diff --git a/Gemfile.lock b/Gemfile.lock
index f4fabba..013c382 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,13 +1,17 @@
 GEM
   remote: https://rubygems.org/
   specs:
+    base64 (0.2.0)
     mono_logger (1.1.0)
     multi_json (1.15.0)
     mustermann (3.0.0)
       ruby2_keywords (~> 0.0.1)
-    rack (2.2.6.4)
-    rack-protection (3.0.6)
-      rack
+    rack (3.0.9.1)
+    rack-protection (4.0.0)
+      base64 (>= 0.1.0)
+      rack (>= 3.0.0, < 4)
+    rack-session (2.0.0)
+      rack (>= 3.0.0)
     redis (3.3.5)
     redis-namespace (1.7.0)
       redis (>= 3.0.4)
@@ -18,13 +22,14 @@ GEM
       sinatra (>= 0.9.2)
       vegas (~> 0.1.2)
     ruby2_keywords (0.0.5)
-    sinatra (3.0.6)
+    sinatra (4.0.0)
       mustermann (~> 3.0)
-      rack (~> 2.2, >= 2.2.4)
-      rack-protection (= 3.0.6)
+      rack (>= 3.0.0, < 4)
+      rack-protection (= 4.0.0)
+      rack-session (>= 2.0.0, < 3)
       tilt (~> 2.0)
     statsd-ruby (1.4.0)
-    tilt (2.1.0)
+    tilt (2.3.0)
     vegas (0.1.11)
       rack (>= 1.0.0)