diff --git a/pyproject.toml b/pyproject.toml
index 32c2b05a60..fe46d35f36 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -23,7 +23,7 @@ dependencies = [
     "BayesicFitting>=3.0.1",
     "crds>=11.17.14",
     "drizzle>=1.15.0",
-    "gwcs>=0.21.0,<0.22.0",
+    "gwcs @ git+https://github.com/nden/gwcs.git@ff195fb,
     "numpy>=1.22",
     "opencv-python-headless>=4.6.0.66",
     "photutils>=1.5.0",