diff --git a/CMakeLists.txt b/CMakeLists.txt
index 729384b..8817b45 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -83,9 +83,9 @@ set_target_properties(manifold PROPERTIES LINKER_LANGUAGE CXX)
 target_include_directories(manifold PUBLIC ${MANIFOLD_SRC_DIR})
 target_include_directories(manifold PRIVATE ${EXTERNAL_DEP_DIR}/manifold/3rd)
 if (CMAKE_BUILD_TYPE STREQUAL "Debug")
-    target_compile_options(manifold PRIVATE "${CMAKE_CXX_FLAGS} -Wall -pthread -DWITH_OMP  -Wno-int-in-bool-context -Wsign-compare -fsanitize=address")
+    target_compile_options(manifold PRIVATE -Wall -pthread -DWITH_OMP -Wno-int-in-bool-context -Wsign-compare -fsanitize=address)
 else()
-    target_compile_options(manifold PRIVATE "${CMAKE_CXX_FLAGS} -DWITH_OMP ")
+    target_compile_options(manifold PRIVATE -DWITH_OMP)
 endif()
 
 
diff --git a/pyproject.toml b/pyproject.toml
index caa7584..a1a499a 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,3 +1,3 @@
 [build-system]
-requires = ["setuptools>=42", "wheel", "scipy", "numpy", "cmake>=3.2"]
+requires = ["setuptools>=42", "wheel", "scipy", "numpy", "cmake>=3.2,<4"]
 build-backend = "setuptools.build_meta"
diff --git a/src/common/ply_loader.h b/src/common/ply_loader.h
index 765f806..dafacd3 100644
--- a/src/common/ply_loader.h
+++ b/src/common/ply_loader.h
@@ -74,7 +74,7 @@ pybind11::array ply_data_to_array(std::shared_ptr<tinyply::PlyData> attrib) {
     if (attrib->count == 0) {
         return pybind11::array(attrib_dtype, std::vector<size_t>({0, 0}));
     }
-    size_t bytes_per_scalar = attrib_dtype.elsize();
+    size_t bytes_per_scalar = attrib_dtype.itemsize();
     if (bytes_per_scalar <= 0) {
         throw std::runtime_error("Internal PLY loading error. Type has no defined byte size.");
     }