diff --git a/pyproject.toml b/pyproject.toml
index a5ea3558..b8cc9303 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -21,8 +21,8 @@ classifiers = [
 ]
 dependencies = [
     "findiff>=0.11.1",
-    "pynxtools>=0.11.1",
-    # "pynxtools @ git+https://github.com/FAIRmat-NFDI/pynxtools.git@hdf-based-validation#egg=pynxtools",
+    # "pynxtools>=0.11.1",
+    "pynxtools @ git+https://github.com/FAIRmat-NFDI/pynxtools.git@666-bug-validation-of-open-enumerations-does-not-search-for-custom-attribute#egg=pynxtools",
 ]
 
 # TODO: Add acknowledgements to pySPM python package
diff --git a/tests/data/nanonis/afm/version_gen_4_default_config/afm_4_default_config.nxs b/tests/data/nanonis/afm/version_gen_4_default_config/afm_4_default_config.nxs
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diff --git a/tests/data/nanonis/afm/version_gen_4_with_described_nxdata/afm_4_described_nxdata.nxs b/tests/data/nanonis/afm/version_gen_4_with_described_nxdata/afm_4_described_nxdata.nxs
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diff --git a/tests/data/nanonis/stm/version_gen_4_5_default_config/stm_4_5_with_default_config.nxs b/tests/data/nanonis/stm/version_gen_4_5_default_config/stm_4_5_with_default_config.nxs
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diff --git a/tests/data/nanonis/stm/version_gen_4_5_with_described_nxdata/stm_4_5_described_nxdata.nxs b/tests/data/nanonis/stm/version_gen_4_5_with_described_nxdata/stm_4_5_described_nxdata.nxs
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diff --git a/tests/data/nanonis/stm/version_gen_5_with_described_nxdata/stm_5_with_described_nxdata.nxs b/tests/data/nanonis/stm/version_gen_5_with_described_nxdata/stm_5_with_described_nxdata.nxs
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diff --git a/tests/data/nanonis/stm/version_gen_5e_with_described_nxdata/stm_5e_with_described_nxdata.nxs b/tests/data/nanonis/stm/version_gen_5e_with_described_nxdata/stm_5e_with_described_nxdata.nxs
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diff --git a/tests/data/nanonis/sts/version_gen_5_with_described_nxdata/sts_5_described_nxdata.nxs b/tests/data/nanonis/sts/version_gen_5_with_described_nxdata/sts_5_described_nxdata.nxs
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diff --git a/tests/data/nanonis/sts/version_gen_5e_default_config/sts_5e_default_config.nxs b/tests/data/nanonis/sts/version_gen_5e_default_config/sts_5e_default_config.nxs
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diff --git a/tests/data/nanonis/sts/version_gen_5e_with_described_nxdata/sts_5e_described_nxdata.nxs b/tests/data/nanonis/sts/version_gen_5e_with_described_nxdata/sts_5e_described_nxdata.nxs
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