diff --git a/Gemfile.lock b/Gemfile.lock
index 4f45ae8..7190872 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -190,7 +190,9 @@ GEM
     mime-types (3.2.2)
       mime-types-data (~> 3.2015)
     mime-types-data (3.2018.0812)
-    mimemagic (0.3.2)
+    mimemagic (0.3.10)
+      nokogiri (~> 1)
+      rake
     mini_magick (4.7.0)
     mini_mime (1.0.1)
     mini_portile2 (2.3.0)
@@ -201,7 +203,8 @@ GEM
     multi_test (0.1.2)
     multi_xml (0.6.0)
     multipart-post (2.0.0)
-    mustermann (1.0.3)
+    mustermann (2.0.2)
+      ruby2_keywords (~> 0.0.1)
     nio4r (2.3.1)
     nokogiri (1.8.5)
       mini_portile2 (~> 2.3.0)
@@ -229,8 +232,8 @@ GEM
     pg (1.1.3-x64-mingw32)
     public_suffix (3.0.3)
     puma (3.12.0)
-    rack (2.0.6)
-    rack-protection (2.0.4)
+    rack (2.2.4)
+    rack-protection (2.2.3)
       rack
     rack-test (1.1.0)
       rack (>= 1.0, < 3)
@@ -293,6 +296,7 @@ GEM
       rspec-mocks (~> 3.8.0)
       rspec-support (~> 3.8.0)
     rspec-support (3.8.0)
+    ruby2_keywords (0.0.5)
     ruby_dep (1.5.0)
     rubyzip (1.2.2)
     sass (3.7.2)
@@ -311,10 +315,10 @@ GEM
       rubyzip (~> 1.2, >= 1.2.2)
     simple_calendar (2.3.0)
       rails (>= 3.0)
-    sinatra (2.0.4)
-      mustermann (~> 1.0)
-      rack (~> 2.0)
-      rack-protection (= 2.0.4)
+    sinatra (2.2.3)
+      mustermann (~> 2.0)
+      rack (~> 2.2)
+      rack-protection (= 2.2.3)
       tilt (~> 2.0)
     spring (2.0.2)
       activesupport (>= 4.2)
@@ -333,7 +337,7 @@ GEM
     temple (0.8.0)
     thor (0.20.3)
     thread_safe (0.3.6)
-    tilt (2.0.8)
+    tilt (2.0.11)
     turbolinks (5.2.0)
       turbolinks-source (~> 5.2)
     turbolinks-source (5.2.0)