diff --git a/src/pyobo/api/names.py b/src/pyobo/api/names.py
index a2cd003a..18319fd5 100644
--- a/src/pyobo/api/names.py
+++ b/src/pyobo/api/names.py
@@ -40,8 +40,8 @@ def get_name_by_curie(curie: str, *, version: Optional[str] = None) -> Optional[
 
 X = TypeVar("X")
 
-NO_BUILD_PREFIXES = set()
-NO_BUILD_LOGGED = set()
+NO_BUILD_PREFIXES: Set[str] = set()
+NO_BUILD_LOGGED: Set = set()
 
 
 def _help_get(
diff --git a/src/pyobo/sources/rgd.py b/src/pyobo/sources/rgd.py
index ef81aba1..d1871257 100644
--- a/src/pyobo/sources/rgd.py
+++ b/src/pyobo/sources/rgd.py
@@ -28,7 +28,7 @@
 
 # NOTE unigene id was discontinue in January 18th, 2021 dump
 
-GENES_URL = "https://download.rgd.mcw.edu/data_release/GENES.RAT.txt"
+GENES_URL = "https://download.rgd.mcw.edu/data_release/GENES_RAT.txt"
 GENES_HEADER = [
     "GENE_RGD_ID",
     "SYMBOL",
diff --git a/src/pyobo/xrefdb/sources/wikidata.py b/src/pyobo/xrefdb/sources/wikidata.py
index 93db2a54..12069e92 100644
--- a/src/pyobo/xrefdb/sources/wikidata.py
+++ b/src/pyobo/xrefdb/sources/wikidata.py
@@ -92,6 +92,7 @@ def _removeprefix(s, prefix):
         return s[len(prefix) :]
     return s
 
+
 HEADERS = {
     "User-Agent": f"pyobo/{get_version()}",
 }