diff --git a/flareio/api_client.py b/flareio/api_client.py
index 290e099..263d994 100644
--- a/flareio/api_client.py
+++ b/flareio/api_client.py
@@ -47,18 +47,21 @@ def _create_session() -> requests.Session:
             ),
         )
 
+        retry = Retry(
+            total=5,
+            backoff_factor=2,
+            status_forcelist=[429, 502, 503, 504],
+            allowed_methods={"GET", "POST"},
+        )
+
+        # Support for urllib3 < 2.X
+        if hasattr(Retry, "backoff_max"):
+            retry.backoff_max = 15
+
         # Enable retries
         session.mount(
             "https://",
-            HTTPAdapter(
-                max_retries=Retry(
-                    total=5,
-                    backoff_factor=2,
-                    status_forcelist=[429, 502, 503, 504],
-                    allowed_methods={"GET", "POST"},
-                    backoff_max=15,
-                )
-            ),
+            HTTPAdapter(max_retries=retry),
         )
 
         return session