diff --git a/api-client/setup.py b/api-client/setup.py
index fc4e05c39..02e8f60d8 100644
--- a/api-client/setup.py
+++ b/api-client/setup.py
@@ -21,6 +21,7 @@ setup(
     extras_require={
         "dev": [
             "requests-mock",
+            "types-python-dateutil",
             "types-requests",
         ],
     },