diff --git a/pyproject.toml b/pyproject.toml
index 155e2ea531..cdb53db6ac 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -23,7 +23,8 @@ dependencies = [
     "BayesicFitting>=3.0.1",
     "crds>=12.0.3",
     "drizzle>=2.0.0",
-    "gwcs>=0.21.0,<0.23.0",
+    # "gwcs>=0.21.0,<0.23.0",
+    "gwcs @ git+https://github.com/WilliamJamieson/gwcs.git@test_visp_wcs",
     "numpy>=1.22,<2.0",
     "opencv-python-headless>=4.6.0.66",
     "photutils>=1.5.0",