diff --git a/kazu/ontology_preprocessing/base.py b/kazu/ontology_preprocessing/base.py
index b30062ce..15277182 100644
--- a/kazu/ontology_preprocessing/base.py
+++ b/kazu/ontology_preprocessing/base.py
@@ -100,7 +100,7 @@ def __init__(
         curations_path: Optional[PathLike] = None,
         global_actions: Optional[GlobalParserActions] = None,
         ontology_downloader: Optional[OntologyDownloader] = None,
-    ):
+    ) -> None:
         """
 
         :param in_path: Path to some resource that should be processed (e.g. owl file, db config, tsv etc)
diff --git a/kazu/ontology_preprocessing/parsers.py b/kazu/ontology_preprocessing/parsers.py
index 501ae21b..e3468017 100644
--- a/kazu/ontology_preprocessing/parsers.py
+++ b/kazu/ontology_preprocessing/parsers.py
@@ -480,7 +480,7 @@ def __init__(
         in_path: PathLike,
         entity_class: str,
         name: str,
-        uri_regex: Union[str, re.Pattern],
+        uri_regex: Union[str, re.Pattern[str]],
         synonym_predicates: Iterable[RdfRef],
         string_scorer: Optional[StringSimilarityScorer] = None,
         synonym_merge_threshold: float = 0.7,
@@ -493,7 +493,7 @@ def __init__(
         global_actions: Optional[GlobalParserActions] = None,
         ontology_downloader: Optional[OntologyDownloader] = None,
         label_predicate: RdfRef = rdflib.RDFS.label,
-    ):
+    ) -> None:
         super().__init__(
             in_path=in_path,
             entity_class=entity_class,
@@ -641,7 +641,7 @@ def __init__(
         in_path: PathLike,
         entity_class: str,
         name: str,
-        uri_regex: Union[str, re.Pattern],
+        uri_regex: Union[str, re.Pattern[str]],
         synonym_predicates: Iterable[RdfRef] = (SKOS_XL_ALT_LABEL_PATH,),
         string_scorer: Optional[StringSimilarityScorer] = None,
         synonym_merge_threshold: float = 0.7,
@@ -654,7 +654,7 @@ def __init__(
         global_actions: Optional[GlobalParserActions] = None,
         ontology_downloader: Optional[OntologyDownloader] = None,
         label_predicate: RdfRef = SKOS_XL_PREF_LABEL_PATH,
-    ):
+    ) -> None:
         super().__init__(
             in_path=in_path,
             entity_class=entity_class,
@@ -710,7 +710,7 @@ def __init__(
         curations_path: Optional[PathLike] = None,
         global_actions: Optional[GlobalParserActions] = None,
         ontology_downloader: Optional[OntologyDownloader] = None,
-    ):
+    ) -> None:
         super().__init__(
             in_path=in_path,
             entity_class=entity_class,
@@ -793,7 +793,7 @@ def __init__(
         curations_path: Optional[PathLike] = None,
         global_actions: Optional[GlobalParserActions] = None,
         ontology_downloader: Optional[OntologyDownloader] = None,
-    ):
+    ) -> None:
         super().__init__(
             in_path=in_path,
             entity_class=entity_class,
@@ -833,7 +833,7 @@ def __init__(
         curations_path: Optional[PathLike] = None,
         global_actions: Optional[GlobalParserActions] = None,
         ontology_downloader: Optional[OntologyDownloader] = None,
-    ):
+    ) -> None:
         super().__init__(
             in_path=in_path,
             entity_class=entity_class,
@@ -873,7 +873,7 @@ def __init__(
         curations_path: Optional[PathLike] = None,
         global_actions: Optional[GlobalParserActions] = None,
         ontology_downloader: Optional[OntologyDownloader] = None,
-    ):
+    ) -> None:
         super().__init__(
             in_path=in_path,
             entity_class=entity_class,
@@ -913,7 +913,7 @@ def __init__(
         curations_path: Optional[PathLike] = None,
         global_actions: Optional[GlobalParserActions] = None,
         ontology_downloader: Optional[OntologyDownloader] = None,
-    ):
+    ) -> None:
 
         super().__init__(
             in_path=in_path,
@@ -1013,7 +1013,7 @@ def __init__(
         curations_path: Optional[PathLike] = None,
         global_actions: Optional[GlobalParserActions] = None,
         ontology_downloader: Optional[OntologyDownloader] = None,
-    ):
+    ) -> None:
         super().__init__(
             in_path=in_path,
             entity_class=entity_class,
@@ -1160,7 +1160,7 @@ def __init__(
         curations_path: Optional[PathLike] = None,
         global_actions: Optional[GlobalParserActions] = None,
         ontology_downloader: Optional[OntologyDownloader] = None,
-    ):
+    ) -> None:
         super().__init__(
             in_path=in_path,
             entity_class=entity_class,
@@ -1296,7 +1296,7 @@ def __init__(
             "Social circumstances",
             "Investigations",
         ),
-    ):
+    ) -> None:
         super().__init__(
             in_path=in_path,
             entity_class=entity_class,
@@ -1448,7 +1448,7 @@ def __init__(
         curations_path: Optional[PathLike] = None,
         global_actions: Optional[GlobalParserActions] = None,
         ontology_downloader: Optional[OntologyDownloader] = None,
-    ):
+    ) -> None:
 
         super().__init__(
             in_path=in_path,
@@ -1547,7 +1547,7 @@ def __init__(
         global_actions: Optional[GlobalParserActions] = None,
         ontology_downloader: Optional[OntologyDownloader] = None,
         **kwargs: Any,
-    ):
+    ) -> None:
         """
 
         :param in_path:
@@ -1612,7 +1612,7 @@ def __init__(
         curations_path: Optional[PathLike] = None,
         global_actions: Optional[GlobalParserActions] = None,
         ontology_downloader: Optional[OntologyDownloader] = None,
-    ):
+    ) -> None:
         super().__init__(
             in_path=in_path,
             entity_class=entity_class,
@@ -1682,7 +1682,7 @@ def __init__(
         curations_path: Optional[PathLike] = None,
         global_actions: Optional[GlobalParserActions] = None,
         ontology_downloader: Optional[OntologyDownloader] = None,
-    ):
+    ) -> None:
 
         super().__init__(
             in_path=in_path,
diff --git a/pyproject.toml b/pyproject.toml
index 416554be..d475f59c 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -241,13 +241,11 @@ module = [
   "kazu.utils.build_and_test_model_packs",                             # 2
   "kazu.steps.ner.hf_token_classification",                            # 2
   "kazu.steps.linking.post_processing.disambiguation.strategies",      # 2
-  "kazu.ontology_preprocessing.parsers",                               # 2
   "kazu.annotation.acceptance_test",                                   # 2
   "kazu.utils.string_normalizer",                                      # 1
   "kazu.steps.linking.post_processing.disambiguation.context_scoring", # 1
   "kazu.steps.linking.entity_class_disambiguation",                    # 1
   "kazu.pipeline",                                                     # 1
-  "kazu.ontology_preprocessing.base",                                  # 1
   "kazu.ontology_matching.ontology_matcher",                           # 1
 ]
 # as above, we want this to be true for files it can be, especially new files.