diff --git a/CHANGELOG.md b/CHANGELOG.md
index cd7835d..da890fa 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,10 @@
 # Changelog
 
+## 1.5.0
+
+* Unnecessary files were removed from the published .gem. Pull request by
+  Orien Madgwick. GitHub #131.
+
 ## 1.4.0 (2025-11-20)
 
 * Ruby 3.2+ is now required. If you're using Ruby 3.0 or 3.1, please use
diff --git a/maxmind-geoip2.gemspec b/maxmind-geoip2.gemspec
index 6a388a9..eb9d5d4 100644
--- a/maxmind-geoip2.gemspec
+++ b/maxmind-geoip2.gemspec
@@ -7,7 +7,7 @@ require 'maxmind/geoip2/version'
 
 Gem::Specification.new do |s|
   s.authors     = ['William Storey']
-  s.files       = Dir['**/*'].difference(Dir['.github/**/*', 'dev-bin/**/*', 'test/**/*', 'CLAUDE.md', 'Gemfile*', 'Rakefile', '*.gemspec'])
+  s.files       = Dir['**/*'].difference(Dir['.github/**/*', 'dev-bin/**/*', 'test/**/*', 'CLAUDE.md', 'Gemfile*', 'Rakefile', '*.gemspec', 'README.dev.md'])
   s.name        = 'maxmind-geoip2'
   s.summary     = 'A gem for interacting with the GeoIP2 webservices and databases.'
   s.version     = MaxMind::GeoIP2::VERSION