diff --git a/pyproject.toml b/pyproject.toml
index 07c6546..ee1bf25 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -55,6 +55,7 @@ dev = [
   "setuptools_scm",
   "pytest-qt",
   "qtpy",
+  "PyQt5",
 ]
 
 slumrmio = [