diff --git a/.gitignore b/.gitignore
index bb942e86..29644655 100644
--- a/.gitignore
+++ b/.gitignore
@@ -44,6 +44,7 @@ game/cache/
 project.json
 android.json
 *.keystore
+*.pem
 
 # Ren'py logs
 traceback.txt
diff --git a/game/scripts/options.rpy b/game/scripts/options.rpy
index 51f68e95..28d4e35b 100644
--- a/game/scripts/options.rpy
+++ b/game/scripts/options.rpy
@@ -154,6 +154,7 @@ init python:
     build.include_update = True
     build.include_old_themes = False
     build.exclude_empty_directories = True
+    build.update_formats += ['zsync']
 
     build.classify("**.rpy", "renpy")
     build.classify("**.rpyc", "all")
@@ -185,6 +186,9 @@ init python:
     build.classify("**~", None)
     build.classify("**.db", None)
     build.classify("**.zip", None)
+    build.classify("android.keystore", None)
+    build.classify("bundle.keystore", None)
+    build.classify("update.pem", None)
 
     build.classify("cache/**", "android")
     build.classify("game/saves/**", None)