diff --git a/examples/api/Gemfile.lock b/examples/api/Gemfile.lock
index 470cdfa..ab816c2 100644
--- a/examples/api/Gemfile.lock
+++ b/examples/api/Gemfile.lock
@@ -7,7 +7,6 @@ GEM
       faraday (~> 1.0.1)
       highline (~> 2.0.3)
       typhoeus (~> 1.4.0)
-    backports (3.18.1)
     daemons (1.3.1)
     ethon (0.12.0)
       ffi (>= 1.3.0)
@@ -16,25 +15,24 @@ GEM
       multipart-post (>= 1.2, < 3)
     ffi (1.13.1)
     highline (2.0.3)
-    multi_json (1.14.1)
+    multi_json (1.15.0)
     multipart-post (2.1.1)
     mustermann (1.1.1)
       ruby2_keywords (~> 0.0.1)
     rack (2.2.3)
-    rack-protection (2.0.8.1)
+    rack-protection (2.2.0)
       rack
-    ruby2_keywords (0.0.2)
-    sinatra (2.0.8.1)
+    ruby2_keywords (0.0.5)
+    sinatra (2.2.0)
       mustermann (~> 1.0)
-      rack (~> 2.0)
-      rack-protection (= 2.0.8.1)
+      rack (~> 2.2)
+      rack-protection (= 2.2.0)
       tilt (~> 2.0)
-    sinatra-contrib (2.0.8.1)
-      backports (>= 2.8.2)
+    sinatra-contrib (2.2.0)
       multi_json
       mustermann (~> 1.0)
-      rack-protection (= 2.0.8.1)
-      sinatra (= 2.0.8.1)
+      rack-protection (= 2.2.0)
+      sinatra (= 2.2.0)
       tilt (~> 2.0)
     thin (1.7.2)
       daemons (~> 1.0, >= 1.0.9)