diff --git a/pyproject.toml b/pyproject.toml
index e496bad..a04a882 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -34,7 +34,7 @@ dependencies = [
     "astroquery == 0.4.11",
     "cmocean == 4.0.3",
     "crds == 13.1.7",
-    "gwcs == 0.26.0",
+    "gwcs == 1.0.3",
     "image-registration == 0.2.9",
     "jwst == 1.20.2",
     "lmfit == 1.3.4",