diff --git a/Gemfile.lock b/Gemfile.lock
index 8f6726b..f087f40 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -7,23 +7,23 @@ GEM
     ci_reporter_test_unit (1.0.1)
       ci_reporter (~> 2.0)
       test-unit (>= 2.5.5, < 4.0)
-    mustermann (1.1.1)
+    mustermann (3.0.0)
       ruby2_keywords (~> 0.0.1)
     power_assert (1.2.0)
-    rack (2.2.3)
-    rack-protection (2.2.0)
+    rack (2.2.4)
+    rack-protection (3.0.4)
       rack
     rack-test (1.1.0)
       rack (>= 1.0, < 3)
     ruby2_keywords (0.0.5)
-    sinatra (2.2.0)
-      mustermann (~> 1.0)
-      rack (~> 2.2)
-      rack-protection (= 2.2.0)
+    sinatra (3.0.4)
+      mustermann (~> 3.0)
+      rack (~> 2.2, >= 2.2.4)
+      rack-protection (= 3.0.4)
       tilt (~> 2.0)
     test-unit (3.3.7)
       power_assert
-    tilt (2.0.10)
+    tilt (2.0.11)
 
 PLATFORMS
   ruby