diff --git a/pyproject.toml b/pyproject.toml
index 142a0ebd64..7d500ba6d8 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -36,7 +36,7 @@ dependencies = [
     "scikit-image>=0.19",
     "scipy>=1.6.0",
     "spherical-geometry>=1.2.22",
-    "stcal>=1.5.0,<1.6.0",
+    "stcal>=1.6.0,<1.7.0",
     "stdatamodels>=1.9.0,<1.10.0",
     "stpipe>=0.5.0,<0.6.0",
     "stsci.image>=2.3.5",