diff --git a/stac_fastapi/types/setup.py b/stac_fastapi/types/setup.py
index 85f4e6c1f..1b357a7db 100644
--- a/stac_fastapi/types/setup.py
+++ b/stac_fastapi/types/setup.py
@@ -11,7 +11,7 @@
     "pydantic[dotenv]",
     "stac_pydantic==2.0.*",
     "pystac==1.*",
-    "iso8601~=1.0.2",
+    "iso8601>=1.0.2,<1.2.0",
 ]
 
 extra_reqs = {