diff --git a/Gemfile.lock b/Gemfile.lock
index 486da97..a6aee00 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -2,7 +2,6 @@ GEM
   remote: https://rubygems.org/
   specs:
     ast (2.4.1)
-    backports (3.18.1)
     daemons (1.3.1)
     eventmachine (1.2.7)
     ffi (1.13.1)
@@ -17,7 +16,7 @@ GEM
       ast (~> 2.4.1)
     pdfkit (0.8.4.3.1)
     rack (2.2.3)
-    rack-protection (2.0.8.1)
+    rack-protection (2.2.0)
       rack
     rack-test (1.1.0)
       rack (>= 1.0, < 3)
@@ -39,23 +38,22 @@ GEM
     rubocop-ast (0.2.0)
       parser (>= 2.7.0.1)
     ruby-progressbar (1.10.1)
-    ruby2_keywords (0.0.2)
+    ruby2_keywords (0.0.5)
     sass (3.7.4)
       sass-listen (~> 4.0.0)
     sass-listen (4.0.0)
       rb-fsevent (~> 0.9, >= 0.9.4)
       rb-inotify (~> 0.9, >= 0.9.7)
-    sinatra (2.0.8.1)
+    sinatra (2.2.0)
       mustermann (~> 1.0)
-      rack (~> 2.0)
-      rack-protection (= 2.0.8.1)
+      rack (~> 2.2)
+      rack-protection (= 2.2.0)
       tilt (~> 2.0)
-    sinatra-contrib (2.0.8.1)
-      backports (>= 2.8.2)
+    sinatra-contrib (2.2.0)
       multi_json
       mustermann (~> 1.0)
-      rack-protection (= 2.0.8.1)
-      sinatra (= 2.0.8.1)
+      rack-protection (= 2.2.0)
+      sinatra (= 2.2.0)
       tilt (~> 2.0)
     temple (0.8.2)
     thin (1.7.2)