diff --git a/CHANGELOG.md b/CHANGELOG.md
index 469f4e82..d99fda8a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,17 @@
 # Changelog
 
+## [2.6.0](https://github.com/googleapis/java-document-ai/compare/v2.5.2...v2.6.0) (2022-06-30)
+
+
+### Features
+
+* Enable REST transport for most of Java and Go clients ([#840](https://github.com/googleapis/java-document-ai/issues/840)) ([59f99a7](https://github.com/googleapis/java-document-ai/commit/59f99a7d47adc63811367dd1225cbbd3139bb430))
+
+
+### Bug Fixes
+
+* update gapic-generator-java with mock service generation fixes ([#846](https://github.com/googleapis/java-document-ai/issues/846)) ([7476317](https://github.com/googleapis/java-document-ai/commit/74763178e522484bc29aa1d82450de18dc56613c))
+
 ## [2.5.2](https://github.com/googleapis/java-document-ai/compare/v2.5.1...v2.5.2) (2022-06-23)
 
 
diff --git a/google-cloud-document-ai-bom/pom.xml b/google-cloud-document-ai-bom/pom.xml
index c1e7119f..df379a6a 100644
--- a/google-cloud-document-ai-bom/pom.xml
+++ b/google-cloud-document-ai-bom/pom.xml
@@ -3,7 +3,7 @@
   <modelVersion>4.0.0</modelVersion>
   <groupId>com.google.cloud</groupId>
   <artifactId>google-cloud-document-ai-bom</artifactId>
-  <version>2.5.3-SNAPSHOT</version> <!-- {x-version-update:google-cloud-document-ai:current} -->
+  <version>2.6.0</version> <!-- {x-version-update:google-cloud-document-ai:current} -->
   <packaging>pom</packaging>
   <parent>
     <groupId>com.google.cloud</groupId>
@@ -50,47 +50,47 @@
       <dependency>
         <groupId>com.google.cloud</groupId>
         <artifactId>google-cloud-document-ai</artifactId>
-        <version>2.5.3-SNAPSHOT</version><!-- {x-version-update:google-cloud-document-ai:current} -->
+        <version>2.6.0</version><!-- {x-version-update:google-cloud-document-ai:current} -->
       </dependency>
       <dependency>
         <groupId>com.google.api.grpc</groupId>
         <artifactId>grpc-google-cloud-document-ai-v1beta1</artifactId>
-        <version>0.17.3-SNAPSHOT</version><!-- {x-version-update:grpc-google-cloud-document-ai-v1beta1:current} -->
+        <version>0.18.0</version><!-- {x-version-update:grpc-google-cloud-document-ai-v1beta1:current} -->
       </dependency>
       <dependency>
         <groupId>com.google.api.grpc</groupId>
         <artifactId>grpc-google-cloud-document-ai-v1beta2</artifactId>
-        <version>0.17.3-SNAPSHOT</version><!-- {x-version-update:grpc-google-cloud-document-ai-v1beta2:current} -->
+        <version>0.18.0</version><!-- {x-version-update:grpc-google-cloud-document-ai-v1beta2:current} -->
       </dependency>
       <dependency>
         <groupId>com.google.api.grpc</groupId>
         <artifactId>grpc-google-cloud-document-ai-v1beta3</artifactId>
-        <version>0.17.3-SNAPSHOT</version><!-- {x-version-update:grpc-google-cloud-document-ai-v1beta3:current} -->
+        <version>0.18.0</version><!-- {x-version-update:grpc-google-cloud-document-ai-v1beta3:current} -->
       </dependency>
       <dependency>
         <groupId>com.google.api.grpc</groupId>
         <artifactId>grpc-google-cloud-document-ai-v1</artifactId>
-        <version>2.5.3-SNAPSHOT</version><!-- {x-version-update:grpc-google-cloud-document-ai-v1:current} -->
+        <version>2.6.0</version><!-- {x-version-update:grpc-google-cloud-document-ai-v1:current} -->
       </dependency>
       <dependency>
         <groupId>com.google.api.grpc</groupId>
         <artifactId>proto-google-cloud-document-ai-v1beta1</artifactId>
-        <version>0.17.3-SNAPSHOT</version><!-- {x-version-update:proto-google-cloud-document-ai-v1beta1:current} -->
+        <version>0.18.0</version><!-- {x-version-update:proto-google-cloud-document-ai-v1beta1:current} -->
       </dependency>
       <dependency>
         <groupId>com.google.api.grpc</groupId>
         <artifactId>proto-google-cloud-document-ai-v1beta2</artifactId>
-        <version>0.17.3-SNAPSHOT</version><!-- {x-version-update:proto-google-cloud-document-ai-v1beta2:current} -->
+        <version>0.18.0</version><!-- {x-version-update:proto-google-cloud-document-ai-v1beta2:current} -->
       </dependency>
       <dependency>
         <groupId>com.google.api.grpc</groupId>
         <artifactId>proto-google-cloud-document-ai-v1beta3</artifactId>
-        <version>0.17.3-SNAPSHOT</version><!-- {x-version-update:proto-google-cloud-document-ai-v1beta3:current} -->
+        <version>0.18.0</version><!-- {x-version-update:proto-google-cloud-document-ai-v1beta3:current} -->
       </dependency>
       <dependency>
         <groupId>com.google.api.grpc</groupId>
         <artifactId>proto-google-cloud-document-ai-v1</artifactId>
-        <version>2.5.3-SNAPSHOT</version><!-- {x-version-update:proto-google-cloud-document-ai-v1:current} -->
+        <version>2.6.0</version><!-- {x-version-update:proto-google-cloud-document-ai-v1:current} -->
       </dependency>
     </dependencies>
   </dependencyManagement>
diff --git a/google-cloud-document-ai/pom.xml b/google-cloud-document-ai/pom.xml
index f1337f8f..489b0b74 100644
--- a/google-cloud-document-ai/pom.xml
+++ b/google-cloud-document-ai/pom.xml
@@ -3,7 +3,7 @@
   <modelVersion>4.0.0</modelVersion>
   <groupId>com.google.cloud</groupId>
   <artifactId>google-cloud-document-ai</artifactId>
-  <version>2.5.3-SNAPSHOT</version> <!-- {x-version-update:google-cloud-document-ai:current} -->
+  <version>2.6.0</version> <!-- {x-version-update:google-cloud-document-ai:current} -->
   <packaging>jar</packaging>
   <name>Google Cloud Document AI</name>
   <url>https://github.com/googleapis/java-document-ai</url>
@@ -11,7 +11,7 @@
   <parent>
     <groupId>com.google.cloud</groupId>
     <artifactId>google-cloud-document-ai-parent</artifactId>
-    <version>2.5.3-SNAPSHOT</version> <!-- {x-version-update:google-cloud-document-ai:current} -->
+    <version>2.6.0</version> <!-- {x-version-update:google-cloud-document-ai:current} -->
   </parent>
   <properties>
     <site.installationModule>google-cloud-document-ai</site.installationModule>
diff --git a/grpc-google-cloud-document-ai-v1/pom.xml b/grpc-google-cloud-document-ai-v1/pom.xml
index 87cbd273..88685fc6 100644
--- a/grpc-google-cloud-document-ai-v1/pom.xml
+++ b/grpc-google-cloud-document-ai-v1/pom.xml
@@ -4,13 +4,13 @@
   <modelVersion>4.0.0</modelVersion>
   <groupId>com.google.api.grpc</groupId>
   <artifactId>grpc-google-cloud-document-ai-v1</artifactId>
-  <version>2.5.3-SNAPSHOT</version><!-- {x-version-update:grpc-google-cloud-document-ai-v1:current} -->
+  <version>2.6.0</version><!-- {x-version-update:grpc-google-cloud-document-ai-v1:current} -->
   <name>grpc-google-cloud-document-ai-v1</name>
   <description>GRPC library for google-cloud-document-ai</description>
   <parent>
     <groupId>com.google.cloud</groupId>
     <artifactId>google-cloud-document-ai-parent</artifactId>
-    <version>2.5.3-SNAPSHOT</version><!-- {x-version-update:google-cloud-document-ai:current} -->
+    <version>2.6.0</version><!-- {x-version-update:google-cloud-document-ai:current} -->
   </parent>
   <dependencies>
     <dependency>
diff --git a/grpc-google-cloud-document-ai-v1beta1/pom.xml b/grpc-google-cloud-document-ai-v1beta1/pom.xml
index 9b1d4766..6210af00 100644
--- a/grpc-google-cloud-document-ai-v1beta1/pom.xml
+++ b/grpc-google-cloud-document-ai-v1beta1/pom.xml
@@ -3,13 +3,13 @@
   <modelVersion>4.0.0</modelVersion>
   <groupId>com.google.api.grpc</groupId>
   <artifactId>grpc-google-cloud-document-ai-v1beta1</artifactId>
-  <version>0.17.3-SNAPSHOT</version> <!-- {x-version-update:grpc-google-cloud-document-ai-v1beta1:current} -->
+  <version>0.18.0</version> <!-- {x-version-update:grpc-google-cloud-document-ai-v1beta1:current} -->
   <name>grpc-google-cloud-document-ai-v1beta1</name>
   <description>GRPC library for grpc-google-cloud-document-ai-v1beta1</description>
   <parent>
     <groupId>com.google.cloud</groupId>
     <artifactId>google-cloud-document-ai-parent</artifactId>
-    <version>2.5.3-SNAPSHOT</version> <!-- {x-version-update:google-cloud-document-ai:current} -->
+    <version>2.6.0</version> <!-- {x-version-update:google-cloud-document-ai:current} -->
   </parent>
   <dependencies>
     <dependency>
diff --git a/grpc-google-cloud-document-ai-v1beta2/pom.xml b/grpc-google-cloud-document-ai-v1beta2/pom.xml
index faabe869..0e45dd6a 100644
--- a/grpc-google-cloud-document-ai-v1beta2/pom.xml
+++ b/grpc-google-cloud-document-ai-v1beta2/pom.xml
@@ -3,13 +3,13 @@
   <modelVersion>4.0.0</modelVersion>
   <groupId>com.google.api.grpc</groupId>
   <artifactId>grpc-google-cloud-document-ai-v1beta2</artifactId>
-  <version>0.17.3-SNAPSHOT</version> <!-- {x-version-update:grpc-google-cloud-document-ai-v1beta2:current} -->
+  <version>0.18.0</version> <!-- {x-version-update:grpc-google-cloud-document-ai-v1beta2:current} -->
   <name>grpc-google-cloud-document-ai-v1beta2</name>
   <description>GRPC library for grpc-google-cloud-document-ai-v1beta2</description>
   <parent>
     <groupId>com.google.cloud</groupId>
     <artifactId>google-cloud-document-ai-parent</artifactId>
-    <version>2.5.3-SNAPSHOT</version> <!-- {x-version-update:google-cloud-document-ai:current} -->
+    <version>2.6.0</version> <!-- {x-version-update:google-cloud-document-ai:current} -->
   </parent>
   <dependencies>
     <dependency>
diff --git a/grpc-google-cloud-document-ai-v1beta3/pom.xml b/grpc-google-cloud-document-ai-v1beta3/pom.xml
index 426d5417..43066550 100644
--- a/grpc-google-cloud-document-ai-v1beta3/pom.xml
+++ b/grpc-google-cloud-document-ai-v1beta3/pom.xml
@@ -3,13 +3,13 @@
   <modelVersion>4.0.0</modelVersion>
   <groupId>com.google.api.grpc</groupId>
   <artifactId>grpc-google-cloud-document-ai-v1beta3</artifactId>
-  <version>0.17.3-SNAPSHOT</version> <!-- {x-version-update:grpc-google-cloud-document-ai-v1beta3:current} -->
+  <version>0.18.0</version> <!-- {x-version-update:grpc-google-cloud-document-ai-v1beta3:current} -->
   <name>grpc-google-cloud-document-ai-v1beta3</name>
   <description>GRPC library for grpc-google-cloud-document-ai-v1beta3</description>
   <parent>
     <groupId>com.google.cloud</groupId>
     <artifactId>google-cloud-document-ai-parent</artifactId>
-    <version>2.5.3-SNAPSHOT</version> <!-- {x-version-update:google-cloud-document-ai:current} -->
+    <version>2.6.0</version> <!-- {x-version-update:google-cloud-document-ai:current} -->
   </parent>
   <dependencies>
     <dependency>
diff --git a/pom.xml b/pom.xml
index 19dc2be5..09e718b0 100644
--- a/pom.xml
+++ b/pom.xml
@@ -4,7 +4,7 @@
   <groupId>com.google.cloud</groupId>
   <artifactId>google-cloud-document-ai-parent</artifactId>
   <packaging>pom</packaging>
-  <version>2.5.3-SNAPSHOT</version> <!-- {x-version-update:google-cloud-document-ai:current} -->
+  <version>2.6.0</version> <!-- {x-version-update:google-cloud-document-ai:current} -->
   <name>Google Cloud Document AI Parent</name>
   <url>https://github.com/googleapis/java-document-ai</url>
   <description>
@@ -61,47 +61,47 @@
       <dependency>
         <groupId>com.google.api.grpc</groupId>
         <artifactId>grpc-google-cloud-document-ai-v1beta1</artifactId>
-        <version>0.17.3-SNAPSHOT</version> <!-- {x-version-update:grpc-google-cloud-document-ai-v1beta1:current} -->
+        <version>0.18.0</version> <!-- {x-version-update:grpc-google-cloud-document-ai-v1beta1:current} -->
       </dependency>
       <dependency>
         <groupId>com.google.api.grpc</groupId>
         <artifactId>proto-google-cloud-document-ai-v1</artifactId>
-        <version>2.5.3-SNAPSHOT</version><!-- {x-version-update:proto-google-cloud-document-ai-v1:current} -->
+        <version>2.6.0</version><!-- {x-version-update:proto-google-cloud-document-ai-v1:current} -->
       </dependency>
       <dependency>
         <groupId>com.google.api.grpc</groupId>
         <artifactId>grpc-google-cloud-document-ai-v1</artifactId>
-        <version>2.5.3-SNAPSHOT</version><!-- {x-version-update:grpc-google-cloud-document-ai-v1:current} -->
+        <version>2.6.0</version><!-- {x-version-update:grpc-google-cloud-document-ai-v1:current} -->
       </dependency>
       <dependency>
         <groupId>com.google.cloud</groupId>
         <artifactId>google-cloud-document-ai</artifactId>
-        <version>2.5.3-SNAPSHOT</version><!-- {x-version-update:google-cloud-document-ai:current} -->
+        <version>2.6.0</version><!-- {x-version-update:google-cloud-document-ai:current} -->
       </dependency>
       <dependency>
         <groupId>com.google.api.grpc</groupId>
         <artifactId>grpc-google-cloud-document-ai-v1beta2</artifactId>
-        <version>0.17.3-SNAPSHOT</version> <!-- {x-version-update:grpc-google-cloud-document-ai-v1beta2:current} -->
+        <version>0.18.0</version> <!-- {x-version-update:grpc-google-cloud-document-ai-v1beta2:current} -->
       </dependency>
       <dependency>
         <groupId>com.google.api.grpc</groupId>
         <artifactId>grpc-google-cloud-document-ai-v1beta3</artifactId>
-        <version>0.17.3-SNAPSHOT</version> <!-- {x-version-update:grpc-google-cloud-document-ai-v1beta3:current} -->
+        <version>0.18.0</version> <!-- {x-version-update:grpc-google-cloud-document-ai-v1beta3:current} -->
       </dependency>
       <dependency>
         <groupId>com.google.api.grpc</groupId>
         <artifactId>proto-google-cloud-document-ai-v1beta1</artifactId>
-        <version>0.17.3-SNAPSHOT</version> <!-- {x-version-update:proto-google-cloud-document-ai-v1beta1:current} -->
+        <version>0.18.0</version> <!-- {x-version-update:proto-google-cloud-document-ai-v1beta1:current} -->
       </dependency>
       <dependency>
         <groupId>com.google.api.grpc</groupId>
         <artifactId>proto-google-cloud-document-ai-v1beta2</artifactId>
-        <version>0.17.3-SNAPSHOT</version> <!-- {x-version-update:proto-google-cloud-document-ai-v1beta2:current} -->
+        <version>0.18.0</version> <!-- {x-version-update:proto-google-cloud-document-ai-v1beta2:current} -->
       </dependency>
       <dependency>
         <groupId>com.google.api.grpc</groupId>
         <artifactId>proto-google-cloud-document-ai-v1beta3</artifactId>
-        <version>0.17.3-SNAPSHOT</version> <!-- {x-version-update:proto-google-cloud-document-ai-v1beta3:current} -->
+        <version>0.18.0</version> <!-- {x-version-update:proto-google-cloud-document-ai-v1beta3:current} -->
       </dependency>
 
       <dependency>
diff --git a/proto-google-cloud-document-ai-v1/pom.xml b/proto-google-cloud-document-ai-v1/pom.xml
index fb6e9f49..13940e68 100644
--- a/proto-google-cloud-document-ai-v1/pom.xml
+++ b/proto-google-cloud-document-ai-v1/pom.xml
@@ -4,13 +4,13 @@
   <modelVersion>4.0.0</modelVersion>
   <groupId>com.google.api.grpc</groupId>
   <artifactId>proto-google-cloud-document-ai-v1</artifactId>
-  <version>2.5.3-SNAPSHOT</version><!-- {x-version-update:proto-google-cloud-document-ai-v1:current} -->
+  <version>2.6.0</version><!-- {x-version-update:proto-google-cloud-document-ai-v1:current} -->
   <name>proto-google-cloud-document-ai-v1</name>
   <description>Proto library for google-cloud-document-ai</description>
   <parent>
     <groupId>com.google.cloud</groupId>
     <artifactId>google-cloud-document-ai-parent</artifactId>
-    <version>2.5.3-SNAPSHOT</version><!-- {x-version-update:google-cloud-document-ai:current} -->
+    <version>2.6.0</version><!-- {x-version-update:google-cloud-document-ai:current} -->
   </parent>
   <dependencies>
     <dependency>
diff --git a/proto-google-cloud-document-ai-v1beta1/pom.xml b/proto-google-cloud-document-ai-v1beta1/pom.xml
index 8e331de9..8e557c42 100644
--- a/proto-google-cloud-document-ai-v1beta1/pom.xml
+++ b/proto-google-cloud-document-ai-v1beta1/pom.xml
@@ -3,13 +3,13 @@
   <modelVersion>4.0.0</modelVersion>
   <groupId>com.google.api.grpc</groupId>
   <artifactId>proto-google-cloud-document-ai-v1beta1</artifactId>
-  <version>0.17.3-SNAPSHOT</version> <!-- {x-version-update:proto-google-cloud-document-ai-v1beta1:current} -->
+  <version>0.18.0</version> <!-- {x-version-update:proto-google-cloud-document-ai-v1beta1:current} -->
   <name>proto-google-cloud-document-ai-v1beta1</name>
   <description>PROTO library for proto-google-cloud-document-ai-v1beta1</description>
   <parent>
     <groupId>com.google.cloud</groupId>
     <artifactId>google-cloud-document-ai-parent</artifactId>
-    <version>2.5.3-SNAPSHOT</version> <!-- {x-version-update:google-cloud-document-ai:current} -->
+    <version>2.6.0</version> <!-- {x-version-update:google-cloud-document-ai:current} -->
   </parent>
   <dependencies>
     <dependency>
diff --git a/proto-google-cloud-document-ai-v1beta2/pom.xml b/proto-google-cloud-document-ai-v1beta2/pom.xml
index d6be55e4..17af4cbc 100644
--- a/proto-google-cloud-document-ai-v1beta2/pom.xml
+++ b/proto-google-cloud-document-ai-v1beta2/pom.xml
@@ -3,13 +3,13 @@
   <modelVersion>4.0.0</modelVersion>
   <groupId>com.google.api.grpc</groupId>
   <artifactId>proto-google-cloud-document-ai-v1beta2</artifactId>
-  <version>0.17.3-SNAPSHOT</version> <!-- {x-version-update:proto-google-cloud-document-ai-v1beta2:current} -->
+  <version>0.18.0</version> <!-- {x-version-update:proto-google-cloud-document-ai-v1beta2:current} -->
   <name>proto-google-cloud-document-ai-v1beta2</name>
   <description>PROTO library for proto-google-cloud-document-ai-v1beta2</description>
   <parent>
     <groupId>com.google.cloud</groupId>
     <artifactId>google-cloud-document-ai-parent</artifactId>
-    <version>2.5.3-SNAPSHOT</version> <!-- {x-version-update:google-cloud-document-ai:current} -->
+    <version>2.6.0</version> <!-- {x-version-update:google-cloud-document-ai:current} -->
   </parent>
   <dependencies>
     <dependency>
diff --git a/proto-google-cloud-document-ai-v1beta3/pom.xml b/proto-google-cloud-document-ai-v1beta3/pom.xml
index b712b035..74422a1b 100644
--- a/proto-google-cloud-document-ai-v1beta3/pom.xml
+++ b/proto-google-cloud-document-ai-v1beta3/pom.xml
@@ -3,13 +3,13 @@
   <modelVersion>4.0.0</modelVersion>
   <groupId>com.google.api.grpc</groupId>
   <artifactId>proto-google-cloud-document-ai-v1beta3</artifactId>
-  <version>0.17.3-SNAPSHOT</version> <!-- {x-version-update:proto-google-cloud-document-ai-v1beta3:current} -->
+  <version>0.18.0</version> <!-- {x-version-update:proto-google-cloud-document-ai-v1beta3:current} -->
   <name>proto-google-cloud-document-ai-v1beta3</name>
   <description>PROTO library for proto-google-cloud-document-ai-v1beta3</description>
   <parent>
     <groupId>com.google.cloud</groupId>
     <artifactId>google-cloud-document-ai-parent</artifactId>
-    <version>2.5.3-SNAPSHOT</version> <!-- {x-version-update:google-cloud-document-ai:current} -->
+    <version>2.6.0</version> <!-- {x-version-update:google-cloud-document-ai:current} -->
   </parent>
   <dependencies>
     <dependency>
diff --git a/versions.txt b/versions.txt
index 1d8fef76..cae1eb8e 100644
--- a/versions.txt
+++ b/versions.txt
@@ -1,12 +1,12 @@
 # Format:
 # module:released-version:current-version
 
-google-cloud-document-ai:2.5.2:2.5.3-SNAPSHOT
-grpc-google-cloud-document-ai-v1beta1:0.17.2:0.17.3-SNAPSHOT
-grpc-google-cloud-document-ai-v1beta2:0.17.2:0.17.3-SNAPSHOT
-grpc-google-cloud-document-ai-v1beta3:0.17.2:0.17.3-SNAPSHOT
-grpc-google-cloud-document-ai-v1:2.5.2:2.5.3-SNAPSHOT
-proto-google-cloud-document-ai-v1beta1:0.17.2:0.17.3-SNAPSHOT
-proto-google-cloud-document-ai-v1beta2:0.17.2:0.17.3-SNAPSHOT
-proto-google-cloud-document-ai-v1beta3:0.17.2:0.17.3-SNAPSHOT
-proto-google-cloud-document-ai-v1:2.5.2:2.5.3-SNAPSHOT
+google-cloud-document-ai:2.6.0:2.6.0
+grpc-google-cloud-document-ai-v1beta1:0.18.0:0.18.0
+grpc-google-cloud-document-ai-v1beta2:0.18.0:0.18.0
+grpc-google-cloud-document-ai-v1beta3:0.18.0:0.18.0
+grpc-google-cloud-document-ai-v1:2.6.0:2.6.0
+proto-google-cloud-document-ai-v1beta1:0.18.0:0.18.0
+proto-google-cloud-document-ai-v1beta2:0.18.0:0.18.0
+proto-google-cloud-document-ai-v1beta3:0.18.0:0.18.0
+proto-google-cloud-document-ai-v1:2.6.0:2.6.0