diff --git a/app b/app
index 3f3857952..d5408d1f0 160000
--- a/app
+++ b/app
@@ -1 +1 @@
-Subproject commit 3f38579529014c4801c157c0d78d0260d5c61b42
+Subproject commit d5408d1f09f886e3bb492d96e25f0c9f48781c4a
diff --git a/utils/src/main/java/com/topjohnwu/utils/SignAPK.java b/utils/src/main/java/com/topjohnwu/utils/SignAPK.java
index 246b53731..084421bb2 100644
--- a/utils/src/main/java/com/topjohnwu/utils/SignAPK.java
+++ b/utils/src/main/java/com/topjohnwu/utils/SignAPK.java
@@ -494,6 +494,7 @@ public class SignAPK {
         outputStream.write(total_size & 0xff);
         outputStream.write((total_size >> 8) & 0xff);
         temp.writeTo(outputStream);
+        outputStream.close();
     }
     private static void signFile(Manifest manifest, JarMap inputJar,
                                  X509Certificate publicKey, PrivateKey privateKey,