diff --git a/clients/google-api-services-chat/v1/2.0.0/README.md b/clients/google-api-services-chat/v1/2.0.0/README.md
index 7413531b96f..2ae0ea7bf3e 100644
--- a/clients/google-api-services-chat/v1/2.0.0/README.md
+++ b/clients/google-api-services-chat/v1/2.0.0/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-chat</artifactId>
-      <version>v1-rev20260510-2.0.0</version>
+      <version>v1-rev20260530-2.0.0</version>
     </dependency>
   </dependencies>
 </project>
@@ -35,7 +35,7 @@ repositories {
   mavenCentral()
 }
 dependencies {
-  implementation 'com.google.apis:google-api-services-chat:v1-rev20260510-2.0.0'
+  implementation 'com.google.apis:google-api-services-chat:v1-rev20260530-2.0.0'
 }
 ```
 
diff --git a/clients/google-api-services-chat/v1/2.0.0/com/google/api/services/chat/v1/model/Membership.java b/clients/google-api-services-chat/v1/2.0.0/com/google/api/services/chat/v1/model/Membership.java
index 3d7c83982bb..1e2b22ea335 100644
--- a/clients/google-api-services-chat/v1/2.0.0/com/google/api/services/chat/v1/model/Membership.java
+++ b/clients/google-api-services-chat/v1/2.0.0/com/google/api/services/chat/v1/model/Membership.java
@@ -30,6 +30,14 @@
 @SuppressWarnings("javadoc")
 public final class Membership extends com.google.api.client.json.GenericJson {
 
+  /**
+   * Output only. A user's relationship to the Workspace organization that owns the space. In spaces
+   * owned by consumer accounts, the affiliation of all members is `EXTERNAL`.
+   * The value may be {@code null}.
+   */
+  @com.google.api.client.util.Key
+  private java.lang.String affiliation;
+
   /**
    * Optional. Immutable. The creation time of the membership, such as when a member joined or was
    * invited to join a space. This field is output only, except when used to import historical
@@ -91,6 +99,25 @@ public final class Membership extends com.google.api.client.json.GenericJson {
   @com.google.api.client.util.Key
   private java.lang.String state;
 
+  /**
+   * Output only. A user's relationship to the Workspace organization that owns the space. In spaces
+   * owned by consumer accounts, the affiliation of all members is `EXTERNAL`.
+   * @return value or {@code null} for none
+   */
+  public java.lang.String getAffiliation() {
+    return affiliation;
+  }
+
+  /**
+   * Output only. A user's relationship to the Workspace organization that owns the space. In spaces
+   * owned by consumer accounts, the affiliation of all members is `EXTERNAL`.
+   * @param affiliation affiliation or {@code null} for none
+   */
+  public Membership setAffiliation(java.lang.String affiliation) {
+    this.affiliation = affiliation;
+    return this;
+  }
+
   /**
    * Optional. Immutable. The creation time of the membership, such as when a member joined or was
    * invited to join a space. This field is output only, except when used to import historical
diff --git a/clients/google-api-services-chat/v1/2.0.0/pom.xml b/clients/google-api-services-chat/v1/2.0.0/pom.xml
index 73a7909e4b2..9475573df89 100644
--- a/clients/google-api-services-chat/v1/2.0.0/pom.xml
+++ b/clients/google-api-services-chat/v1/2.0.0/pom.xml
@@ -8,8 +8,8 @@
 
   <groupId>com.google.apis</groupId>
   <artifactId>google-api-services-chat</artifactId>
-  <version>v1-rev20260510-2.0.0</version>
-  <name>Google Chat API v1-rev20260510-2.0.0</name>
+  <version>v1-rev20260530-2.0.0</version>
+  <name>Google Chat API v1-rev20260530-2.0.0</name>
   <packaging>jar</packaging>
 
   <inceptionYear>2011</inceptionYear>
diff --git a/clients/google-api-services-chat/v1/README.md b/clients/google-api-services-chat/v1/README.md
index 7413531b96f..2ae0ea7bf3e 100644
--- a/clients/google-api-services-chat/v1/README.md
+++ b/clients/google-api-services-chat/v1/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-chat</artifactId>
-      <version>v1-rev20260510-2.0.0</version>
+      <version>v1-rev20260530-2.0.0</version>
     </dependency>
   </dependencies>
 </project>
@@ -35,7 +35,7 @@ repositories {
   mavenCentral()
 }
 dependencies {
-  implementation 'com.google.apis:google-api-services-chat:v1-rev20260510-2.0.0'
+  implementation 'com.google.apis:google-api-services-chat:v1-rev20260530-2.0.0'
 }
 ```