diff --git a/implementations/ruby/Gemfile.lock b/implementations/ruby/Gemfile.lock
index 21c0164..9c2df7a 100644
--- a/implementations/ruby/Gemfile.lock
+++ b/implementations/ruby/Gemfile.lock
@@ -7,20 +7,22 @@ GEM
       multipart-post (>= 1.2, < 3)
     method_source (0.9.0)
     multipart-post (2.0.0)
-    mustermann (1.0.3)
+    mustermann (2.0.2)
+      ruby2_keywords (~> 0.0.1)
     pry (0.11.3)
       coderay (~> 1.1.0)
       method_source (~> 0.9.0)
     puma (3.11.2)
-    rack (2.0.5)
-    rack-protection (2.0.4)
+    rack (2.2.4)
+    rack-protection (2.2.3)
       rack
-    sinatra (2.0.4)
-      mustermann (~> 1.0)
-      rack (~> 2.0)
-      rack-protection (= 2.0.4)
+    ruby2_keywords (0.0.5)
+    sinatra (2.2.3)
+      mustermann (~> 2.0)
+      rack (~> 2.2)
+      rack-protection (= 2.2.3)
       tilt (~> 2.0)
-    tilt (2.0.8)
+    tilt (2.0.11)
 
 PLATFORMS
   ruby