diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 78249584..c97a04ab 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -3,9 +3,9 @@ name: CI
 on: [push, pull_request]
 
 jobs:
-  macos14:
-    name: "macOS 14"
-    runs-on: macos-14
+  macos15:
+    name: "macOS 15"
+    runs-on: macos-15
     if: "!contains(github.event.head_commit.message, '[skip ci]')"
     env:
       SKBUILD_CMAKE_ARGS: "-DEXTRA_WARNINGS=ON;-DFETCH_ZLIB_NG=ON"
@@ -31,14 +31,14 @@ jobs:
         (cd docs && sphinx-build -M doctest . _build -n -E)
     - uses: actions/upload-artifact@v4
       with:
-        name: gemmi-macos14
+        name: gemmi-macos15
         path: |
           ./gemmi-*.whl
         retention-days: 14
 
-  macos12:
-    name: "macOS 12 (w/o python)"
-    runs-on: macos-12
+  macos13:
+    name: "macOS 13 (w/o python)"
+    runs-on: macos-13
     if: "!contains(github.event.head_commit.message, '[skip ci]')"
     steps:
     - uses: actions/checkout@v4
@@ -62,7 +62,7 @@ jobs:
         python3 tests/test_prog.py
     - uses: actions/upload-artifact@v4
       with:
-        name: gemmi-macos12
+        name: gemmi-macos13
         path: |
           ${{runner.workspace}}/build/gemmi
           ${{runner.workspace}}/build/libgemmi*
diff --git a/.github/workflows/testwheel.yml b/.github/workflows/testwheel.yml
index 50767d82..f9eaa5d4 100644
--- a/.github/workflows/testwheel.yml
+++ b/.github/workflows/testwheel.yml
@@ -12,9 +12,9 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu-20.04, ubuntu-22.04,
+        os: [ubuntu-20.04, ubuntu-22.04, ubuntu-24.04,
              windows-latest,
-             macos-12, macos-13, macos-14]
+             macos-12, macos-13, macos-14, macos-15]
         py: ['3.8', '3.9', '3.10', '3.11', '3.12']
     name: ${{ matrix.os }} py${{ matrix.py }}
     runs-on: ${{ matrix.os }}
diff --git a/.github/workflows/wheels2.yml b/.github/workflows/wheels2.yml
index 556e622f..dac92b23 100644
--- a/.github/workflows/wheels2.yml
+++ b/.github/workflows/wheels2.yml
@@ -24,13 +24,13 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        os: [ubuntu-22.04, windows-2022, macos-12, macos-14]
+        os: [ubuntu-22.04, windows-2022, macos-13, macos-14]
 
     steps:
     - uses: actions/checkout@v4
 
     - name: Build wheels
-      uses: pypa/cibuildwheel@v2.21.3
+      uses: pypa/cibuildwheel@v2.22.0
       env:
         CIBW_BUILD: ${{ github.event.inputs.cibw_build }}
         CIBW_SKIP: ${{ github.event.inputs.cibw_skip }}