diff --git a/pyproject.toml b/pyproject.toml
index 071679d24..f4b9fd628 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -17,7 +17,8 @@ dependencies = [
     "asdf-astropy >=0.5.0",
     "astropy >=5.3.0",
     "crds >=11.16.16",
-    "gwcs >=0.21.0",
+    # "gwcs >=0.21.0",
+    "gwcs @ git+https://github.com/WilliamJamieson/gwcs.git@test_visp_wcs",
     "jsonschema >=4.8",
     "numpy >=1.24",
     "photutils >=1.13.0",