diff --git a/server/Gemfile.lock b/server/Gemfile.lock
index b16a5db..bef52cf 100644
--- a/server/Gemfile.lock
+++ b/server/Gemfile.lock
@@ -14,7 +14,7 @@ GEM
     mustermann (1.1.1)
       ruby2_keywords (~> 0.0.1)
     netrc (0.11.0)
-    rack (2.2.2)
+    rack (2.2.6.3)
     rack-protection (2.0.8.1)
       rack
     rest-client (2.1.0)