diff --git a/notebooks/JWST/NIRCam/PSF_phot_01/GriddedPSFModel_simulation_and_photometry.ipynb b/notebooks/JWST/NIRCam/PSF_phot_01/GriddedPSFModel_simulation_and_photometry.ipynb
index ddd6799f..26ab37ec 100644
--- a/notebooks/JWST/NIRCam/PSF_phot_01/GriddedPSFModel_simulation_and_photometry.ipynb
+++ b/notebooks/JWST/NIRCam/PSF_phot_01/GriddedPSFModel_simulation_and_photometry.ipynb
@@ -147,7 +147,7 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "psfmodel = to_griddedpsfmodel(hdu, ext=0)"
+    "psfmodel = to_griddedpsfmodel(hdu, ext_header=0, ext_data=0)"
    ]
   },
   {
@@ -542,7 +542,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.7.1"
+   "version": "3.7.4"
   }
  },
  "nbformat": 4,
diff --git a/notebooks/JWST/NIRCam/PSF_phot_01/requirements.txt b/notebooks/JWST/NIRCam/PSF_phot_01/requirements.txt
index fab3d570..fac06efb 100644
--- a/notebooks/JWST/NIRCam/PSF_phot_01/requirements.txt
+++ b/notebooks/JWST/NIRCam/PSF_phot_01/requirements.txt
@@ -2,5 +2,5 @@ numpy>=1.15
 matplotlib>=2.2
 astropy>=3.1.2
 photutils>=0.6
-webbpsf>=0.8
+webbpsf>=0.9
 scikit-learn>=0.20