diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index 1f0d8a9b..3e2bf498 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "0.4.0-beta.1"
+  ".": "0.4.1"
 }
\ No newline at end of file
diff --git a/CHANGELOG.md b/CHANGELOG.md
index ed1e1b91..437ee8b2 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,13 @@
 # Changelog
 
+## 0.4.1 (2025-05-23)
+
+Full Changelog: [v0.4.0-beta.1...v0.4.1](https://github.com/openai/openai-ruby/compare/v0.4.0-beta.1...v0.4.1)
+
+### Bug Fixes
+
+* prevent rubocop from mangling `===` to `is_a?` check ([c3a61c9](https://github.com/openai/openai-ruby/commit/c3a61c9f83b8cb79b41edadadca1a241de03d10f))
+
 ## 0.4.0-beta.1 (2025-05-23)
 
 Full Changelog: [v0.1.0-beta.2...v0.4.0-beta.1](https://github.com/openai/openai-ruby/compare/v0.1.0-beta.2...v0.4.0-beta.1)
diff --git a/Gemfile.lock b/Gemfile.lock
index 9496ce68..64aeded6 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -11,7 +11,7 @@ GIT
 PATH
   remote: .
   specs:
-    openai (0.4.0.pre.beta.1)
+    openai (0.4.1)
       connection_pool
 
 GEM
diff --git a/README.md b/README.md
index 84f09d30..d902b49a 100644
--- a/README.md
+++ b/README.md
@@ -15,7 +15,7 @@ To use this gem, install via Bundler by adding the following to your application
 <!-- x-release-please-start-version -->
 
 ```ruby
-gem "openai", "~> 0.4.0.pre.beta.1"
+gem "openai", "~> 0.4.1"
 ```
 
 <!-- x-release-please-end -->
diff --git a/lib/openai/internal/util.rb b/lib/openai/internal/util.rb
index c84c9e78..9e11d6ed 100644
--- a/lib/openai/internal/util.rb
+++ b/lib/openai/internal/util.rb
@@ -600,11 +600,13 @@ class << self
         #
         # @return [Object]
         def encode_content(headers, body)
+          # rubocop:disable Style/CaseEquality
+          # rubocop:disable Layout/LineLength
           content_type = headers["content-type"]
           case [content_type, body]
           in [OpenAI::Internal::Util::JSON_CONTENT, Hash | Array | -> { primitive?(_1) }]
             [headers, JSON.generate(body)]
-          in [OpenAI::Internal::Util::JSONL_CONTENT, Enumerable] unless body.is_a?(OpenAI::Internal::Type::FileInput)
+          in [OpenAI::Internal::Util::JSONL_CONTENT, Enumerable] unless OpenAI::Internal::Type::FileInput === body
             [headers, body.lazy.map { JSON.generate(_1) }]
           in [%r{^multipart/form-data}, Hash | OpenAI::Internal::Type::FileInput]
             boundary, strio = encode_multipart_streaming(body)
@@ -619,6 +621,8 @@ def encode_content(headers, body)
           else
             [headers, body]
           end
+          # rubocop:enable Layout/LineLength
+          # rubocop:enable Style/CaseEquality
         end
 
         # @api private
diff --git a/lib/openai/version.rb b/lib/openai/version.rb
index 03fe9c50..a71b9348 100644
--- a/lib/openai/version.rb
+++ b/lib/openai/version.rb
@@ -1,5 +1,5 @@
 # frozen_string_literal: true
 
 module OpenAI
-  VERSION = "0.4.0.pre.beta.1"
+  VERSION = "0.4.1"
 end