diff --git a/.github/workflows/build_wheels.yml b/.github/workflows/build_wheels.yml
index b4d0002..a73f336 100644
--- a/.github/workflows/build_wheels.yml
+++ b/.github/workflows/build_wheels.yml
@@ -28,7 +28,7 @@ jobs:
       #   uses: docker/setup-qemu-action@v3
       #   with:
       #     platforms: all
-      - uses: pypa/cibuildwheel@v2.21.1
+      - uses: pypa/cibuildwheel@v2.21.3
         env:
           # Building and testing manylinux2014_aarch64 too is slow.
           # See https://github.com/phasorpy/phasorpy/pull/135
diff --git a/.github/workflows/run-tests.yml b/.github/workflows/run-tests.yml
index 12500fd..3d4408e 100644
--- a/.github/workflows/run-tests.yml
+++ b/.github/workflows/run-tests.yml
@@ -87,7 +87,7 @@ jobs:
         os: ["ubuntu-22.04", "windows-2019", "macos-12"]
     steps:
       - uses: actions/checkout@v4
-      - uses: pypa/cibuildwheel@v2.21.1
+      - uses: pypa/cibuildwheel@v2.21.3
         env:
           # CIBW_ENVIRONMENT: "PIP_PRE=1"
           CIBW_BUILD_VERBOSITY: 3
@@ -115,7 +115,7 @@ jobs:
   #        uses: docker/setup-qemu-action@v3
   #        with:
   #          platforms: all
-  #      - uses: pypa/cibuildwheel@v2.21.1
+  #      - uses: pypa/cibuildwheel@v2.21.3
   #        env:
   #          CIBW_ARCHS_LINUX: aarch64
   #          CIBW_BUILD_VERBOSITY: 2