diff --git a/Gemfile.lock b/Gemfile.lock
index e8c1d24..2644290 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -4,14 +4,18 @@ GEM
     haml (5.1.2)
       temple (>= 0.8.0)
       tilt
-    rack (1.6.13)
-    rack-protection (1.5.5)
+    mustermann (1.1.1)
+      ruby2_keywords (~> 0.0.1)
+    rack (2.2.3)
+    rack-protection (2.2.0)
       rack
+    ruby2_keywords (0.0.5)
     sequel (4.39.0)
-    sinatra (1.4.7)
-      rack (~> 1.5)
-      rack-protection (~> 1.4)
-      tilt (>= 1.3, < 3)
+    sinatra (2.2.0)
+      mustermann (~> 1.0)
+      rack (~> 2.2)
+      rack-protection (= 2.2.0)
+      tilt (~> 2.0)
     sqlite3 (1.3.12)
     temple (0.8.2)
     tilt (2.0.10)