diff --git a/data/params.db b/data/params.db
index d946738..58a552e 100644
Binary files a/data/params.db and b/data/params.db differ
diff --git a/lib/RLTrader.py b/lib/RLTrader.py
index 4c6617d..c223c8a 100644
--- a/lib/RLTrader.py
+++ b/lib/RLTrader.py
@@ -134,8 +134,8 @@ def optimize_params(self, trial, n_prune_evals_per_trial: int = 2, n_tests_per_e
 
         del test_provider
 
-        train_env = SubprocVecEnv([make_env(train_provider, i) for i in range(1)])
-        validation_env = SubprocVecEnv([make_env(validation_provider, i) for i in range(1)])
+        train_env = DummyVecEnv([lambda: TradingEnv(train_provider)])
+        validation_env = DummyVecEnv([lambda: TradingEnv(validation_provider)])
 
         model_params = self.optimize_agent_params(trial)
         model = self.Model(self.Policy,