diff --git a/with-sinatra/Gemfile.lock b/with-sinatra/Gemfile.lock
index f879e0d0..5fc39971 100644
--- a/with-sinatra/Gemfile.lock
+++ b/with-sinatra/Gemfile.lock
@@ -18,8 +18,8 @@ GEM
       rack (>= 3.0.0, < 4)
     rack-session (2.0.0)
       rack (>= 3.0.0)
-    resend (0.10.0)
-      httparty (>= 0.19.1)
+    resend (0.11.0)
+      httparty (>= 0.21.0)
     ruby2_keywords (0.0.5)
     sinatra (4.0.0)
       mustermann (~> 3.0)