diff --git a/_data/downloads.yml b/_data/downloads.yml
index 6164ba7a79..84ba843d3a 100644
--- a/_data/downloads.yml
+++ b/_data/downloads.yml
@@ -9,7 +9,7 @@ preview:
 stable:
 
   - 4.0.9
-  - 3.4.11
+  - 3.4.12
 
 # optional
 security_maintenance:
diff --git a/_data/releases.yml b/_data/releases.yml
index 571a68b69d..df176517c4 100644
--- a/_data/releases.yml
+++ b/_data/releases.yml
@@ -388,6 +388,30 @@
 
 # 3.4 series
 
+- version: 3.4.12
+  date: 2026-10-23
+  post: /en/news/2026/10/23/ruby-3-4-12-released/
+  url:
+    gz:  https://cache.ruby-lang.org/pub/ruby/3.4/ruby-3.4.12.tar.gz
+    zip: https://cache.ruby-lang.org/pub/ruby/3.4/ruby-3.4.12.zip
+    xz:  https://cache.ruby-lang.org/pub/ruby/3.4/ruby-3.4.12.tar.xz
+  size:
+    gz:  22498017
+    zip: 27719665
+    xz:  16732860
+  sha1:
+    gz:  8ead0b008d7cdeb543282489e7574324ab62939f
+    zip: c4381ce52fba1af02944cedb35eac569976bfdb8
+    xz:  bf42a4909e1517a2fee26eebbd840bbef3181c61
+  sha256:
+    gz:  5e5d85ad93b0adcccbad47733680f4892bd0078e3342437f7babce01c1872479
+    zip: b1bec4f3a2b0c47f349a102b013f1c8f345b9991388e75368d1178ac4f9cfc0e
+    xz:  db6c147940d7ad0b706823d42c8e6713c36dec70a1f83f635f1d3a7f0599ec90
+  sha512:
+    gz:  7d4fcf4b57f94974091df406e159ccfd8460e75bd7593993d9d4172a8ad673388bb8505ddb41377014dce4df6d358e019d4fa4098b535aa705e790f65962f1cd
+    zip: 21573c2ba656984c006c8f499f3498c5208eba17d862d93269221c1e7295ace4e5034a53b23931d6b9585c4fc98ecd9b1196b81c2b58543d83550ea60fdc014e
+    xz:  7866ed652921f9f0d601e1e323d29fddee3506cfd89e258cab7601786bffec8a17245468d517d246ecfa7fa9a982b73cfff0aaf6534444753e8b6add297bfbd3
+
 - version: 3.4.11
   date: 2026-09-23
   post: /en/news/2026/09/23/ruby-3-4-11-released/
diff --git a/en/news/_posts/2026-10-23-ruby-3-4-12-released.md b/en/news/_posts/2026-10-23-ruby-3-4-12-released.md
new file mode 100644
index 0000000000..08a0c6adf6
--- /dev/null
+++ b/en/news/_posts/2026-10-23-ruby-3-4-12-released.md
@@ -0,0 +1,48 @@
+---
+layout: news_post
+title: "Ruby 3.4.12 Released"
+author: nagachika
+translator:
+date: 2026-10-23 03:50:27 +0000
+lang: en
+---
+
+Ruby 3.4.12 has been released.
+
+This release includes fixes for bugs in Regexp compilation that GitLab's CVE-2026-89078, CVE-2026-93577, CVE-2026-97229 and CVE-2026-110264 rely on.
+Please see the topic below for details.
+
+* [Regexp compilation fixes related to GitLab's CVE-2026-89078, CVE-2026-93577, CVE-2026-97229 and CVE-2026-110264]({% link en/news/_posts/2026-10-23-regexp-fixes-for-gitlab-cves.md %})
+
+This release also includes other bugfixes.
+Please see the [GitHub releases](https://github.com/ruby/ruby/releases/tag/v3_4_12) for further details.
+
+## Download
+
+{% assign release = site.data.releases | where: "version", "3.4.12" | first %}
+
+* <{{ release.url.gz }}>
+
+      SIZE: {{ release.size.gz }}
+      SHA1: {{ release.sha1.gz }}
+      SHA256: {{ release.sha256.gz }}
+      SHA512: {{ release.sha512.gz }}
+
+* <{{ release.url.xz }}>
+
+      SIZE: {{ release.size.xz }}
+      SHA1: {{ release.sha1.xz }}
+      SHA256: {{ release.sha256.xz }}
+      SHA512: {{ release.sha512.xz }}
+
+* <{{ release.url.zip }}>
+
+      SIZE: {{ release.size.zip }}
+      SHA1: {{ release.sha1.zip }}
+      SHA256: {{ release.sha256.zip }}
+      SHA512: {{ release.sha512.zip }}
+
+## Release Comment
+
+Many committers, developers, and users who provided bug reports helped us make this release.
+Thanks for their contributions.