diff --git a/.chronus/changes/python-test-additional-properties-2026-6-5-23-37-3.md b/.chronus/changes/python-test-additional-properties-2026-6-5-23-37-3.md
new file mode 100644
index 00000000000..29038b2e693
--- /dev/null
+++ b/.chronus/changes/python-test-additional-properties-2026-6-5-23-37-3.md
@@ -0,0 +1,7 @@
+---
+changeKind: internal
+packages:
+  - "@typespec/http-client-python"
+---
+
+Add Python SDK mock API tests for `type/property/additional-properties` scenarios, validating the `structuredClone` change from PR #10876.
diff --git a/packages/http-client-python/package-lock.json b/packages/http-client-python/package-lock.json
index 81826b56021..9a26a8d9a5d 100644
--- a/packages/http-client-python/package-lock.json
+++ b/packages/http-client-python/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "@typespec/http-client-python",
-  "version": "0.30.0",
+  "version": "0.30.1",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "@typespec/http-client-python",
-      "version": "0.30.0",
+      "version": "0.30.1",
       "hasInstallScript": true,
       "license": "MIT",
       "dependencies": {