diff --git a/Gemfile b/Gemfile
index d6be0c6..267172d 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,7 +1,7 @@
 source 'https://rubygems.org'
 
 # XML parser
-gem 'nokogiri', '~> 1.7'
+gem 'nokogiri', '~> 1.13'
 
 # Debugger
 gem 'pry-byebug'
diff --git a/Gemfile.lock b/Gemfile.lock
index d377536..fa250a0 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -4,9 +4,10 @@ GEM
     byebug (9.0.6)
     coderay (1.1.1)
     method_source (0.8.2)
-    mini_portile2 (2.1.0)
-    nokogiri (1.7.1)
-      mini_portile2 (~> 2.1.0)
+    mini_portile2 (2.8.0)
+    nokogiri (1.13.9)
+      mini_portile2 (~> 2.8.0)
+      racc (~> 1.4)
     pry (0.10.4)
       coderay (~> 1.1.0)
       method_source (~> 0.8.1)
@@ -14,13 +15,14 @@ GEM
     pry-byebug (3.4.2)
       byebug (~> 9.0)
       pry (~> 0.10)
+    racc (1.6.0)
     slop (3.6.0)
 
 PLATFORMS
   ruby
 
 DEPENDENCIES
-  nokogiri (~> 1.7)
+  nokogiri (~> 1.13)
   pry-byebug
 
 BUNDLED WITH