diff --git a/environment.yml b/environment.yml
index 46669019..3bb64c09 100644
--- a/environment.yml
+++ b/environment.yml
@@ -6,8 +6,8 @@ channels:
 dependencies:
   - python=3.10
   - mantid>6.9.20240318
-  - qt>=5.12.9,<6
-  - pyqt>=5.12.3
+  - qt==5.15.8
+  - pyqt>=5.15,<6
   - qtpy>=1.9.0
   - configobj
   - matplotlib