diff --git a/composer.json b/composer.json
index 251c96c..e027c48 100644
--- a/composer.json
+++ b/composer.json
@@ -40,7 +40,7 @@
         "predis/predis": "^2.2 || ^3.0",
         "rasuvaeff/property-testing-testo": "^1.0",
         "rasuvaeff/rector-named-literals": "^1.0",
-        "rasuvaeff/understudy-testo": "^0.3",
+        "rasuvaeff/understudy-testo": "^1.0",
         "rector/rector": "^2.4",
         "roave/backward-compatibility-check": "^8.0",
         "testo/bridge-infection": "^0.1.6",