diff --git a/pyproject.toml b/pyproject.toml
index 35ab53499..6357b5ccd 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -65,7 +65,7 @@ dependencies = [
     "wheel",
     "geopandas",
     "rasterio==1.3.4",
-    "pystac==0.5.6",
+    "pystac==1.9.0",
     "PyJWT",
     "werkzeug==2.3.6",
     "pandas",
diff --git a/requirements.txt b/requirements.txt
index ce19b8f8e..a9955e539 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -29,7 +29,7 @@ uWSGI>=2.0.17
 wheel
 geopandas
 rasterio==1.3.4
-pystac==0.5.6
+pystac==1.9.0
 PyJWT
 werkzeug==2.3.6
 # required for running i.sentinel.download from GCS: