diff --git a/environment_gpu.yaml b/environment_gpu.yaml
index 6aa92e60..90445731 100644
--- a/environment_gpu.yaml
+++ b/environment_gpu.yaml
@@ -5,9 +5,9 @@ channels:
     - conda-forge
 dependencies:
     - imagecodecs
-    - nifty=1.2.1=*_4
+    - nifty =1.2.1=*_4
     - magicgui
-    - napari
+    - napari <0.5
     - pip
     - pooch
     - pyqt