diff --git a/.github/workflows/build.yaml b/.github/workflows/build.yaml
index d80e4ca..c3afaa1 100644
--- a/.github/workflows/build.yaml
+++ b/.github/workflows/build.yaml
@@ -40,7 +40,7 @@ jobs:
             cibw_archs_macos: x86_64
             cibw_environment: >
               APNGASM_COMPILE_TARGET=x64
-              _PYTHON_HOST_PLATFORM=macosx-10.15-x86_64
+              _PYTHON_HOST_PLATFORM=macosx-10_15-x86_64
               VCPKG_OSX_DEPLOYMENT_TARGET=10.15
               MACOSX_DEPLOYMENT_TARGET=10.15
               CMAKE_OSX_DEPLOYMENT_TARGET=10.15
@@ -53,7 +53,7 @@ jobs:
             cibw_archs_macos: arm64
             cibw_environment: >
               APNGASM_COMPILE_TARGET=arm64
-              _PYTHON_HOST_PLATFORM=macosx-11.0-arm64
+              _PYTHON_HOST_PLATFORM=macosx-11_0-arm64
               VCPKG_OSX_DEPLOYMENT_TARGET=11.0
               MACOSX_DEPLOYMENT_TARGET=11.0
               CMAKE_OSX_DEPLOYMENT_TARGET=11.0