diff --git a/Gemfile.lock b/Gemfile.lock
index 0f4c00f..0eeb3a2 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -61,15 +61,19 @@ GEM
     json (1.6.1)
     json_pure (1.6.1)
     multi_json (1.0.3)
-    rack (1.3.5)
-    rack-protection (1.1.4)
+    mustermann (2.0.2)
+      ruby2_keywords (~> 0.0.1)
+    rack (2.2.4)
+    rack-protection (2.2.3)
       rack
-    sinatra (1.3.1)
-      rack (~> 1.3, >= 1.3.4)
-      rack-protection (~> 1.1, >= 1.1.2)
-      tilt (~> 1.3, >= 1.3.3)
+    ruby2_keywords (0.0.5)
+    sinatra (2.2.3)
+      mustermann (~> 2.0)
+      rack (~> 2.2)
+      rack-protection (= 2.2.3)
+      tilt (~> 2.0)
     stringex (1.3.0)
-    tilt (1.3.3)
+    tilt (2.0.11)
     uuidtools (2.1.2)
 
 PLATFORMS