diff --git a/app.yaml b/app.yaml
index 00f0a74..3910ced 100644
--- a/app.yaml
+++ b/app.yaml
@@ -44,7 +44,7 @@ handlers:
 - url: /images
   static_dir: images
   secure: always
-  expiration: 1w
+  expiration: 7d
   http_headers:
     X-Frame-Options: DENY
     X-Content-Type-Options: nosniff
@@ -53,7 +53,7 @@ handlers:
 - url: /stylesheets
   static_dir: stylesheets
   secure: always
-  expiration: 1w
+  expiration: 7d
   http_headers:
     X-Frame-Options: DENY
     X-Content-Type-Options: nosniff