diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index fa2e1752..6e1892f0 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  "owlbot-postprocessor": "0.12.0"
+  "owlbot-postprocessor": "0.12.1"
 }
diff --git a/owlbot-postprocessor/CHANGELOG.md b/owlbot-postprocessor/CHANGELOG.md
index 8dcf3caa..31d39dd0 100644
--- a/owlbot-postprocessor/CHANGELOG.md
+++ b/owlbot-postprocessor/CHANGELOG.md
@@ -1,5 +1,11 @@
 # Changelog
 
+### 0.12.1 (2026-08-17)
+
+#### Bug Fixes
+
+* upgrade json dependency to 2.19.2 and automate tag deprecation ([#458](https://github.com/googleapis/ruby-common-tools/issues/458)) 
+
 ### 0.12.0 (2026-08-04)
 
 #### Features
diff --git a/owlbot-postprocessor/lib/version.rb b/owlbot-postprocessor/lib/version.rb
index 2638e1e2..bf4a9add 100644
--- a/owlbot-postprocessor/lib/version.rb
+++ b/owlbot-postprocessor/lib/version.rb
@@ -15,5 +15,5 @@
 # limitations under the License.
 
 module OwlBot
-  VERSION = "0.12.0"
+  VERSION = "0.12.1"
 end