diff --git a/1-grid-world/4-q-learning/agent.py b/1-grid-world/4-q-learning/agent.py
index 811b00b..df9f927 100644
--- a/1-grid-world/4-q-learning/agent.py
+++ b/1-grid-world/4-q-learning/agent.py
@@ -9,7 +9,7 @@ def __init__(self, actions):
         self.actions = actions
         self.step_size = 0.01
         self.discount_factor = 0.9
-        self.epsilon = 0.9
+        self.epsilon = 0.1
         self.q_table = defaultdict(lambda: [0.0, 0.0, 0.0, 0.0])
 
     # <s, a, r, s'> 샘플로부터 큐함수 업데이트