diff --git a/pyproject.toml b/pyproject.toml
index 896996f..ae9f818 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -83,7 +83,8 @@ skip = ["*-win32", "*-manylinux_i686", "*-musllinux*", "pp*"]
 
 # Set the environment variable for the wheel build step.
 # NOTE(haocheng): we enable all the optional features for the wheel build.
-environment = { LCS_BUILD_DIR = "{project}/src/libCacheSim/build", MACOSX_DEPLOYMENT_TARGET = "14.0", CMAKE_ARGS = "-DENABLE_3L_CACHE=ON -DENABLE_GLCACHE=ON -DENABLE_LRB=ON" }
+# And MACOSX_DEPLOYMENT_TARGET should be kept in sync with [tool.scikit-build.cmake].define.CMAKE_OSX_DEPLOYMENT_TARGET
+environment = { LCS_BUILD_DIR = "{project}/src/libCacheSim/build", MACOSX_DEPLOYMENT_TARGET = "15.0", CMAKE_ARGS = "-DENABLE_3L_CACHE=ON -DENABLE_GLCACHE=ON -DENABLE_LRB=ON" }
 
 # Test that the wheel can be imported
 test-command = "python -c 'import libcachesim; print(\"Import successful\")'; cp -r {project}/tests .; python -m pytest tests/ -v -m 'not optional'; python -m pytest tests/ -v -m 'optional'"