diff --git a/Gemfile b/Gemfile
index 6f22514..b900bd6 100644
--- a/Gemfile
+++ b/Gemfile
@@ -22,7 +22,7 @@ gem 'middleman-syntax', '~> 2.1.0'
 gem 'redcarpet', '~> 3.3.4'
 
 # For "summary"-Helper
-gem 'nokogiri', '~> 1.6.7.1'
+gem 'nokogiri', '~> 1.15.4'
 gem 'pry' 
 gem 'rake'
 
diff --git a/Gemfile.lock b/Gemfile.lock
index a74c81e..38e18e3 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -96,13 +96,14 @@ GEM
     middleman-syntax (2.1.0)
       middleman-core (>= 3.2)
       rouge (~> 1.0)
-    mini_portile2 (2.0.0)
+    mini_portile2 (2.8.4)
     minitest (5.10.1)
     neat (1.7.2)
       bourbon (>= 4.0)
       sass (>= 3.3)
-    nokogiri (1.6.7.2)
-      mini_portile2 (~> 2.0.0.rc2)
+    nokogiri (1.15.4)
+      mini_portile2 (~> 2.8.2)
+      racc (~> 1.4)
     padrino-helpers (0.13.3.3)
       i18n (~> 0.6, >= 0.6.7)
       padrino-support (= 0.13.3.3)
@@ -115,6 +116,7 @@ GEM
       method_source (~> 0.8.1)
       slop (~> 3.4)
     public_suffix (2.0.5)
+    racc (1.7.1)
     rack (2.0.1)
     rack-livereload (0.3.16)
       rack
@@ -151,7 +153,7 @@ DEPENDENCIES
   middleman-sprockets (~> 4.0.0.rc)
   middleman-syntax (~> 2.1.0)
   neat (= 1.7.2)
-  nokogiri (~> 1.6.7.1)
+  nokogiri (~> 1.15.4)
   pry
   rake
   redcarpet (~> 3.3.4)