diff --git a/Gemfile.lock b/Gemfile.lock
index ec7b64463..90383eff3 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -100,7 +100,7 @@ GEM
       msgpack (~> 1)
     msgpack (1.5.4)
     multipart-post (2.2.3)
-    mustermann (2.0.2)
+    mustermann (3.0.0)
       ruby2_keywords (~> 0.0.1)
     naught (1.1.0)
     net-protocol (0.1.3)
@@ -133,7 +133,7 @@ GEM
       rqrcode_core (~> 0.1)
     racc (1.6.0)
     rack (2.2.4)
-    rack-protection (2.2.2)
+    rack-protection (3.0.2)
       rack
     rack-test (2.0.2)
       rack (>= 1.3)
@@ -189,10 +189,10 @@ GEM
       rubyzip (>= 1.2.2, < 3.0)
       websocket (~> 1.0)
     simple_oauth (0.3.1)
-    sinatra (2.2.2)
-      mustermann (~> 2.0)
-      rack (~> 2.2)
-      rack-protection (= 2.2.2)
+    sinatra (3.0.2)
+      mustermann (~> 3.0)
+      rack (~> 2.2, >= 2.2.4)
+      rack-protection (= 3.0.2)
       tilt (~> 2.0)
     slack-notifier (2.4.0)
     sqlite3 (1.5.2-x86_64-linux)