diff --git a/CHANGELOG.md b/CHANGELOG.md
index e2d40ff7e..f04c145d6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,26 @@
 # Changelog
 
+## [3.31.9](https://github.com/googleapis/java-firestore/compare/v3.31.8...v3.31.9) (2025-07-11)
+
+
+### Bug Fixes
+
+* Improve performance of the UTF-8 string comparison logic. ([#2182](https://github.com/googleapis/java-firestore/issues/2182)) ([869a381](https://github.com/googleapis/java-firestore/commit/869a3814511f9a6e15641b3279bb871867886940))
+
+
+### Dependencies
+
+* Update dependency com.diffplug.spotless:spotless-maven-plugin to v2.45.0 ([#2184](https://github.com/googleapis/java-firestore/issues/2184)) ([88097cb](https://github.com/googleapis/java-firestore/commit/88097cbe8878b45897c89e102fa82e1975d2d74b))
+* Update dependency com.google.cloud:sdk-platform-java-config to v3.50.1 ([#2186](https://github.com/googleapis/java-firestore/issues/2186)) ([466e597](https://github.com/googleapis/java-firestore/commit/466e597c282533c0e500b57d27f386ef9ea99e5e))
+* Update dependency org.apache.commons:commons-lang3 to v3.18.0 ([#2187](https://github.com/googleapis/java-firestore/issues/2187)) ([1f3c20b](https://github.com/googleapis/java-firestore/commit/1f3c20b1923c3ae000359be91e7e39458c36ce2e))
+* Update googleapis/sdk-platform-java action to v2.60.0 ([#2176](https://github.com/googleapis/java-firestore/issues/2176)) ([8283a08](https://github.com/googleapis/java-firestore/commit/8283a08b1749e06864b50ab1813c13e9eb61c087))
+* Update googleapis/sdk-platform-java action to v2.60.1 ([#2181](https://github.com/googleapis/java-firestore/issues/2181)) ([be9daba](https://github.com/googleapis/java-firestore/commit/be9dabab8467a5aa3986d34f393d597d670af029))
+
+
+### Documentation
+
+* Add an example to the detailed comment in compareUtf8Strings() ([#2183](https://github.com/googleapis/java-firestore/issues/2183)) ([e16b158](https://github.com/googleapis/java-firestore/commit/e16b15853d6545c3c1476086c3bc88cb46991718))
+
 ## [3.31.8](https://github.com/googleapis/java-firestore/compare/v3.31.7...v3.31.8) (2025-07-02)
 
 
diff --git a/README.md b/README.md
index 0a9d6c379..9e98fb613 100644
--- a/README.md
+++ b/README.md
@@ -56,13 +56,13 @@ implementation 'com.google.cloud:google-cloud-firestore'
 If you are using Gradle without BOM, add this to your dependencies:
 
 ```Groovy
-implementation 'com.google.cloud:google-cloud-firestore:3.31.8'
+implementation 'com.google.cloud:google-cloud-firestore:3.31.9'
 ```
 
 If you are using SBT, add this to your dependencies:
 
 ```Scala
-libraryDependencies += "com.google.cloud" % "google-cloud-firestore" % "3.31.8"
+libraryDependencies += "com.google.cloud" % "google-cloud-firestore" % "3.31.9"
 ```
 
 ## Authentication
@@ -219,7 +219,7 @@ Java is a registered trademark of Oracle and/or its affiliates.
 [kokoro-badge-link-5]: http://storage.googleapis.com/cloud-devrel-public/java/badges/java-firestore/java11.html
 [stability-image]: https://img.shields.io/badge/stability-stable-green
 [maven-version-image]: https://img.shields.io/maven-central/v/com.google.cloud/google-cloud-firestore.svg
-[maven-version-link]: https://central.sonatype.com/artifact/com.google.cloud/google-cloud-firestore/3.31.8
+[maven-version-link]: https://central.sonatype.com/artifact/com.google.cloud/google-cloud-firestore/3.31.9
 [authentication]: https://github.com/googleapis/google-cloud-java#authentication
 [auth-scopes]: https://developers.google.com/identity/protocols/oauth2/scopes
 [predefined-iam-roles]: https://cloud.google.com/iam/docs/understanding-roles#predefined_roles
diff --git a/google-cloud-firestore-admin/pom.xml b/google-cloud-firestore-admin/pom.xml
index 4a52458df..b843fd0ee 100644
--- a/google-cloud-firestore-admin/pom.xml
+++ b/google-cloud-firestore-admin/pom.xml
@@ -4,7 +4,7 @@
          xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
   <modelVersion>4.0.0</modelVersion>
   <artifactId>google-cloud-firestore-admin</artifactId>
-  <version>3.31.9-SNAPSHOT</version><!-- {x-version-update:google-cloud-firestore-admin:current} -->
+  <version>3.31.9</version><!-- {x-version-update:google-cloud-firestore-admin:current} -->
   <packaging>jar</packaging>
   <name>Google Cloud Firestore Admin Client</name>
   <url>https://github.com/googleapis/java-firestore</url>
@@ -14,7 +14,7 @@
   <parent>
     <groupId>com.google.cloud</groupId>
     <artifactId>google-cloud-firestore-parent</artifactId>
-    <version>3.31.9-SNAPSHOT</version><!-- {x-version-update:google-cloud-firestore:current} -->
+    <version>3.31.9</version><!-- {x-version-update:google-cloud-firestore:current} -->
   </parent>
   <dependencies>
     <dependency>
diff --git a/google-cloud-firestore-bom/pom.xml b/google-cloud-firestore-bom/pom.xml
index 392b1a3f4..6990e2839 100644
--- a/google-cloud-firestore-bom/pom.xml
+++ b/google-cloud-firestore-bom/pom.xml
@@ -3,7 +3,7 @@
   <modelVersion>4.0.0</modelVersion>
   <groupId>com.google.cloud</groupId>
   <artifactId>google-cloud-firestore-bom</artifactId>
-  <version>3.31.9-SNAPSHOT</version><!-- {x-version-update:google-cloud-firestore-bom:current} -->
+  <version>3.31.9</version><!-- {x-version-update:google-cloud-firestore-bom:current} -->
   <packaging>pom</packaging>
   <parent>
     <groupId>com.google.cloud</groupId>
@@ -52,37 +52,37 @@
       <dependency>
         <groupId>com.google.cloud</groupId>
         <artifactId>google-cloud-firestore</artifactId>
-        <version>3.31.9-SNAPSHOT</version><!-- {x-version-update:google-cloud-firestore:current} -->
+        <version>3.31.9</version><!-- {x-version-update:google-cloud-firestore:current} -->
       </dependency>
       <dependency>
         <groupId>com.google.cloud</groupId>
         <artifactId>google-cloud-firestore-admin</artifactId>
-        <version>3.31.9-SNAPSHOT</version><!-- {x-version-update:google-cloud-firestore-admin:current} -->
+        <version>3.31.9</version><!-- {x-version-update:google-cloud-firestore-admin:current} -->
       </dependency>
       <dependency>
         <groupId>com.google.api.grpc</groupId>
         <artifactId>grpc-google-cloud-firestore-admin-v1</artifactId>
-        <version>3.31.9-SNAPSHOT</version><!-- {x-version-update:grpc-google-cloud-firestore-admin-v1:current} -->
+        <version>3.31.9</version><!-- {x-version-update:grpc-google-cloud-firestore-admin-v1:current} -->
       </dependency>
       <dependency>
         <groupId>com.google.api.grpc</groupId>
         <artifactId>grpc-google-cloud-firestore-v1</artifactId>
-        <version>3.31.9-SNAPSHOT</version><!-- {x-version-update:grpc-google-cloud-firestore-v1:current} -->
+        <version>3.31.9</version><!-- {x-version-update:grpc-google-cloud-firestore-v1:current} -->
       </dependency>
       <dependency>
         <groupId>com.google.api.grpc</groupId>
         <artifactId>proto-google-cloud-firestore-admin-v1</artifactId>
-        <version>3.31.9-SNAPSHOT</version><!-- {x-version-update:proto-google-cloud-firestore-admin-v1:current} -->
+        <version>3.31.9</version><!-- {x-version-update:proto-google-cloud-firestore-admin-v1:current} -->
       </dependency>
       <dependency>
         <groupId>com.google.api.grpc</groupId>
         <artifactId>proto-google-cloud-firestore-v1</artifactId>
-        <version>3.31.9-SNAPSHOT</version><!-- {x-version-update:proto-google-cloud-firestore-v1:current} -->
+        <version>3.31.9</version><!-- {x-version-update:proto-google-cloud-firestore-v1:current} -->
       </dependency>
       <dependency>
         <groupId>com.google.cloud</groupId>
         <artifactId>proto-google-cloud-firestore-bundle-v1</artifactId>
-        <version>3.31.9-SNAPSHOT</version><!-- {x-version-update:proto-google-cloud-firestore-bundle-v1:current} -->
+        <version>3.31.9</version><!-- {x-version-update:proto-google-cloud-firestore-bundle-v1:current} -->
       </dependency>
     </dependencies>
   </dependencyManagement>
diff --git a/google-cloud-firestore/pom.xml b/google-cloud-firestore/pom.xml
index 145970f6e..a57b746de 100644
--- a/google-cloud-firestore/pom.xml
+++ b/google-cloud-firestore/pom.xml
@@ -2,7 +2,7 @@
 <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
   <modelVersion>4.0.0</modelVersion>
   <artifactId>google-cloud-firestore</artifactId>
-  <version>3.31.9-SNAPSHOT</version><!-- {x-version-update:google-cloud-firestore:current} -->
+  <version>3.31.9</version><!-- {x-version-update:google-cloud-firestore:current} -->
   <packaging>jar</packaging>
   <name>Google Cloud Firestore</name>
   <url>https://github.com/googleapis/java-firestore</url>
@@ -12,7 +12,7 @@
   <parent>
     <groupId>com.google.cloud</groupId>
     <artifactId>google-cloud-firestore-parent</artifactId>
-    <version>3.31.9-SNAPSHOT</version><!-- {x-version-update:google-cloud-firestore:current} -->
+    <version>3.31.9</version><!-- {x-version-update:google-cloud-firestore:current} -->
   </parent>
   <properties>
     <site.installationModule>google-cloud-firestore</site.installationModule>
diff --git a/grpc-google-cloud-firestore-admin-v1/pom.xml b/grpc-google-cloud-firestore-admin-v1/pom.xml
index 4ce634b9d..2e7df92f1 100644
--- a/grpc-google-cloud-firestore-admin-v1/pom.xml
+++ b/grpc-google-cloud-firestore-admin-v1/pom.xml
@@ -4,13 +4,13 @@
     <modelVersion>4.0.0</modelVersion>
     <groupId>com.google.api.grpc</groupId>
     <artifactId>grpc-google-cloud-firestore-admin-v1</artifactId>
-    <version>3.31.9-SNAPSHOT</version><!-- {x-version-update:grpc-google-cloud-firestore-admin-v1:current} -->
+    <version>3.31.9</version><!-- {x-version-update:grpc-google-cloud-firestore-admin-v1:current} -->
     <name>grpc-google-cloud-firestore-admin-v1</name>
     <description>GRPC library for grpc-google-cloud-firestore-admin-v1</description>
     <parent>
         <groupId>com.google.cloud</groupId>
         <artifactId>google-cloud-firestore-parent</artifactId>
-        <version>3.31.9-SNAPSHOT</version><!-- {x-version-update:google-cloud-firestore:current} -->
+        <version>3.31.9</version><!-- {x-version-update:google-cloud-firestore:current} -->
     </parent>
     <dependencies>
         <dependency>
diff --git a/grpc-google-cloud-firestore-v1/pom.xml b/grpc-google-cloud-firestore-v1/pom.xml
index 7580111f8..e99a7593d 100644
--- a/grpc-google-cloud-firestore-v1/pom.xml
+++ b/grpc-google-cloud-firestore-v1/pom.xml
@@ -4,13 +4,13 @@
     <modelVersion>4.0.0</modelVersion>
     <groupId>com.google.api.grpc</groupId>
     <artifactId>grpc-google-cloud-firestore-v1</artifactId>
-    <version>3.31.9-SNAPSHOT</version><!-- {x-version-update:grpc-google-cloud-firestore-v1:current} -->
+    <version>3.31.9</version><!-- {x-version-update:grpc-google-cloud-firestore-v1:current} -->
     <name>grpc-google-cloud-firestore-v1</name>
     <description>GRPC library for grpc-google-cloud-firestore-v1</description>
     <parent>
         <groupId>com.google.cloud</groupId>
         <artifactId>google-cloud-firestore-parent</artifactId>
-        <version>3.31.9-SNAPSHOT</version><!-- {x-version-update:google-cloud-firestore:current} -->
+        <version>3.31.9</version><!-- {x-version-update:google-cloud-firestore:current} -->
     </parent>
     <dependencies>
         <dependency>
diff --git a/pom.xml b/pom.xml
index 3cd97ef6b..8487ece92 100644
--- a/pom.xml
+++ b/pom.xml
@@ -4,7 +4,7 @@
   <groupId>com.google.cloud</groupId>
   <artifactId>google-cloud-firestore-parent</artifactId>
   <packaging>pom</packaging>
-  <version>3.31.9-SNAPSHOT</version><!-- {x-version-update:google-cloud-firestore:current} -->
+  <version>3.31.9</version><!-- {x-version-update:google-cloud-firestore:current} -->
   <name>Google Cloud Firestore Parent</name>
   <url>https://github.com/googleapis/java-firestore</url>
   <description>
@@ -150,32 +150,32 @@
       <dependency>
         <groupId>com.google.api.grpc</groupId>
         <artifactId>proto-google-cloud-firestore-admin-v1</artifactId>
-        <version>3.31.9-SNAPSHOT</version><!-- {x-version-update:proto-google-cloud-firestore-admin-v1:current} -->
+        <version>3.31.9</version><!-- {x-version-update:proto-google-cloud-firestore-admin-v1:current} -->
       </dependency>
       <dependency>
         <groupId>com.google.cloud</groupId>
         <artifactId>google-cloud-firestore</artifactId>
-        <version>3.31.9-SNAPSHOT</version><!-- {x-version-update:google-cloud-firestore:current} -->
+        <version>3.31.9</version><!-- {x-version-update:google-cloud-firestore:current} -->
       </dependency>
       <dependency>
         <groupId>com.google.cloud</groupId>
         <artifactId>proto-google-cloud-firestore-bundle-v1</artifactId>
-        <version>3.31.9-SNAPSHOT</version><!-- {x-version-update:google-cloud-firestore:current} -->
+        <version>3.31.9</version><!-- {x-version-update:google-cloud-firestore:current} -->
       </dependency>
       <dependency>
         <groupId>com.google.api.grpc</groupId>
         <artifactId>proto-google-cloud-firestore-v1</artifactId>
-        <version>3.31.9-SNAPSHOT</version><!-- {x-version-update:proto-google-cloud-firestore-v1:current} -->
+        <version>3.31.9</version><!-- {x-version-update:proto-google-cloud-firestore-v1:current} -->
       </dependency>
       <dependency>
         <groupId>com.google.api.grpc</groupId>
         <artifactId>grpc-google-cloud-firestore-admin-v1</artifactId>
-        <version>3.31.9-SNAPSHOT</version><!-- {x-version-update:grpc-google-cloud-firestore-admin-v1:current} -->
+        <version>3.31.9</version><!-- {x-version-update:grpc-google-cloud-firestore-admin-v1:current} -->
       </dependency>
       <dependency>
         <groupId>com.google.api.grpc</groupId>
         <artifactId>grpc-google-cloud-firestore-v1</artifactId>
-        <version>3.31.9-SNAPSHOT</version><!-- {x-version-update:grpc-google-cloud-firestore-v1:current} -->
+        <version>3.31.9</version><!-- {x-version-update:grpc-google-cloud-firestore-v1:current} -->
       </dependency>
 
       <dependency>
diff --git a/proto-google-cloud-firestore-admin-v1/pom.xml b/proto-google-cloud-firestore-admin-v1/pom.xml
index ea7cb0de7..09e3b2451 100644
--- a/proto-google-cloud-firestore-admin-v1/pom.xml
+++ b/proto-google-cloud-firestore-admin-v1/pom.xml
@@ -4,13 +4,13 @@
     <modelVersion>4.0.0</modelVersion>
     <groupId>com.google.api.grpc</groupId>
     <artifactId>proto-google-cloud-firestore-admin-v1</artifactId>
-    <version>3.31.9-SNAPSHOT</version><!-- {x-version-update:proto-google-cloud-firestore-admin-v1:current} -->
+    <version>3.31.9</version><!-- {x-version-update:proto-google-cloud-firestore-admin-v1:current} -->
     <name>proto-google-cloud-firestore-admin-v1</name>
     <description>PROTO library for proto-google-cloud-firestore-admin-v1</description>
     <parent>
         <groupId>com.google.cloud</groupId>
         <artifactId>google-cloud-firestore-parent</artifactId>
-        <version>3.31.9-SNAPSHOT</version><!-- {x-version-update:google-cloud-firestore:current} -->
+        <version>3.31.9</version><!-- {x-version-update:google-cloud-firestore:current} -->
     </parent>
     <dependencies>
         <dependency>
diff --git a/proto-google-cloud-firestore-bundle-v1/pom.xml b/proto-google-cloud-firestore-bundle-v1/pom.xml
index ea4edbc5e..d51249f92 100644
--- a/proto-google-cloud-firestore-bundle-v1/pom.xml
+++ b/proto-google-cloud-firestore-bundle-v1/pom.xml
@@ -5,14 +5,14 @@
     <modelVersion>4.0.0</modelVersion>
 
     <artifactId>proto-google-cloud-firestore-bundle-v1</artifactId>
-    <version>3.31.9-SNAPSHOT</version><!-- {x-version-update:google-cloud-firestore:current} -->
+    <version>3.31.9</version><!-- {x-version-update:google-cloud-firestore:current} -->
 
     <name>proto-google-cloud-firestore-bundle-v1</name>
     <description>PROTO library for proto-google-cloud-firestore-bundle-v1</description>
     <parent>
         <groupId>com.google.cloud</groupId>
         <artifactId>google-cloud-firestore-parent</artifactId>
-        <version>3.31.9-SNAPSHOT</version><!-- {x-version-update:google-cloud-firestore:current} -->
+        <version>3.31.9</version><!-- {x-version-update:google-cloud-firestore:current} -->
     </parent>
     <dependencies>
         <dependency>
diff --git a/proto-google-cloud-firestore-v1/pom.xml b/proto-google-cloud-firestore-v1/pom.xml
index 3e395633d..2c0616b64 100644
--- a/proto-google-cloud-firestore-v1/pom.xml
+++ b/proto-google-cloud-firestore-v1/pom.xml
@@ -4,13 +4,13 @@
     <modelVersion>4.0.0</modelVersion>
     <groupId>com.google.api.grpc</groupId>
     <artifactId>proto-google-cloud-firestore-v1</artifactId>
-    <version>3.31.9-SNAPSHOT</version><!-- {x-version-update:proto-google-cloud-firestore-v1:current} -->
+    <version>3.31.9</version><!-- {x-version-update:proto-google-cloud-firestore-v1:current} -->
     <name>proto-google-cloud-firestore-v1</name>
     <description>PROTO library for proto-google-cloud-firestore-v1</description>
     <parent>
         <groupId>com.google.cloud</groupId>
         <artifactId>google-cloud-firestore-parent</artifactId>
-        <version>3.31.9-SNAPSHOT</version><!-- {x-version-update:google-cloud-firestore:current} -->
+        <version>3.31.9</version><!-- {x-version-update:google-cloud-firestore:current} -->
     </parent>
     <dependencies>
         <dependency>
diff --git a/versions.txt b/versions.txt
index bc3b2915c..7004033c2 100644
--- a/versions.txt
+++ b/versions.txt
@@ -1,11 +1,11 @@
 # Format:
 # module:released-version:current-version
 
-google-cloud-firestore:3.31.8:3.31.9-SNAPSHOT
-google-cloud-firestore-admin:3.31.8:3.31.9-SNAPSHOT
-google-cloud-firestore-bom:3.31.8:3.31.9-SNAPSHOT
-grpc-google-cloud-firestore-admin-v1:3.31.8:3.31.9-SNAPSHOT
-grpc-google-cloud-firestore-v1:3.31.8:3.31.9-SNAPSHOT
-proto-google-cloud-firestore-admin-v1:3.31.8:3.31.9-SNAPSHOT
-proto-google-cloud-firestore-v1:3.31.8:3.31.9-SNAPSHOT
-proto-google-cloud-firestore-bundle-v1:3.31.8:3.31.9-SNAPSHOT
+google-cloud-firestore:3.31.9:3.31.9
+google-cloud-firestore-admin:3.31.9:3.31.9
+google-cloud-firestore-bom:3.31.9:3.31.9
+grpc-google-cloud-firestore-admin-v1:3.31.9:3.31.9
+grpc-google-cloud-firestore-v1:3.31.9:3.31.9
+proto-google-cloud-firestore-admin-v1:3.31.9:3.31.9
+proto-google-cloud-firestore-v1:3.31.9:3.31.9
+proto-google-cloud-firestore-bundle-v1:3.31.9:3.31.9