diff --git a/Gemfile.lock b/Gemfile.lock
index b91fa01..6208451 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -212,7 +212,8 @@ GEM
       rspec-expectations (~> 3.3)
       rspec-mocks (~> 3.3)
     multi_json (1.13.1)
-    mustermann (1.0.2)
+    mustermann (2.0.2)
+      ruby2_keywords (~> 0.0.1)
     net-imap (0.3.4)
       date
       net-protocol
@@ -236,7 +237,7 @@ GEM
       nio4r (~> 2.0)
     racc (1.6.2)
     rack (2.2.6.3)
-    rack-protection (2.0.3)
+    rack-protection (2.2.4)
       rack
     rack-test (2.0.2)
       rack (>= 1.3)
@@ -342,10 +343,10 @@ GEM
       json (>= 1.8, < 3)
       simplecov-html (~> 0.10.0)
     simplecov-html (0.10.2)
-    sinatra (2.0.3)
-      mustermann (~> 1.0)
-      rack (~> 2.0)
-      rack-protection (= 2.0.3)
+    sinatra (2.2.4)
+      mustermann (~> 2.0)
+      rack (~> 2.2)
+      rack-protection (= 2.2.4)
       tilt (~> 2.0)
     sprockets (4.0.2)
       concurrent-ruby (~> 1.0)
@@ -397,6 +398,7 @@ DEPENDENCIES
   bootstrap-sass (>= 3.4.1)
   bootstrap-tagsinput-rails
   bson_ext
+  bundler (~> 1.15)
   byebug
   capybara (= 3.18.0)
   climate_control