diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 288b00800..62e8a61a5 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -15,12 +15,16 @@ on:
   release:
     types: [published, created, edited]
 
+concurrency:
+  group: ${{format('{0}:{1}', github.repository, github.ref)}}
+  cancel-in-progress: true
+
 env:
   UBSAN_OPTIONS: print_stacktrace=1
 
 jobs:
   ubuntu-jammy:
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-24.04
     strategy:
       fail-fast: false
       matrix:
@@ -32,8 +36,6 @@ jobs:
           fetch-depth: '0'
       - name: Set TOOLSET
         run: echo ${{ matrix.compiler }} | awk '/^g/ { print "TOOLSET=gcc" } /^clang/ { print "TOOLSET=clang" }' >> $GITHUB_ENV
-      - name: Add repository
-        run: sudo apt-add-repository -y "ppa:ubuntu-toolchain-r/test"
       - name: Install packages
         run: sudo apt install g++-11 g++-12 g++-13
       - name: Checkout main boost
@@ -75,8 +77,6 @@ jobs:
           fetch-depth: '0'
       - name: Set TOOLSET
         run: echo ${{ matrix.compiler }} | awk '/^g/ { print "TOOLSET=gcc" } /^clang/ { print "TOOLSET=clang" }' >> $GITHUB_ENV
-      - name: Add repository
-        run: sudo apt-add-repository -y "ppa:ubuntu-toolchain-r/test"
       - name: Install packages
         run: sudo apt install libicu-dev
       - name: Test
@@ -95,8 +95,6 @@ jobs:
           fetch-depth: '0'
       - name: Set TOOLSET
         run: echo ${{ matrix.compiler }} | awk '/^g/ { print "TOOLSET=gcc" } /^clang/ { print "TOOLSET=clang" }' >> $GITHUB_ENV
-      - name: Add repository
-        run: sudo apt-add-repository -y "ppa:ubuntu-toolchain-r/test"
       - name: Install packages
         run: sudo apt install clang-15
       - name: Checkout main boost
@@ -126,7 +124,7 @@ jobs:
         run: ../../../b2 toolset=$TOOLSET define=CI_SUPPRESS_KNOWN_ISSUES define=SLOW_COMPILER
         working-directory: ../boost-root/libs/regex/test
   ubuntu-jammy-clang-18-modules:
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-24.04
     steps:
       - uses: actions/checkout@v6
         with:
@@ -168,8 +166,6 @@ jobs:
           fetch-depth: '0'
       - name: Set TOOLSET
         run: echo ${{ matrix.compiler }} | awk '/^g/ { print "TOOLSET=gcc" } /^clang/ { print "TOOLSET=clang" }' >> $GITHUB_ENV
-      - name: Add repository
-        run: sudo apt-add-repository -y "ppa:ubuntu-toolchain-r/test"
       - name: Install packages
         run: sudo apt install clang-16 clang-17 clang-18
       - name: Checkout main boost