diff --git a/pyproject.toml b/pyproject.toml
index b9c5a54..06fb3ac 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -87,6 +87,7 @@ environment = """ \
     CXXFLAGS="-I${BOOST_INSTALL_DIR}/include -L${BOOST_INSTALL_DIR}/lib" \
     FC=gfortran \
     LD_LIBRARY_PATH="${BOOST_INSTALL_DIR}/lib" \
+    MACOSX_DEPLOYMENT_TARGET="13.0" \
 """
 test-command = "cd {package}/test && python tbdsf_process_image.py"