diff --git a/Gemfile b/Gemfile
index e4f46d3..e1cbb9a 100644
--- a/Gemfile
+++ b/Gemfile
@@ -9,7 +9,7 @@ group :runtime, :cli do
 end
 
 group :runtime, :all do
-  gem 'cgi', '~> 0.4.0' # url decode / html escape
+  gem 'cgi', '~> 0.4.1' # url decode / html escape
   gem 'uri', '~> 0.13.0' # for argument parsing
 end
 
diff --git a/Gemfile.lock b/Gemfile.lock
index f75e0f7..1ddca88 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -9,7 +9,7 @@ GEM
   remote: https://rubygems.org/
   specs:
     ast (2.4.2)
-    cgi (0.4.0)
+    cgi (0.4.1)
     commonmarker (0.23.10)
     docopt (0.6.1)
     json (2.7.0)
@@ -49,7 +49,7 @@ PLATFORMS
 
 DEPENDENCIES
   bundler (~> 2.1)
-  cgi (~> 0.4.0)
+  cgi (~> 0.4.1)
   commonmarker (~> 0.23)
   ctf-party!
   docopt (~> 0.6)