diff --git a/Gemfile.lock b/Gemfile.lock
index ec76dbc..49766a7 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -24,7 +24,7 @@ GEM
       coderay (~> 1.1.0)
       method_source (~> 0.8.1)
       slop (~> 3.4)
-    puma (3.9.1)
+    puma (3.12.2)
     rack (2.0.3)
     rack-protection (2.0.0)
       rack
@@ -37,6 +37,11 @@ GEM
       httparty (~> 0.12.0)
       rdf (~> 1.1.0)
     redis (3.3.3)
+    redis-rack (2.0.6)
+      rack (>= 1.5, < 3)
+      redis-store (>= 1.2, < 2)
+    redis-store (1.6.0)
+      redis (>= 2.2, < 5)
     sinatra (2.0.0)
       mustermann (~> 1.0)
       rack (~> 2.0)
@@ -66,6 +71,8 @@ DEPENDENCIES
   rdf
   rdf-virtuoso
   redis
+  redis-rack
+  redis-store
   sinatra
   sinatra-reloader