diff --git a/src/pyobo/reader.py b/src/pyobo/reader.py
index bdfe9e30..168f6407 100644
--- a/src/pyobo/reader.py
+++ b/src/pyobo/reader.py
@@ -97,7 +97,7 @@ def _read_obo(filelike, prefix: str | None, ignore_obsolete: bool) -> nx.MultiDi
         tqdm(
             filelike,
             unit_scale=True,
-            desc=f'[{prefix or ""}] parsing OBO',
+            desc=f"[{prefix or ''}] parsing OBO",
             disable=None,
             leave=True,
         ),
diff --git a/src/pyobo/sources/icd11.py b/src/pyobo/sources/icd11.py
index b520de0b..fe91ca8a 100644
--- a/src/pyobo/sources/icd11.py
+++ b/src/pyobo/sources/icd11.py
@@ -86,7 +86,7 @@ def iterate_icd11_helper(res_json, version) -> Iterable[Term]:
     with top_path.open("w") as file:
         json.dump(res_json, file, indent=2)
 
-    tqdm.write(f'There are {len(res_json["child"])} top level entities')
+    tqdm.write(f"There are {len(res_json['child'])} top level entities")
 
     visited_identifiers: set[str] = set()
     for identifier in get_child_identifiers(ICD11_TOP_LEVEL_URL, res_json):