diff --git a/Gemfile.lock b/Gemfile.lock
index 7f90e37..c6af7b1 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -11,19 +11,23 @@ GEM
       nokogiri (~> 1.13.10)
     matrix (0.4.2)
     mini_portile2 (2.8.1)
+    mustermann (2.0.2)
+      ruby2_keywords (~> 0.0.1)
     nokogiri (1.13.10)
       mini_portile2 (~> 2.8.0)
       racc (~> 1.4)
     racc (1.6.2)
-    rack (1.6.4)
-    rack-protection (1.5.3)
+    rack (2.2.5)
+    rack-protection (2.2.3)
       rack
-    sinatra (1.4.6)
-      rack (~> 1.4)
-      rack-protection (~> 1.4)
-      tilt (>= 1.3, < 3)
+    ruby2_keywords (0.0.5)
+    sinatra (2.2.3)
+      mustermann (~> 2.0)
+      rack (~> 2.2)
+      rack-protection (= 2.2.3)
+      tilt (~> 2.0)
     svgplot (1.0.0)
-    tilt (2.0.1)
+    tilt (2.0.11)
 
 PLATFORMS
   ruby