diff --git a/Gemfile b/Gemfile
index 910370aeb3..6b11565a8b 100644
--- a/Gemfile
+++ b/Gemfile
@@ -108,7 +108,7 @@ gem 'httparty', '~> 0.22.0'
 gem 'slack-notifier', '~> 2.4.0'
 
 # css styles for emails
-gem 'css_parser', '~> 1.19.1' # dependency for premailer, set to higher version for ruby 3.3 support
+gem 'css_parser', '~> 1.21.0' # dependency for premailer, set to higher version for ruby 3.3 support
 gem 'nokogiri', '~> 1.17.2'
 gem 'premailer-rails', '~> 1.12.0'
 
diff --git a/Gemfile.lock b/Gemfile.lock
index ad64ced914..9f9b82e14c 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -137,7 +137,7 @@ GEM
       bigdecimal
       rexml
     crass (1.0.6)
-    css_parser (1.19.1)
+    css_parser (1.21.0)
       addressable
     cssbundling-rails (1.4.1)
       railties (>= 6.0.0)
@@ -582,7 +582,7 @@ DEPENDENCIES
   capistrano3-delayed-job (~> 1.7.6)
   capybara (~> 3.40.0)
   counter_culture (~> 3.8)
-  css_parser (~> 1.19.1)
+  css_parser (~> 1.21.0)
   cssbundling-rails (~> 1.4.1)
   dalli (~> 3.2.8)
   datadog (~> 2.8.0)