diff --git a/Gemfile.lock b/Gemfile.lock
index 57d4c2c..fddb1ba 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -8,17 +8,16 @@ GEM
       tzinfo (~> 1.1)
     addressable (2.5.2)
       public_suffix (>= 2.0.2, < 4.0)
-    backports (3.15.0)
     bcp47 (0.3.3)
       i18n
     builder (3.2.3)
-    capybara (2.15.4)
+    capybara (2.18.0)
       addressable
       mini_mime (>= 0.1.3)
       nokogiri (>= 1.3.3)
       rack (>= 1.0.0)
       rack-test (>= 0.5.4)
-      xpath (~> 2.0)
+      xpath (>= 2.0, < 4.0)
     capybara_minitest_spec (1.0.6)
       capybara (>= 2)
       minitest (>= 4)
@@ -87,7 +86,8 @@ GEM
     mini_portile2 (2.4.0)
     minitest (5.10.3)
     multi_json (1.13.1)
-    mustermann (1.0.3)
+    mustermann (2.0.2)
+      ruby2_keywords (~> 0.0.1)
     net-http-persistent (3.0.0)
       connection_pool (~> 2.2)
     nokogiri (1.10.4)
@@ -99,16 +99,16 @@ GEM
       websocket-driver (>= 0.2.0)
     public_suffix (3.0.0)
     puma (3.10.0)
-    rack (2.0.7)
-    rack-cache (1.7.1)
+    rack (2.2.4)
+    rack-cache (1.13.0)
       rack (>= 0.4)
-    rack-contrib (1.2.0)
-      rack (>= 0.9.1)
+    rack-contrib (2.3.0)
+      rack (~> 2.0)
     rack-cors (1.0.2)
-    rack-protection (2.0.5)
+    rack-protection (2.2.3)
       rack
-    rack-test (0.7.0)
-      rack (>= 1.0, < 3)
+    rack-test (2.0.2)
+      rack (>= 1.3)
     rake (12.2.1)
     rdf (3.0.1)
       hamster (~> 3.0)
@@ -163,6 +163,7 @@ GEM
       rdf (~> 3.0)
     rdf-xsd (3.0.0)
       rdf (~> 3.0)
+    ruby2_keywords (0.0.5)
     shex (0.5.2)
       ebnf (~> 1.1)
       json-ld (>= 2.2, < 4.0)
@@ -171,18 +172,17 @@ GEM
       rdf-xsd (>= 2.2, < 4.0)
       sparql (>= 2.2, < 4.0)
       sxp (~> 1.0)
-    sinatra (2.0.5)
-      mustermann (~> 1.0)
-      rack (~> 2.0)
-      rack-protection (= 2.0.5)
+    sinatra (2.2.3)
+      mustermann (~> 2.0)
+      rack (~> 2.2)
+      rack-protection (= 2.2.3)
       tilt (~> 2.0)
-    sinatra-contrib (2.0.5)
-      backports (>= 2.8.2)
+    sinatra-contrib (2.2.3)
       multi_json
-      mustermann (~> 1.0)
-      rack-protection (= 2.0.5)
-      sinatra (= 2.0.5)
-      tilt (>= 1.3, < 3)
+      mustermann (~> 2.0)
+      rack-protection (= 2.2.3)
+      sinatra (= 2.2.3)
+      tilt (~> 2.0)
     sparql (3.0.0)
       builder (~> 3.2)
       ebnf (~> 1.1)
@@ -198,7 +198,7 @@ GEM
       rdf (>= 2.2, < 4.0)
     temple (0.8.0)
     thread_safe (0.3.6)
-    tilt (2.0.9)
+    tilt (2.0.11)
     tzinfo (1.2.4)
       thread_safe (~> 0.1)
     websocket-driver (0.7.0)