diff --git a/src/main/java/cn/heavenlybook/Main.java b/src/main/java/cn/heavenlybook/Main.java
index c658c43..48caeec 100644
--- a/src/main/java/cn/heavenlybook/Main.java
+++ b/src/main/java/cn/heavenlybook/Main.java
@@ -67,6 +67,7 @@ public class Main {
       }
     }
     canvas.dispose();
+    converter.close();
     grabber.close();
   }
 }