diff --git a/tap_jotform/client.py b/tap_jotform/client.py
index 0cff99d..17983b5 100644
--- a/tap_jotform/client.py
+++ b/tap_jotform/client.py
@@ -36,7 +36,7 @@ class JotformStream(RESTStream):
     """Jotform stream class."""
 
     page_size = 100
-    primary_keys = ["id"]
+    primary_keys: list[str] | None = ["id"]
     records_jsonpath = "$.content[*]"
 
     INTEGER_FIELDS: list[str] = []
diff --git a/tap_jotform/streams.py b/tap_jotform/streams.py
index 2ed4f55..c5fcb95 100644
--- a/tap_jotform/streams.py
+++ b/tap_jotform/streams.py
@@ -246,6 +246,7 @@ class UserHistory(JotformStream):
 
     name = "user_history"
     path = "/user/history"
+    primary_keys = None
 
     schema = th.PropertiesList(
         th.Property(