diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index 6bcf1742..d9c09cbe 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  "owlbot-postprocessor": "0.12.3"
+  "owlbot-postprocessor": "0.12.4"
 }
diff --git a/owlbot-postprocessor/CHANGELOG.md b/owlbot-postprocessor/CHANGELOG.md
index 47b07cd3..ba2439a5 100644
--- a/owlbot-postprocessor/CHANGELOG.md
+++ b/owlbot-postprocessor/CHANGELOG.md
@@ -1,5 +1,11 @@
 # Changelog
 
+### 0.12.4 (2026-08-24)
+
+#### Bug Fixes
+
+* remove default json gemspec to clear CVE ([#464](https://github.com/googleapis/ruby-common-tools/issues/464)) 
+
 ### 0.12.3 (2026-08-17)
 
 #### Bug Fixes
diff --git a/owlbot-postprocessor/lib/version.rb b/owlbot-postprocessor/lib/version.rb
index 7ee4ed7d..1a6bb691 100644
--- a/owlbot-postprocessor/lib/version.rb
+++ b/owlbot-postprocessor/lib/version.rb
@@ -15,5 +15,5 @@
 # limitations under the License.
 
 module OwlBot
-  VERSION = "0.12.3"
+  VERSION = "0.12.4"
 end