diff --git a/pcstac/requirements.txt b/pcstac/requirements.txt
index a9000342..65feeaee 100644
--- a/pcstac/requirements.txt
+++ b/pcstac/requirements.txt
@@ -2,7 +2,7 @@
 # This file is autogenerated by pip-compile with Python 3.9
 # by the following command:
 #
-#    pip-compile --extra=server --output-file=pcstac/requirements.txt --resolver=backtracking pccommon/setup.py pcstac/setup.py
+#    pip-compile --extra=server --output-file=pcstac/requirements.txt pccommon/setup.py pcstac/setup.py
 #
 anyio==3.6.2
     # via
@@ -177,7 +177,7 @@ pypgstac[psycopg]==0.7.3
     # via
     #   pcstac (pcstac/setup.py)
     #   stac-fastapi-pgstac
-pystac==1.7.1
+pystac==1.9.0
     # via
     #   pcstac (pcstac/setup.py)
     #   stac-fastapi-types
diff --git a/pcstac/setup.py b/pcstac/setup.py
index 2b1496b3..ab3b7fc9 100644
--- a/pcstac/setup.py
+++ b/pcstac/setup.py
@@ -10,7 +10,7 @@
     "stac-fastapi.types==2.4.5",
     # Required due to some imports related to pypgstac CLI usage in startup script
     "pypgstac[psycopg]~=0.7",
-    "pystac==1.*",
+    "pystac>=1.8,<2.0",
 ]
 
 extra_reqs = {