diff --git a/.github/workflows/wheel-build.yml b/.github/workflows/wheel-build.yml
index d766c0d9..fc5f1254 100644
--- a/.github/workflows/wheel-build.yml
+++ b/.github/workflows/wheel-build.yml
@@ -52,7 +52,7 @@ jobs:
         LD_LIBRARY_PATH=$CMOR_DEPS_PREFIX/lib auditwheel repair --plat manylinux_2_28_x86_64 -w {dest_dir} {wheel}
       CIBW_REPAIR_WHEEL_COMMAND_MACOS: >-
         DYLD_FALLBACK_LIBRARY_PATH=$CMOR_DEPS_PREFIX/lib delocate-wheel --require-archs {delocate_archs} -w {dest_dir} -v {wheel}
-      CIBW_TEST_REQUIRES: "numpy typing-extensions netcdf4 pyfive hdf5plugin"
+      CIBW_TEST_REQUIRES: "numpy typing-extensions netcdf4 pyfive fsspec hdf5plugin"
       CIBW_TEST_COMMAND: "CMOR_WHEEL_ALREADY_INSTALLED=1 CMOR_TEST_DEPS_ALREADY_INSTALLED=1 bash {project}/ci-support/test-wheel.sh"
       WHEEL_DIR: ${{ github.workspace }}/wheelhouse
     steps: