diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index d0d087a3..6d9e5fc0 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "1.19.0"
+  ".": "1.20.0"
 }
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 36b1deb0..71718f6c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,12 @@
 # Changelog
 
+## [1.20.0](https://github.com/googleapis/python-dialogflow-cx/compare/v1.19.0...v1.20.0) (2023-03-01)
+
+
+### Features
+
+* Added persist_parameter_changes field from `query_params` to MatchIntentRequest ([#506](https://github.com/googleapis/python-dialogflow-cx/issues/506)) ([27f6020](https://github.com/googleapis/python-dialogflow-cx/commit/27f60205a3068df1a1576f120c97d45bb3501b2a))
+
 ## [1.19.0](https://github.com/googleapis/python-dialogflow-cx/compare/v1.18.0...v1.19.0) (2023-02-28)
 
 
diff --git a/google/cloud/dialogflowcx/gapic_version.py b/google/cloud/dialogflowcx/gapic_version.py
index 86f8ab82..4d61ace4 100644
--- a/google/cloud/dialogflowcx/gapic_version.py
+++ b/google/cloud/dialogflowcx/gapic_version.py
@@ -13,4 +13,4 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 #
-__version__ = "1.19.0"  # {x-release-please-version}
+__version__ = "1.20.0"  # {x-release-please-version}
diff --git a/google/cloud/dialogflowcx_v3/gapic_version.py b/google/cloud/dialogflowcx_v3/gapic_version.py
index 86f8ab82..4d61ace4 100644
--- a/google/cloud/dialogflowcx_v3/gapic_version.py
+++ b/google/cloud/dialogflowcx_v3/gapic_version.py
@@ -13,4 +13,4 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 #
-__version__ = "1.19.0"  # {x-release-please-version}
+__version__ = "1.20.0"  # {x-release-please-version}
diff --git a/google/cloud/dialogflowcx_v3beta1/gapic_version.py b/google/cloud/dialogflowcx_v3beta1/gapic_version.py
index 86f8ab82..4d61ace4 100644
--- a/google/cloud/dialogflowcx_v3beta1/gapic_version.py
+++ b/google/cloud/dialogflowcx_v3beta1/gapic_version.py
@@ -13,4 +13,4 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 #
-__version__ = "1.19.0"  # {x-release-please-version}
+__version__ = "1.20.0"  # {x-release-please-version}
diff --git a/google/cloud/dialogflowcx_v3beta1/types/session.py b/google/cloud/dialogflowcx_v3beta1/types/session.py
index e0025e9c..5fed55ce 100644
--- a/google/cloud/dialogflowcx_v3beta1/types/session.py
+++ b/google/cloud/dialogflowcx_v3beta1/types/session.py
@@ -1200,6 +1200,8 @@ class MatchIntentRequest(proto.Message):
             The parameters of this query.
         query_input (google.cloud.dialogflowcx_v3beta1.types.QueryInput):
             Required. The input specification.
+        persist_parameter_changes (bool):
+            Persist session parameter changes from ``query_params``.
     """
 
     session: str = proto.Field(
@@ -1216,6 +1218,10 @@ class MatchIntentRequest(proto.Message):
         number=3,
         message="QueryInput",
     )
+    persist_parameter_changes: bool = proto.Field(
+        proto.BOOL,
+        number=5,
+    )
 
 
 class MatchIntentResponse(proto.Message):
diff --git a/samples/generated_samples/snippet_metadata_google.cloud.dialogflow.cx.v3.json b/samples/generated_samples/snippet_metadata_google.cloud.dialogflow.cx.v3.json
index 7b8b2aa7..23a8c2b1 100644
--- a/samples/generated_samples/snippet_metadata_google.cloud.dialogflow.cx.v3.json
+++ b/samples/generated_samples/snippet_metadata_google.cloud.dialogflow.cx.v3.json
@@ -8,7 +8,7 @@
     ],
     "language": "PYTHON",
     "name": "google-cloud-dialogflow-cx",
-    "version": "1.19.0"
+    "version": "1.20.0"
   },
   "snippets": [
     {
diff --git a/samples/generated_samples/snippet_metadata_google.cloud.dialogflow.cx.v3beta1.json b/samples/generated_samples/snippet_metadata_google.cloud.dialogflow.cx.v3beta1.json
index 568546a7..a5689da3 100644
--- a/samples/generated_samples/snippet_metadata_google.cloud.dialogflow.cx.v3beta1.json
+++ b/samples/generated_samples/snippet_metadata_google.cloud.dialogflow.cx.v3beta1.json
@@ -8,7 +8,7 @@
     ],
     "language": "PYTHON",
     "name": "google-cloud-dialogflow-cx",
-    "version": "1.19.0"
+    "version": "1.20.0"
   },
   "snippets": [
     {
diff --git a/samples/snippets/requirements.txt b/samples/snippets/requirements.txt
index ba3cb8c1..97f35cfe 100644
--- a/samples/snippets/requirements.txt
+++ b/samples/snippets/requirements.txt
@@ -1,3 +1,3 @@
-google-cloud-dialogflow-cx==1.18.0
+google-cloud-dialogflow-cx==1.19.0
 Flask==2.2.3
 python-dateutil==2.8.2
diff --git a/scripts/fixup_dialogflowcx_v3beta1_keywords.py b/scripts/fixup_dialogflowcx_v3beta1_keywords.py
index 24a0ece5..a86e407c 100644
--- a/scripts/fixup_dialogflowcx_v3beta1_keywords.py
+++ b/scripts/fixup_dialogflowcx_v3beta1_keywords.py
@@ -113,7 +113,7 @@ class dialogflowcxCallTransformer(cst.CSTTransformer):
         'list_webhooks': ('parent', 'page_size', 'page_token', ),
         'load_version': ('name', 'allow_override_agent_resources', ),
         'lookup_environment_history': ('name', 'page_size', 'page_token', ),
-        'match_intent': ('session', 'query_input', 'query_params', ),
+        'match_intent': ('session', 'query_input', 'query_params', 'persist_parameter_changes', ),
         'restore_agent': ('name', 'agent_uri', 'agent_content', 'restore_option', ),
         'run_continuous_test': ('environment', ),
         'run_test_case': ('name', 'environment', ),