diff --git a/Gemfile.lock b/Gemfile.lock
index 5f0f96a..ec2e0c6 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -9,17 +9,21 @@ GEM
       basiccache (~> 1.0.0)
       nokogiri (~> 1.10.8)
     mini_portile2 (2.4.0)
+    mustermann (1.1.1)
+      ruby2_keywords (~> 0.0.1)
     nokogiri (1.10.10)
       mini_portile2 (~> 2.4.0)
-    rack (1.6.4)
-    rack-protection (1.5.3)
+    rack (2.2.3)
+    rack-protection (2.2.0)
       rack
-    sinatra (1.4.6)
-      rack (~> 1.4)
-      rack-protection (~> 1.4)
-      tilt (>= 1.3, < 3)
+    ruby2_keywords (0.0.5)
+    sinatra (2.2.0)
+      mustermann (~> 1.0)
+      rack (~> 2.2)
+      rack-protection (= 2.2.0)
+      tilt (~> 2.0)
     svgplot (1.0.0)
-    tilt (2.0.1)
+    tilt (2.0.10)
 
 PLATFORMS
   ruby