diff --git a/Gemfile b/Gemfile
index 222c3c5..422a607 100644
--- a/Gemfile
+++ b/Gemfile
@@ -2,7 +2,7 @@ source 'https://rubygems.org'
 
 # These were previously included in Ruby, but will be removed as of Ruby 3.4
 gem 'base64', '~> 0.2.0'
-gem 'bigdecimal', '~> 3.1.8'
+gem 'bigdecimal', '~> 3.1.9'
 
 gem 'jekyll-multiple-languages-plugin',
     github: 'perlun/jekyll-multiple-languages-plugin',
diff --git a/Gemfile.lock b/Gemfile.lock
index cbb9603..3305953 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -18,7 +18,7 @@ GEM
     addressable (2.8.7)
       public_suffix (>= 2.0.2, < 7.0)
     base64 (0.2.0)
-    bigdecimal (3.1.8)
+    bigdecimal (3.1.9)
     colorator (1.1.0)
     concurrent-ruby (1.3.3)
     csv (3.3.0)
@@ -101,7 +101,7 @@ PLATFORMS
 
 DEPENDENCIES
   base64 (~> 0.2.0)
-  bigdecimal (~> 3.1.8)
+  bigdecimal (~> 3.1.9)
   ffi (< 1.17.0)
   jekyll (~> 3.10)
   jekyll-multiple-languages-plugin!