diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0421a50..9581252 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,12 @@
 # Changelog
 
+## [0.3.3](https://github.com/FlatIO/api-client-ruby/compare/v0.3.2...v0.3.3) (2024-03-08)
+
+
+### Bug Fixes
+
+* **gemspec:** only include lib/ to files list ([576cac9](https://github.com/FlatIO/api-client-ruby/commit/576cac92a848c7b3e4b712feb6429684ec3c16d2))
+
 ## [0.3.2](https://github.com/FlatIO/api-client-ruby/compare/v0.3.1...v0.3.2) (2024-03-08)
 
 
diff --git a/flat_api.gemspec b/flat_api.gemspec
index 821ac54..51cafcb 100644
--- a/flat_api.gemspec
+++ b/flat_api.gemspec
@@ -35,7 +35,7 @@ Gem::Specification.new do |s|
 
   s.add_development_dependency 'rspec', '~> 3.6', '>= 3.6.0'
 
-  s.files         = `find *`.split("\n").uniq.sort.select { |f| !f.empty? }
+  s.files         = Dir.glob("lib/**/*").sort.select { |f| !f.empty? }
   s.test_files    = `find spec/*`.split("\n")
   s.executables   = []
   s.require_paths = ["lib"]