diff --git a/pyproject.toml b/pyproject.toml
index 2dd800f..ddcaa08 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -40,6 +40,7 @@ ci = [
 ]
 test = [
   'pytest>=5.2',
+  'pytest-image-diff',
   'pytest-benchmark'
 ]