diff --git a/Gemfile.lock b/Gemfile.lock
index 8b0298b..2da6b47 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -26,6 +26,8 @@ GEM
       msgpack
     method_source (0.8.2)
     msgpack (1.1.0)
+    mustermann (2.0.2)
+      ruby2_keywords (~> 0.0.1)
     net-scp (1.2.1)
       net-ssh (>= 2.6.5)
     net-ssh (3.2.0)
@@ -33,16 +35,18 @@ GEM
       coderay (~> 1.1.0)
       method_source (~> 0.8.1)
       slop (~> 3.4)
-    rack (1.6.12)
-    rack-protection (1.5.5)
+    rack (2.2.4)
+    rack-protection (2.2.3)
       rack
     raindrops (0.19.1)
     rake (13.0.1)
+    ruby2_keywords (0.0.5)
     sass (3.4.22)
-    sinatra (1.4.7)
-      rack (~> 1.5)
-      rack-protection (~> 1.4)
-      tilt (>= 1.3, < 3)
+    sinatra (2.2.3)
+      mustermann (~> 2.0)
+      rack (~> 2.2)
+      rack-protection (= 2.2.3)
+      tilt (~> 2.0)
     slop (3.6.0)
     sprockets (3.7.2)
       concurrent-ruby (~> 1.0)
@@ -50,7 +54,7 @@ GEM
     sshkit (1.11.3)
       net-scp (>= 1.1.2)
       net-ssh (>= 2.8.0)
-    tilt (2.0.5)
+    tilt (2.0.11)
     unicorn (5.5.4)
       kgio (~> 2.6)
       raindrops (~> 0.7)