diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index 3d5f4e35..5457a012 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "4.5.0"
+  ".": "4.5.1"
 }
\ No newline at end of file
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8ccadc4b..2ac300c5 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,13 @@
 # Changelog
 
+## 4.5.1 (2026-05-14)
+
+Full Changelog: [v4.5.0...v4.5.1](https://github.com/imagekit-developer/imagekit-ruby/compare/v4.5.0...v4.5.1)
+
+### Bug Fixes
+
+* **client:** elide content type header on requests without body ([9ae7bf6](https://github.com/imagekit-developer/imagekit-ruby/commit/9ae7bf673a15fc01cf7e25b6c508dd20fa6a38f7))
+
 ## 4.5.0 (2026-05-13)
 
 Full Changelog: [v4.4.1...v4.5.0](https://github.com/imagekit-developer/imagekit-ruby/compare/v4.4.1...v4.5.0)
diff --git a/Gemfile.lock b/Gemfile.lock
index 088e7050..045ec1f6 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -11,7 +11,7 @@ GIT
 PATH
   remote: .
   specs:
-    imagekitio (4.5.0)
+    imagekitio (4.5.1)
       cgi
       connection_pool
       standardwebhooks
diff --git a/README.md b/README.md
index 7a03c787..03f91081 100644
--- a/README.md
+++ b/README.md
@@ -46,7 +46,7 @@ To use this gem, install via Bundler by adding the following to your application
 <!-- x-release-please-start-version -->
 
 ```ruby
-gem "imagekitio", "~> 4.5.0"
+gem "imagekitio", "~> 4.5.1"
 ```
 
 <!-- x-release-please-end -->
diff --git a/lib/imagekitio/internal/transport/base_client.rb b/lib/imagekitio/internal/transport/base_client.rb
index e9c0aea9..f6c722bd 100644
--- a/lib/imagekitio/internal/transport/base_client.rb
+++ b/lib/imagekitio/internal/transport/base_client.rb
@@ -306,6 +306,8 @@ def initialize(
               Imagekitio::Internal::Util.deep_merge(*[req[:body], opts[:extra_body]].compact)
             end
 
+          headers.delete("content-type") if body.nil?
+
           url = Imagekitio::Internal::Util.join_parsed_uri(
             @base_url_components,
             {**req, path: path, query: query}
diff --git a/lib/imagekitio/version.rb b/lib/imagekitio/version.rb
index fd555c92..7cfec8d1 100644
--- a/lib/imagekitio/version.rb
+++ b/lib/imagekitio/version.rb
@@ -1,5 +1,5 @@
 # frozen_string_literal: true
 
 module Imagekitio
-  VERSION = "4.5.0"
+  VERSION = "4.5.1"
 end
diff --git a/test/imagekitio/client_test.rb b/test/imagekitio/client_test.rb
index b17d0a02..aabeef38 100644
--- a/test/imagekitio/client_test.rb
+++ b/test/imagekitio/client_test.rb
@@ -280,8 +280,8 @@ def test_client_redirect_307
       assert_equal(recorded.method, _1.method)
       # assert_equal(recorded.body, _1.body) skipping, since the request body is multipart encoded
       assert_equal(
-        recorded.headers.transform_keys(&:downcase).fetch("content-type"),
-        _1.headers.transform_keys(&:downcase).fetch("content-type")
+        recorded.headers.transform_keys(&:downcase)["content-type"],
+        _1.headers.transform_keys(&:downcase)["content-type"]
       )
     end
   end
@@ -400,8 +400,9 @@ def test_default_headers
     image_kit.files.upload(file: StringIO.new("Example data"), file_name: "fileName")
 
     assert_requested(:any, /./) do |req|
-      headers = req.headers.transform_keys(&:downcase).fetch_values("accept", "content-type")
-      headers.each { refute_empty(_1) }
+      headers = req.headers.transform_keys(&:downcase)
+      expected = req.body.nil? ? ["accept"] : %w[accept content-type]
+      headers.fetch_values(*expected).each { refute_empty(_1) }
     end
   end
 end