diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index d353515..788b0fa 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "0.21.0"
+  ".": "0.22.0"
 }
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5009e2d..52e610d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,11 @@
 # Release History
 
+### 0.22.0 (2026-06-04)
+
+#### Features
+
+* migrate from multi_json to standard json ([#273](https://github.com/googleapis/signet/issues/273)) ([bd067b2](https://github.com/googleapis/signet/commit/bd067b2a54442fbc9a1d084c3c78dc913bd3be86)), closes [#272](https://github.com/googleapis/signet/issues/272)
+
 ### 0.21.0 (2025-08-25)
 
 #### Features
diff --git a/lib/signet/version.rb b/lib/signet/version.rb
index 2766d8b..f90bf27 100644
--- a/lib/signet/version.rb
+++ b/lib/signet/version.rb
@@ -13,5 +13,5 @@
 #    limitations under the License.
 
 module Signet
-  VERSION = "0.21.0".freeze
+  VERSION = "0.22.0".freeze
 end