diff --git a/src/poli_baselines/solvers/simple/random_mutation.py b/src/poli_baselines/solvers/simple/random_mutation.py
index 7196e9e..9031406 100644
--- a/src/poli_baselines/solvers/simple/random_mutation.py
+++ b/src/poli_baselines/solvers/simple/random_mutation.py
@@ -9,6 +9,8 @@
 a new value for that position.
 """
 
+from __future__ import annotations
+
 import random
 import warnings
 from typing import Callable
diff --git a/tox.ini b/tox.ini
index fafb51f..1f1a44f 100644
--- a/tox.ini
+++ b/tox.ini
@@ -7,6 +7,7 @@ env_list =
     poli-alebo-base-py310
     poli-pr-base-py39
     poli-bounce-base-py310
+    poli-lambo2-base-py310
 minversion = 4.10.0
 
 [testenv]