diff --git a/packages/google-cloud-dialogflow/protos/google/cloud/dialogflow/v2beta1/environment.proto b/packages/google-cloud-dialogflow/protos/google/cloud/dialogflow/v2beta1/environment.proto
index d9cfbb9ed2f..da1c4b28772 100644
--- a/packages/google-cloud-dialogflow/protos/google/cloud/dialogflow/v2beta1/environment.proto
+++ b/packages/google-cloud-dialogflow/protos/google/cloud/dialogflow/v2beta1/environment.proto
@@ -88,12 +88,7 @@ message Environment {
 
   // Optional. The agent version loaded into this environment.
   // Format: `projects/<Project ID>/agent/versions/<Version ID>`.
-  string agent_version = 3 [
-    (google.api.field_behavior) = OPTIONAL,
-    (google.api.resource_reference) = {
-      type: "dialogflow.googleapis.com/Version"
-    }
-  ];
+  string agent_version = 3 [(google.api.field_behavior) = OPTIONAL];
 
   // Output only. The state of this environment. This field is read-only, i.e., it cannot be
   // set by create and update methods.
diff --git a/packages/google-cloud-dialogflow/protos/protos.json b/packages/google-cloud-dialogflow/protos/protos.json
index 28a9e8af63d..9bd1300c77c 100644
--- a/packages/google-cloud-dialogflow/protos/protos.json
+++ b/packages/google-cloud-dialogflow/protos/protos.json
@@ -3841,8 +3841,7 @@
                           "type": "string",
                           "id": 3,
                           "options": {
-                            "(google.api.field_behavior)": "OPTIONAL",
-                            "(google.api.resource_reference).type": "dialogflow.googleapis.com/Version"
+                            "(google.api.field_behavior)": "OPTIONAL"
                           }
                         },
                         "state": {
diff --git a/packages/google-cloud-dialogflow/synth.metadata b/packages/google-cloud-dialogflow/synth.metadata
index ac0f66e6734..1442bfbc368 100644
--- a/packages/google-cloud-dialogflow/synth.metadata
+++ b/packages/google-cloud-dialogflow/synth.metadata
@@ -11,8 +11,8 @@
       "git": {
         "name": "googleapis",
         "remote": "https://github.com/googleapis/googleapis.git",
-        "sha": "927ff51dcfbdf092d469083dc3964173851f5575",
-        "internalRef": "317983262"
+        "sha": "dc3682a7075d3028f00de866446fd0543ebc6079",
+        "internalRef": "318303567"
       }
     },
     {