diff --git a/CHANGELOG.md b/CHANGELOG.md
index b48684094..1a46e4d54 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,11 @@
 **See the full release notes on the official documentation website: https://www.elastic.co/docs/release-notes/elasticsearch/clients/ruby**
 
+# 9.1.2
+
+* Fixes [2758](https://github.com/elastic/elasticsearch-ruby/issues/2758) - `msearch`, `bulk` and other NDJSON endpoints overriding headers for `content-type` and `accept`. [Pull Request](https://github.com/elastic/elasticsearch-ruby/pull/2759).
+* Adds `transform.set_upgrade_mode`.
+* Updates source code documentation from latest 9.1 Elasticsearch specification.
+
 # 9.1.1
 
 ## Elasticsearch API
diff --git a/elasticsearch-api/lib/elasticsearch/api/version.rb b/elasticsearch-api/lib/elasticsearch/api/version.rb
index 1b4d097ef..f0cf8737d 100644
--- a/elasticsearch-api/lib/elasticsearch/api/version.rb
+++ b/elasticsearch-api/lib/elasticsearch/api/version.rb
@@ -17,7 +17,7 @@
 
 module Elasticsearch
   module API
-    VERSION = '9.1.1'.freeze
+    VERSION = '9.1.2'.freeze
     ES_SPECIFICATION_COMMIT = 'eeef9c87c1273e5dd3a5a313768bfa6728cd39cc'.freeze
   end
 end
diff --git a/elasticsearch/elasticsearch.gemspec b/elasticsearch/elasticsearch.gemspec
index c53b54801..fcabe9b95 100644
--- a/elasticsearch/elasticsearch.gemspec
+++ b/elasticsearch/elasticsearch.gemspec
@@ -46,7 +46,7 @@ Gem::Specification.new do |s|
   s.rdoc_options      = ['--charset=UTF-8']
 
   s.required_ruby_version = '>= 2.6' # For compatibility with JRuby 9.3
-  s.add_dependency 'elasticsearch-api', '9.1.1'
+  s.add_dependency 'elasticsearch-api', '9.1.2'
   s.add_dependency 'elastic-transport', '~> 8.3'
 
   s.add_development_dependency 'base64'
diff --git a/elasticsearch/lib/elasticsearch/version.rb b/elasticsearch/lib/elasticsearch/version.rb
index 0388c3b0f..9a4a791ce 100644
--- a/elasticsearch/lib/elasticsearch/version.rb
+++ b/elasticsearch/lib/elasticsearch/version.rb
@@ -16,5 +16,5 @@
 # under the License.
 
 module Elasticsearch
-  VERSION = '9.1.1'.freeze
+  VERSION = '9.1.2'.freeze
 end