diff --git a/clients/google-api-services-dialogflow/v2/2.0.0/README.md b/clients/google-api-services-dialogflow/v2/2.0.0/README.md
index c4c0b1d9367..2b8802f0aba 100644
--- a/clients/google-api-services-dialogflow/v2/2.0.0/README.md
+++ b/clients/google-api-services-dialogflow/v2/2.0.0/README.md
@@ -22,7 +22,7 @@ Add the following lines to your `pom.xml` file:
     <dependency>
       <groupId>com.google.apis</groupId>
       <artifactId>google-api-services-dialogflow</artifactId>
-      <version>v2-rev20261018-2.9.2</version>
+      <version>v2-rev20261027-2.9.2</version>
     </dependency>
   </dependencies>
 </project>
@@ -35,7 +35,7 @@ repositories {
   mavenCentral()
 }
 dependencies {
-  implementation 'com.google.apis:google-api-services-dialogflow:v2-rev20261018-2.9.2'
+  implementation 'com.google.apis:google-api-services-dialogflow:v2-rev20261027-2.9.2'
 }
 ```
 
diff --git a/clients/google-api-services-dialogflow/v2/2.0.0/com/google/api/services/dialogflow/v2/model/GoogleCloudDialogflowV2InputAudioConfig.java b/clients/google-api-services-dialogflow/v2/2.0.0/com/google/api/services/dialogflow/v2/model/GoogleCloudDialogflowV2InputAudioConfig.java
index 6c9d1605ce8..9c1aabb247b 100644
--- a/clients/google-api-services-dialogflow/v2/2.0.0/com/google/api/services/dialogflow/v2/model/GoogleCloudDialogflowV2InputAudioConfig.java
+++ b/clients/google-api-services-dialogflow/v2/2.0.0/com/google/api/services/dialogflow/v2/model/GoogleCloudDialogflowV2InputAudioConfig.java
@@ -29,6 +29,12 @@
 @SuppressWarnings("javadoc")
 public final class GoogleCloudDialogflowV2InputAudioConfig extends com.google.api.client.json.GenericJson {
 
+  /**
+   * The value may be {@code null}.
+   */
+  @com.google.api.client.util.Key
+  private java.util.List<java.lang.String> alternativeLanguageCodes;
+
   /**
    * The value may be {@code null}.
    */
@@ -131,6 +137,21 @@ public final class GoogleCloudDialogflowV2InputAudioConfig extends com.google.ap
   @com.google.api.client.util.Key
   private java.lang.Boolean useGeminiAsr;
 
+  /**
+   * @return value or {@code null} for none
+   */
+  public java.util.List<java.lang.String> getAlternativeLanguageCodes() {
+    return alternativeLanguageCodes;
+  }
+
+  /**
+   * @param alternativeLanguageCodes alternativeLanguageCodes or {@code null} for none
+   */
+  public GoogleCloudDialogflowV2InputAudioConfig setAlternativeLanguageCodes(java.util.List<java.lang.String> alternativeLanguageCodes) {
+    this.alternativeLanguageCodes = alternativeLanguageCodes;
+    return this;
+  }
+
   /**
    * @return value or {@code null} for none
    */
diff --git a/clients/google-api-services-dialogflow/v2/2.0.0/com/google/api/services/dialogflow/v2/model/GoogleCloudDialogflowV2SpeechToTextConfig.java b/clients/google-api-services-dialogflow/v2/2.0.0/com/google/api/services/dialogflow/v2/model/GoogleCloudDialogflowV2SpeechToTextConfig.java
index ca0cdb9834a..f4251a8d320 100644
--- a/clients/google-api-services-dialogflow/v2/2.0.0/com/google/api/services/dialogflow/v2/model/GoogleCloudDialogflowV2SpeechToTextConfig.java
+++ b/clients/google-api-services-dialogflow/v2/2.0.0/com/google/api/services/dialogflow/v2/model/GoogleCloudDialogflowV2SpeechToTextConfig.java
@@ -29,6 +29,12 @@
 @SuppressWarnings("javadoc")
 public final class GoogleCloudDialogflowV2SpeechToTextConfig extends com.google.api.client.json.GenericJson {
 
+  /**
+   * The value may be {@code null}.
+   */
+  @com.google.api.client.util.Key
+  private java.util.List<java.lang.String> alternativeLanguageCodes;
+
   /**
    * The value may be {@code null}.
    */
@@ -95,6 +101,21 @@ public final class GoogleCloudDialogflowV2SpeechToTextConfig extends com.google.
   @com.google.api.client.util.Key
   private java.lang.Boolean useTimeoutBasedEndpointing;
 
+  /**
+   * @return value or {@code null} for none
+   */
+  public java.util.List<java.lang.String> getAlternativeLanguageCodes() {
+    return alternativeLanguageCodes;
+  }
+
+  /**
+   * @param alternativeLanguageCodes alternativeLanguageCodes or {@code null} for none
+   */
+  public GoogleCloudDialogflowV2SpeechToTextConfig setAlternativeLanguageCodes(java.util.List<java.lang.String> alternativeLanguageCodes) {
+    this.alternativeLanguageCodes = alternativeLanguageCodes;
+    return this;
+  }
+
   /**
    * @return value or {@code null} for none
    */
diff --git a/clients/google-api-services-dialogflow/v2/2.0.0/pom.xml b/clients/google-api-services-dialogflow/v2/2.0.0/pom.xml
index d647ddda24b..7b03fc24496 100644
--- a/clients/google-api-services-dialogflow/v2/2.0.0/pom.xml
+++ b/clients/google-api-services-dialogflow/v2/2.0.0/pom.xml
@@ -8,8 +8,8 @@
 
   <groupId>com.google.apis</groupId>
   <artifactId>google-api-services-dialogflow</artifactId>
-  <version>v2-rev20261018-2.9.2</version>
-  <name>Dialogflow API v2-rev20261018-2.9.2</name>
+  <version>v2-rev20261027-2.9.2</version>
+  <name>Dialogflow API v2-rev20261027-2.9.2</name>
   <packaging>jar</packaging>
 
   <inceptionYear>2011</inceptionYear>
diff --git a/clients/google-api-services-dialogflow/v2/README.md b/clients/google-api-services-dialogflow/v2/README.md
index c4c0b1d9367..2b8802f0aba 100644
--- a/clients/google-api-services-dialogflow/v2/README.md
+++ b/clients/google-api-services-dialogflow/v2/README.md
@@ -22,7 +22,7 @@ Add the following lines to your `pom.xml` file:
     <dependency>
       <groupId>com.google.apis</groupId>
       <artifactId>google-api-services-dialogflow</artifactId>
-      <version>v2-rev20261018-2.9.2</version>
+      <version>v2-rev20261027-2.9.2</version>
     </dependency>
   </dependencies>
 </project>
@@ -35,7 +35,7 @@ repositories {
   mavenCentral()
 }
 dependencies {
-  implementation 'com.google.apis:google-api-services-dialogflow:v2-rev20261018-2.9.2'
+  implementation 'com.google.apis:google-api-services-dialogflow:v2-rev20261027-2.9.2'
 }
 ```
 
diff --git a/clients/google-api-services-dialogflow/v2beta1/2.0.0/README.md b/clients/google-api-services-dialogflow/v2beta1/2.0.0/README.md
index b691fef6cf7..787ec8548d6 100644
--- a/clients/google-api-services-dialogflow/v2beta1/2.0.0/README.md
+++ b/clients/google-api-services-dialogflow/v2beta1/2.0.0/README.md
@@ -22,7 +22,7 @@ Add the following lines to your `pom.xml` file:
     <dependency>
       <groupId>com.google.apis</groupId>
       <artifactId>google-api-services-dialogflow</artifactId>
-      <version>v2beta1-rev20261018-2.9.2</version>
+      <version>v2beta1-rev20261027-2.9.2</version>
     </dependency>
   </dependencies>
 </project>
@@ -35,7 +35,7 @@ repositories {
   mavenCentral()
 }
 dependencies {
-  implementation 'com.google.apis:google-api-services-dialogflow:v2beta1-rev20261018-2.9.2'
+  implementation 'com.google.apis:google-api-services-dialogflow:v2beta1-rev20261027-2.9.2'
 }
 ```
 
diff --git a/clients/google-api-services-dialogflow/v2beta1/2.0.0/com/google/api/services/dialogflow/v2beta1/model/GoogleCloudDialogflowV2beta1InputAudioConfig.java b/clients/google-api-services-dialogflow/v2beta1/2.0.0/com/google/api/services/dialogflow/v2beta1/model/GoogleCloudDialogflowV2beta1InputAudioConfig.java
index c12156cf908..d5e764b5f86 100644
--- a/clients/google-api-services-dialogflow/v2beta1/2.0.0/com/google/api/services/dialogflow/v2beta1/model/GoogleCloudDialogflowV2beta1InputAudioConfig.java
+++ b/clients/google-api-services-dialogflow/v2beta1/2.0.0/com/google/api/services/dialogflow/v2beta1/model/GoogleCloudDialogflowV2beta1InputAudioConfig.java
@@ -29,6 +29,12 @@
 @SuppressWarnings("javadoc")
 public final class GoogleCloudDialogflowV2beta1InputAudioConfig extends com.google.api.client.json.GenericJson {
 
+  /**
+   * The value may be {@code null}.
+   */
+  @com.google.api.client.util.Key
+  private java.util.List<java.lang.String> alternativeLanguageCodes;
+
   /**
    * The value may be {@code null}.
    */
@@ -143,6 +149,21 @@ public final class GoogleCloudDialogflowV2beta1InputAudioConfig extends com.goog
   @com.google.api.client.util.Key
   private java.lang.Boolean useGeminiAsr;
 
+  /**
+   * @return value or {@code null} for none
+   */
+  public java.util.List<java.lang.String> getAlternativeLanguageCodes() {
+    return alternativeLanguageCodes;
+  }
+
+  /**
+   * @param alternativeLanguageCodes alternativeLanguageCodes or {@code null} for none
+   */
+  public GoogleCloudDialogflowV2beta1InputAudioConfig setAlternativeLanguageCodes(java.util.List<java.lang.String> alternativeLanguageCodes) {
+    this.alternativeLanguageCodes = alternativeLanguageCodes;
+    return this;
+  }
+
   /**
    * @return value or {@code null} for none
    */
diff --git a/clients/google-api-services-dialogflow/v2beta1/2.0.0/com/google/api/services/dialogflow/v2beta1/model/GoogleCloudDialogflowV2beta1SpeechToTextConfig.java b/clients/google-api-services-dialogflow/v2beta1/2.0.0/com/google/api/services/dialogflow/v2beta1/model/GoogleCloudDialogflowV2beta1SpeechToTextConfig.java
index e4fb39d2700..5a07b496b8a 100644
--- a/clients/google-api-services-dialogflow/v2beta1/2.0.0/com/google/api/services/dialogflow/v2beta1/model/GoogleCloudDialogflowV2beta1SpeechToTextConfig.java
+++ b/clients/google-api-services-dialogflow/v2beta1/2.0.0/com/google/api/services/dialogflow/v2beta1/model/GoogleCloudDialogflowV2beta1SpeechToTextConfig.java
@@ -29,6 +29,12 @@
 @SuppressWarnings("javadoc")
 public final class GoogleCloudDialogflowV2beta1SpeechToTextConfig extends com.google.api.client.json.GenericJson {
 
+  /**
+   * The value may be {@code null}.
+   */
+  @com.google.api.client.util.Key
+  private java.util.List<java.lang.String> alternativeLanguageCodes;
+
   /**
    * The value may be {@code null}.
    */
@@ -95,6 +101,21 @@ public final class GoogleCloudDialogflowV2beta1SpeechToTextConfig extends com.go
   @com.google.api.client.util.Key
   private java.lang.Boolean useTimeoutBasedEndpointing;
 
+  /**
+   * @return value or {@code null} for none
+   */
+  public java.util.List<java.lang.String> getAlternativeLanguageCodes() {
+    return alternativeLanguageCodes;
+  }
+
+  /**
+   * @param alternativeLanguageCodes alternativeLanguageCodes or {@code null} for none
+   */
+  public GoogleCloudDialogflowV2beta1SpeechToTextConfig setAlternativeLanguageCodes(java.util.List<java.lang.String> alternativeLanguageCodes) {
+    this.alternativeLanguageCodes = alternativeLanguageCodes;
+    return this;
+  }
+
   /**
    * @return value or {@code null} for none
    */
diff --git a/clients/google-api-services-dialogflow/v2beta1/2.0.0/pom.xml b/clients/google-api-services-dialogflow/v2beta1/2.0.0/pom.xml
index 9815ff88c0e..c424c0b5c9f 100644
--- a/clients/google-api-services-dialogflow/v2beta1/2.0.0/pom.xml
+++ b/clients/google-api-services-dialogflow/v2beta1/2.0.0/pom.xml
@@ -8,8 +8,8 @@
 
   <groupId>com.google.apis</groupId>
   <artifactId>google-api-services-dialogflow</artifactId>
-  <version>v2beta1-rev20261018-2.9.2</version>
-  <name>Dialogflow API v2beta1-rev20261018-2.9.2</name>
+  <version>v2beta1-rev20261027-2.9.2</version>
+  <name>Dialogflow API v2beta1-rev20261027-2.9.2</name>
   <packaging>jar</packaging>
 
   <inceptionYear>2011</inceptionYear>
diff --git a/clients/google-api-services-dialogflow/v2beta1/README.md b/clients/google-api-services-dialogflow/v2beta1/README.md
index b691fef6cf7..787ec8548d6 100644
--- a/clients/google-api-services-dialogflow/v2beta1/README.md
+++ b/clients/google-api-services-dialogflow/v2beta1/README.md
@@ -22,7 +22,7 @@ Add the following lines to your `pom.xml` file:
     <dependency>
       <groupId>com.google.apis</groupId>
       <artifactId>google-api-services-dialogflow</artifactId>
-      <version>v2beta1-rev20261018-2.9.2</version>
+      <version>v2beta1-rev20261027-2.9.2</version>
     </dependency>
   </dependencies>
 </project>
@@ -35,7 +35,7 @@ repositories {
   mavenCentral()
 }
 dependencies {
-  implementation 'com.google.apis:google-api-services-dialogflow:v2beta1-rev20261018-2.9.2'
+  implementation 'com.google.apis:google-api-services-dialogflow:v2beta1-rev20261027-2.9.2'
 }
 ```