diff --git a/pyproject.toml b/pyproject.toml
index 9afc0b5a..2d76b705 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -52,7 +52,7 @@ export = [
 ]
 qgym_mapper = [
     "qgym==0.3.1",
-    "stable-baselines3==2.8.0",
+    "stable-baselines3==2.9.0",
     "sb3-contrib==2.8.0",
 ]
 docs = [