diff --git a/CHANGELOG.md b/CHANGELOG.md
index c1acd769..78d21741 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,13 @@
 
 [1]: https://www.npmjs.com/package/@google-cloud/automl?activeTab=versions
 
+## [3.1.2](https://github.com/googleapis/nodejs-automl/compare/v3.1.1...v3.1.2) (2022-09-22)
+
+
+### Bug Fixes
+
+* Preserve default values in x-goog-request-params header ([#634](https://github.com/googleapis/nodejs-automl/issues/634)) ([1949bf9](https://github.com/googleapis/nodejs-automl/commit/1949bf9a26b63b4eefd13f5c6164691db46a0df2))
+
 ## [3.1.1](https://github.com/googleapis/nodejs-automl/compare/v3.1.0...v3.1.1) (2022-09-01)
 
 
diff --git a/package.json b/package.json
index 46cf1757..d7318b37 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
   "name": "@google-cloud/automl",
   "description": "Cloud AutoML API client for Node.js",
-  "version": "3.1.1",
+  "version": "3.1.2",
   "license": "Apache-2.0",
   "author": "Google LLC",
   "engines": {
diff --git a/samples/generated/v1/snippet_metadata.google.cloud.automl.v1.json b/samples/generated/v1/snippet_metadata.google.cloud.automl.v1.json
index 8ff5ef54..0e8c5678 100644
--- a/samples/generated/v1/snippet_metadata.google.cloud.automl.v1.json
+++ b/samples/generated/v1/snippet_metadata.google.cloud.automl.v1.json
@@ -1,7 +1,7 @@
 {
     "clientLibrary": {
         "name": "nodejs-automl",
-        "version": "3.1.1",
+        "version": "3.1.2",
         "language": "TYPESCRIPT",
         "apis": [
             {
diff --git a/samples/generated/v1beta1/snippet_metadata.google.cloud.automl.v1beta1.json b/samples/generated/v1beta1/snippet_metadata.google.cloud.automl.v1beta1.json
index 303bc697..8ab7fd20 100644
--- a/samples/generated/v1beta1/snippet_metadata.google.cloud.automl.v1beta1.json
+++ b/samples/generated/v1beta1/snippet_metadata.google.cloud.automl.v1beta1.json
@@ -1,7 +1,7 @@
 {
     "clientLibrary": {
         "name": "nodejs-automl",
-        "version": "3.1.1",
+        "version": "3.1.2",
         "language": "TYPESCRIPT",
         "apis": [
             {
diff --git a/samples/package.json b/samples/package.json
index ee237f62..7196e6e6 100644
--- a/samples/package.json
+++ b/samples/package.json
@@ -16,7 +16,7 @@
     "!test/"
   ],
   "dependencies": {
-    "@google-cloud/automl": "^3.1.1",
+    "@google-cloud/automl": "^3.1.2",
     "csv": "^6.0.0",
     "mathjs": "^11.0.0",
     "yargs": "^16.0.0"