diff --git a/Gemfile.lock b/Gemfile.lock
index 3d7efa4..94822d4 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -7,17 +7,21 @@ GEM
       fssm (>= 0.2.7)
       sass (~> 3.2.19)
     fssm (0.2.10)
-    rack (1.5.2)
-    rack-protection (1.5.3)
+    mustermann (2.0.2)
+      ruby2_keywords (~> 0.0.1)
+    rack (2.2.4)
+    rack-protection (2.2.3)
       rack
+    ruby2_keywords (0.0.5)
     sass (3.2.19)
-    sinatra (1.4.5)
-      rack (~> 1.4)
-      rack-protection (~> 1.4)
-      tilt (~> 1.3, >= 1.3.4)
+    sinatra (2.2.3)
+      mustermann (~> 2.0)
+      rack (~> 2.2)
+      rack-protection (= 2.2.3)
+      tilt (~> 2.0)
     sinatra-flash (0.3.0)
       sinatra (>= 1.0.0)
-    tilt (1.4.1)
+    tilt (2.0.11)
 
 PLATFORMS
   ruby