diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index 866e93f..dd8fde7 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "1.4.3"
+  ".": "1.5.0"
 }
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 37483a5..c827dcc 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,18 @@
 # Changelog
 
+## [1.5.0](https://github.com/googleapis/python-optimization/compare/v1.4.3...v1.5.0) (2023-09-13)
+
+
+### Features
+
+* Added support for walking mode and cost_per_kilometer_below_soft_max ([4095c0c](https://github.com/googleapis/python-optimization/commit/4095c0c17943f5fe833f411f11774305c5534377))
+
+
+### Documentation
+
+* Minor formatting ([a1952d2](https://github.com/googleapis/python-optimization/commit/a1952d2e272e774d3e1dfeef2c9b8ee8dc63a86d))
+* Minor formatting fix ([#148](https://github.com/googleapis/python-optimization/issues/148)) ([946f557](https://github.com/googleapis/python-optimization/commit/946f55708e81a45e7ed876fc22786c3490c60517))
+
 ## [1.4.3](https://github.com/googleapis/python-optimization/compare/v1.4.2...v1.4.3) (2023-08-16)
 
 
diff --git a/google/cloud/optimization/gapic_version.py b/google/cloud/optimization/gapic_version.py
index 178df4b..997edc1 100644
--- a/google/cloud/optimization/gapic_version.py
+++ b/google/cloud/optimization/gapic_version.py
@@ -13,4 +13,4 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 #
-__version__ = "1.4.3"  # {x-release-please-version}
+__version__ = "1.5.0"  # {x-release-please-version}
diff --git a/google/cloud/optimization_v1/gapic_version.py b/google/cloud/optimization_v1/gapic_version.py
index 178df4b..997edc1 100644
--- a/google/cloud/optimization_v1/gapic_version.py
+++ b/google/cloud/optimization_v1/gapic_version.py
@@ -13,4 +13,4 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 #
-__version__ = "1.4.3"  # {x-release-please-version}
+__version__ = "1.5.0"  # {x-release-please-version}
diff --git a/samples/generated_samples/snippet_metadata_google.cloud.optimization.v1.json b/samples/generated_samples/snippet_metadata_google.cloud.optimization.v1.json
index d38082d..13b5f0d 100644
--- a/samples/generated_samples/snippet_metadata_google.cloud.optimization.v1.json
+++ b/samples/generated_samples/snippet_metadata_google.cloud.optimization.v1.json
@@ -8,7 +8,7 @@
     ],
     "language": "PYTHON",
     "name": "google-cloud-optimization",
-    "version": "0.1.0"
+    "version": "1.5.0"
   },
   "snippets": [
     {