diff --git a/mica-captcha/src/main/java/net/dreamlu/mica/captcha/core/Captcha.java b/mica-captcha/src/main/java/net/dreamlu/mica/captcha/core/Captcha.java
index 57c5adb9d6ad134b63b06569f2cba8a321a6842b..04f681c28f706b6a62ccb5a5fd35054799d979b2 100644
--- a/mica-captcha/src/main/java/net/dreamlu/mica/captcha/core/Captcha.java
+++ b/mica-captcha/src/main/java/net/dreamlu/mica/captcha/core/Captcha.java
@@ -106,6 +106,8 @@ public class Captcha implements ICaptcha {
 			return captcha;
 		} catch (IOException e) {
 			throw Exceptions.unchecked(e);
+		} finally {
+			graphics.dispose();
 		}
 	}