcome=='failure'
-        run: sudo apt-add-repository -y "ppa:ubuntu-toolchain-r/test"
-      - name: Retry Add Repo 2
-        continue-on-error: true
-        id: retry2
-        if: steps.retry1.outcome=='failure'
-        run: sudo apt-add-repository -y "ppa:ubuntu-toolchain-r/test"
-      - name: Install packages
-        run: sudo apt install clang-10
-      - name: Checkout main boost
-        run: git clone -b develop --depth 1 https://github.com/boostorg/boost.git ../boost-root
-      - name: Update tools/boostdep
-        run: git submodule update --init tools/boostdep
-        working-directory: ../boost-root
-      - name: Copy files
-        run: cp -r $GITHUB_WORKSPACE/* libs/type_traits
-        working-directory: ../boost-root
-      - name: Install deps
-        run: python tools/boostdep/depinst/depinst.py type_traits
-        working-directory: ../boost-root
-      - name: Bootstrap
-        run: ./bootstrap.sh
-        working-directory: ../boost-root
-      - name: Generate headers
-        run: ./b2 headers
-        working-directory: ../boost-root
-      - name: nvcc version
-        run: nvcc --version
-        working-directory: ../boost-root/libs/config/test
-      - name: Testing nvcc
-        run: for file in $(cat cuda/cuda_tests.txt); do echo "testing $file.cpp" && nvcc -std=c++${{ matrix.standard }} -I../../.. -c -DTEST_VIA_STATIC_ASSERT $file.cpp || break -1; done
-        working-directory: ../boost-root/libs/type_traits/test
-      - name: Testing nvcc+clang
-        run: for file in $(cat cuda/cuda_tests.txt); do echo "testing $file.cpp" && nvcc --compiler-bindir=clang++ -std=c++${{ matrix.standard }} -I../../.. -c -DTEST_VIA_STATIC_ASSERT $file.cpp || break -1; done
-        working-directory: ../boost-root/libs/type_traits/test
-      - name: Create .cu files
-        run: for file in $(cat cuda/cuda_tests.txt); do cp $file.cpp $file.cu; done
-        working-directory: ../boost-root/libs/type_traits/test
-      - name: Testing nvcc on .cu files
-        run: for file in $(cat cuda/cuda_tests.txt); do echo "testing $file.cu" && nvcc -std=c++${{ matrix.standard }} -I../../.. -c -DTEST_VIA_STATIC_ASSERT $file.cu || break -1; done
-        working-directory: ../boost-root/libs/type_traits/test
-      - name: Testing nvcc+clang on .cu files
-        run: for file in $(cat cuda/cuda_tests.txt); do echo "testing $file.cu" && nvcc --compiler-bindir=clang++ -std=c++${{ matrix.standard }} -I../../.. -c -DTEST_VIA_STATIC_ASSERT $file.cu || break -1; done
-        working-directory: ../boost-root/libs/type_traits/test
-      - name: Testing clang on .cu files
-        run: for file in $(cat cuda/cuda_tests.txt); do echo "testing $file.cu" && clang++ -nocudalib --no-cuda-version-check --cuda-gpu-arch=sm_75 -std=c++${{ matrix.standard }} -I../../.. -c -DTEST_VIA_STATIC_ASSERT $file.cu || break -1; done
-        working-directory: ../boost-root/libs/type_traits/test
-      - name: Testing nvcc on .cu files
-        run: for file in $(cat cuda/cuda_tests.txt); do echo "testing $file.cu" && nvcc -std=c++${{ matrix.standard }} -I../../.. -c -DTEST_CUDA_DEVICE $file.cu || break -1; done
-        working-directory: ../boost-root/libs/type_traits/test
-      - name: Testing clang on .cu files
-        run: for file in $(cat cuda/cuda_tests.txt); do echo "testing $file.cu" && clang++ -nocudalib --no-cuda-version-check --cuda-gpu-arch=sm_75 -std=c++${{ matrix.standard }} -I../../.. -c -DTEST_CUDA_DEVICE $file.cu || break -1; done
-        working-directory: ../boost-root/libs/type_traits/test