diff --git a/README.md b/README.md
index 3665d2687..92bc092ab 100644
--- a/README.md
+++ b/README.md
@@ -31,27 +31,27 @@ If you are using Maven, add this to your pom.xml file
 <dependency>
   <groupId>com.google.api</groupId>
   <artifactId>gax</artifactId>
-  <version>1.54.0</version>
+  <version>1.55.0</version>
 </dependency>
 <dependency>
   <groupId>com.google.api</groupId>
   <artifactId>gax-grpc</artifactId>
-  <version>1.54.0</version>
+  <version>1.55.0</version>
 </dependency>
 ```
 
 If you are using Gradle, add this to your dependencies
 
 ```Groovy
-compile 'com.google.api:gax:1.54.0',
-  'com.google.api:gax-grpc:1.54.0'
+compile 'com.google.api:gax:1.55.0',
+  'com.google.api:gax-grpc:1.55.0'
 ```
 
 If you are using SBT, add this to your dependencies
 
 ```Scala
-libraryDependencies += "com.google.api" % "gax" % "1.54.0"
-libraryDependencies += "com.google.api" % "gax-grpc" % "1.54.0"
+libraryDependencies += "com.google.api" % "gax" % "1.55.0"
+libraryDependencies += "com.google.api" % "gax-grpc" % "1.55.0"
 ```
 [//]: # ({x-version-update-end})
 
diff --git a/benchmark/build.gradle b/benchmark/build.gradle
index e09341b3b..adb0ec38a 100644
--- a/benchmark/build.gradle
+++ b/benchmark/build.gradle
@@ -1,4 +1,4 @@
-project.version = "0.56.0" // {x-version-update:benchmark:current}
+project.version = "0.57.0" // {x-version-update:benchmark:current}
 
 buildscript {
     repositories {
@@ -23,8 +23,8 @@ dependencies {
     compile project(':gax-grpc')
     compile "io.grpc:grpc-netty:${libraries['version.io_grpc']}"
 
-    compile 'com.google.api.grpc:grpc-google-cloud-bigtable-v2:0.1.28'
-    compile 'com.google.api.grpc:grpc-google-cloud-pubsub-v1:0.1.28'
+    compile 'com.google.api.grpc:grpc-google-cloud-bigtable-v2:1.11.0'
+    compile 'com.google.api.grpc:grpc-google-cloud-pubsub-v1:1.85.1'
 }
 
 // Allow command line to target specific test
diff --git a/build.gradle b/build.gradle
index ad5e12aef..7710a8996 100644
--- a/build.gradle
+++ b/build.gradle
@@ -24,7 +24,7 @@ apply plugin: 'com.github.sherter.google-java-format'
 apply plugin: 'io.codearte.nexus-staging'
 
 // TODO: Populate this from dependencies.properties version property (for proper Gradle-Bazel sync)
-project.version = "1.54.0" // {x-version-update:gax:current}
+project.version = "1.55.0" // {x-version-update:gax:current}
 
 ext {
   // Project names not used for release
diff --git a/dependencies.properties b/dependencies.properties
index a5115176d..e5e8f1d76 100644
--- a/dependencies.properties
+++ b/dependencies.properties
@@ -8,16 +8,16 @@
 
 # Versions of oneself
 # {x-version-update-start:gax:current}
-version.gax=1.54.0
+version.gax=1.55.0
 # {x-version-update-end}
 # {x-version-update-start:gax:current}
-version.gax_grpc=1.54.0
+version.gax_grpc=1.55.0
 # {x-version-update-end}
 # {x-version-update-start:gax:current}
-version.gax_bom=1.54.0
+version.gax_bom=1.55.0
 # {x-version-update-end}
 # {x-version-update-start:gax-httpjson:current}
-version.gax_httpjson=0.71.0
+version.gax_httpjson=0.72.0
 # {x-version-update-end}
 
 # Versions for dependencies which actual artifacts differ between Bazel and Gradle.
@@ -46,7 +46,7 @@ maven.com_google_errorprone_error_prone_annotations=com.google.errorprone:error_
 maven.com_google_j2objc_j2objc_annotations=com.google.j2objc:j2objc-annotations:1.3
 maven.com_google_auto_value_auto_value=com.google.auto.value:auto-value:1.4
 maven.com_google_api_api_common=com.google.api:api-common:1.8.1
-maven.org_threeten_threetenbp=org.threeten:threetenbp:1.4.0
+maven.org_threeten_threetenbp=org.threeten:threetenbp:1.4.1
 maven.com_google_api_grpc_grpc_google_iam_v1=com.google.api.grpc:grpc-google-iam-v1:0.13.0
 maven.com_google_api_grpc_proto_google_iam_v1=com.google.api.grpc:proto-google-iam-v1:0.13.0
 maven.com_google_http_client_google_http_client=com.google.http-client:google-http-client:1.34.2
@@ -57,7 +57,6 @@ maven.org_apache_commons_commons_lang3=org.apache.commons:commons-lang3:3.6
 # Used by grpc stub
 maven.javax_annotation_javax_annotation_api=javax.annotation:javax.annotation-api:1.3.2
 maven.com_google_guava_failureaccess=com.google.guava:failureaccess:1.0.1
-maven.com_google_android_annotations=com.google.android:annotations:4.1.1.4
 maven.io_perfmark_perfmark_api=io.perfmark:perfmark-api:0.17.0
 maven.io_netty_netty_handler=io.netty:netty-handler:4.1.38.Final
 maven.io_netty_netty_common=io.netty:netty-common:4.1.38.Final
diff --git a/gax-bom/build.gradle b/gax-bom/build.gradle
index 5a2edaaa7..cec11eef5 100644
--- a/gax-bom/build.gradle
+++ b/gax-bom/build.gradle
@@ -12,7 +12,7 @@ buildscript {
 
 archivesBaseName = "gax-bom"
 
-project.version = "1.54.0" // {x-version-update:gax-bom:current}
+project.version = "1.55.0" // {x-version-update:gax-bom:current}
 
 ext {
   mavenJavaDir = "$project.buildDir/publications/mavenJava"
diff --git a/gax-bom/pom.xml b/gax-bom/pom.xml
index a8325eabd..c76de4e10 100644
--- a/gax-bom/pom.xml
+++ b/gax-bom/pom.xml
@@ -3,7 +3,7 @@
   <modelVersion>4.0.0</modelVersion>
   <groupId>com.google.api</groupId>
   <artifactId>gax-bom</artifactId>
-  <version>1.54.0</version><!-- {x-version-update:gax-bom:current} -->
+  <version>1.55.0</version><!-- {x-version-update:gax-bom:current} -->
   <packaging>pom</packaging>
   <name>GAX (Google Api eXtensions) for Java</name>
   <description>Google Api eXtensions for Java</description>
@@ -33,34 +33,34 @@
       <dependency>
         <groupId>com.google.api</groupId>
         <artifactId>gax</artifactId>
-        <version>1.54.0</version><!-- {x-version-update:gax:current} -->
+        <version>1.55.0</version><!-- {x-version-update:gax:current} -->
       </dependency>
       <dependency>
         <groupId>com.google.api</groupId>
         <artifactId>gax</artifactId>
-        <version>1.54.0</version><!-- {x-version-update:gax:current} -->
+        <version>1.55.0</version><!-- {x-version-update:gax:current} -->
 	<classifier>testlib</classifier>
       </dependency>
       <dependency>
         <groupId>com.google.api</groupId>
         <artifactId>gax-grpc</artifactId>
-        <version>1.54.0</version><!-- {x-version-update:gax-grpc:current} -->
+        <version>1.55.0</version><!-- {x-version-update:gax-grpc:current} -->
       </dependency>
       <dependency>
         <groupId>com.google.api</groupId>
         <artifactId>gax-grpc</artifactId>
-        <version>1.54.0</version><!-- {x-version-update:gax-grpc:current} -->
+        <version>1.55.0</version><!-- {x-version-update:gax-grpc:current} -->
 	<classifier>testlib</classifier>
       </dependency>
       <dependency>
         <groupId>com.google.api</groupId>
         <artifactId>gax-httpjson</artifactId>
-        <version>0.71.0</version><!-- {x-version-update:gax-httpjson:current} -->
+        <version>0.72.0</version><!-- {x-version-update:gax-httpjson:current} -->
       </dependency>
       <dependency>
         <groupId>com.google.api</groupId>
         <artifactId>gax-httpjson</artifactId>
-        <version>0.71.0</version><!-- {x-version-update:gax-httpjson:current} -->
+        <version>0.72.0</version><!-- {x-version-update:gax-httpjson:current} -->
 	<classifier>testlib</classifier>
       </dependency>
     </dependencies>
diff --git a/gax-grpc/build.gradle b/gax-grpc/build.gradle
index cc42cc432..75c8688b4 100644
--- a/gax-grpc/build.gradle
+++ b/gax-grpc/build.gradle
@@ -1,7 +1,7 @@
 archivesBaseName = "gax-grpc"
 
 // TODO: Populate this from dependencies.properties version property (for proper Gradle-Bazel sync)
-project.version = "1.54.0" // {x-version-update:gax-grpc:current}
+project.version = "1.55.0" // {x-version-update:gax-grpc:current}
 
 dependencies {
   compile project(':gax'),
diff --git a/gax-grpc/src/main/java/com/google/api/gax/grpc/GrpcCallableFactory.java b/gax-grpc/src/main/java/com/google/api/gax/grpc/GrpcCallableFactory.java
index 5b45c9bff..e94842b27 100644
--- a/gax-grpc/src/main/java/com/google/api/gax/grpc/GrpcCallableFactory.java
+++ b/gax-grpc/src/main/java/com/google/api/gax/grpc/GrpcCallableFactory.java
@@ -84,12 +84,8 @@ public static <RequestT, ResponseT> UnaryCallable<RequestT, ResponseT> createBas
       UnaryCallSettings<?, ?> callSettings,
       ClientContext clientContext) {
     UnaryCallable<RequestT, ResponseT> callable =
-        new GrpcDirectCallable<>(grpcCallSettings.getMethodDescriptor());
-    if (grpcCallSettings.getParamsExtractor() != null) {
-      callable =
-          new GrpcUnaryRequestParamCallable<>(callable, grpcCallSettings.getParamsExtractor());
-    }
-    callable = new GrpcExceptionCallable<>(callable, callSettings.getRetryableCodes());
+        GrpcRawCallableFactory.createUnaryCallable(
+            grpcCallSettings, callSettings.getRetryableCodes());
 
     callable = Callables.retrying(callable, callSettings, clientContext);
 
@@ -234,10 +230,8 @@ BidiStreamingCallable<RequestT, ResponseT> createBidiStreamingCallable(
           StreamingCallSettings<RequestT, ResponseT> streamingCallSettings,
           ClientContext clientContext) {
     BidiStreamingCallable<RequestT, ResponseT> callable =
-        new GrpcDirectBidiStreamingCallable<>(grpcCallSettings.getMethodDescriptor());
-
-    callable =
-        new GrpcExceptionBidiStreamingCallable<>(callable, ImmutableSet.<StatusCode.Code>of());
+        GrpcRawCallableFactory.createBidiStreamingCallable(
+            grpcCallSettings, ImmutableSet.<StatusCode.Code>of());
 
     callable =
         new TracedBidiCallable<>(
@@ -290,15 +284,8 @@ ServerStreamingCallable<RequestT, ResponseT> createServerStreamingCallable(
           ServerStreamingCallSettings<RequestT, ResponseT> streamingCallSettings,
           ClientContext clientContext) {
     ServerStreamingCallable<RequestT, ResponseT> callable =
-        new GrpcDirectServerStreamingCallable<>(grpcCallSettings.getMethodDescriptor());
-    if (grpcCallSettings.getParamsExtractor() != null) {
-      callable =
-          new GrpcServerStreamingRequestParamCallable<>(
-              callable, grpcCallSettings.getParamsExtractor());
-    }
-    callable =
-        new GrpcExceptionServerStreamingCallable<>(
-            callable, streamingCallSettings.getRetryableCodes());
+        GrpcRawCallableFactory.createServerStreamingCallable(
+            grpcCallSettings, streamingCallSettings.getRetryableCodes());
 
     if (clientContext.getStreamWatchdog() != null) {
       callable = Callables.watched(callable, streamingCallSettings, clientContext);
@@ -332,10 +319,8 @@ ClientStreamingCallable<RequestT, ResponseT> createClientStreamingCallable(
           StreamingCallSettings<RequestT, ResponseT> streamingCallSettings,
           ClientContext clientContext) {
     ClientStreamingCallable<RequestT, ResponseT> callable =
-        new GrpcDirectClientStreamingCallable<>(grpcCallSettings.getMethodDescriptor());
-
-    callable =
-        new GrpcExceptionClientStreamingCallable<>(callable, ImmutableSet.<StatusCode.Code>of());
+        GrpcRawCallableFactory.createClientStreamingCallable(
+            grpcCallSettings, ImmutableSet.<StatusCode.Code>of());
 
     callable =
         new TracedClientStreamingCallable<>(
diff --git a/gax-grpc/src/main/java/com/google/api/gax/grpc/GrpcRawCallableFactory.java b/gax-grpc/src/main/java/com/google/api/gax/grpc/GrpcRawCallableFactory.java
new file mode 100644
index 000000000..248760cde
--- /dev/null
+++ b/gax-grpc/src/main/java/com/google/api/gax/grpc/GrpcRawCallableFactory.java
@@ -0,0 +1,120 @@
+/*
+ * Copyright 2020 Google LLC
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google LLC nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+package com.google.api.gax.grpc;
+
+import com.google.api.core.BetaApi;
+import com.google.api.core.InternalApi;
+import com.google.api.gax.rpc.BidiStreamingCallable;
+import com.google.api.gax.rpc.ClientStreamingCallable;
+import com.google.api.gax.rpc.ServerStreamingCallable;
+import com.google.api.gax.rpc.StatusCode;
+import com.google.api.gax.rpc.UnaryCallable;
+import java.util.Set;
+
+/** Class with utility methods to create low level grpc-based direct callables. */
+@InternalApi("For internal use by google-cloud-java clients only")
+public class GrpcRawCallableFactory {
+  private GrpcRawCallableFactory() {}
+
+  /**
+   * Create a Unary callable object with minimal grpc-specific functionality.
+   *
+   * @param grpcCallSettings the gRPC call settings
+   * @param retryableCodes the {@link StatusCode.Code} that should be marked as retryable
+   */
+  public static <RequestT, ResponseT> UnaryCallable<RequestT, ResponseT> createUnaryCallable(
+      GrpcCallSettings<RequestT, ResponseT> grpcCallSettings, Set<StatusCode.Code> retryableCodes) {
+    UnaryCallable<RequestT, ResponseT> callable =
+        new GrpcDirectCallable<>(grpcCallSettings.getMethodDescriptor());
+    if (grpcCallSettings.getParamsExtractor() != null) {
+      callable =
+          new GrpcUnaryRequestParamCallable<>(callable, grpcCallSettings.getParamsExtractor());
+    }
+    return new GrpcExceptionCallable<>(callable, retryableCodes);
+  }
+
+  /**
+   * Create a bidirectional streaming callable object with grpc-specific functionality. Designed for
+   * use by generated code.
+   *
+   * @param grpcCallSettings the gRPC call settings
+   * @param retryableCodes the {@link StatusCode.Code} that should be marked as retryable
+   * @return {@link BidiStreamingCallable} callable object.
+   */
+  @BetaApi("The surface for streaming is not stable yet and may change in the future.")
+  public static <RequestT, ResponseT>
+      BidiStreamingCallable<RequestT, ResponseT> createBidiStreamingCallable(
+          GrpcCallSettings<RequestT, ResponseT> grpcCallSettings,
+          Set<StatusCode.Code> retryableCodes) {
+    BidiStreamingCallable<RequestT, ResponseT> callable =
+        new GrpcDirectBidiStreamingCallable<>(grpcCallSettings.getMethodDescriptor());
+
+    return new GrpcExceptionBidiStreamingCallable<>(callable, retryableCodes);
+  }
+
+  /**
+   * Create a server-streaming callable with grpc-specific functionality. Designed for use by
+   * generated code.
+   *
+   * @param grpcCallSettings the gRPC call settings
+   * @param retryableCodes the {@link StatusCode.Code} that should be marked as retryable
+   */
+  @BetaApi("The surface for streaming is not stable yet and may change in the future.")
+  public static <RequestT, ResponseT>
+      ServerStreamingCallable<RequestT, ResponseT> createServerStreamingCallable(
+          GrpcCallSettings<RequestT, ResponseT> grpcCallSettings,
+          Set<StatusCode.Code> retryableCodes) {
+    ServerStreamingCallable<RequestT, ResponseT> callable =
+        new GrpcDirectServerStreamingCallable<>(grpcCallSettings.getMethodDescriptor());
+    if (grpcCallSettings.getParamsExtractor() != null) {
+      callable =
+          new GrpcServerStreamingRequestParamCallable<>(
+              callable, grpcCallSettings.getParamsExtractor());
+    }
+    return new GrpcExceptionServerStreamingCallable<>(callable, retryableCodes);
+  }
+  /**
+   * Create a client-streaming callable object with grpc-specific functionality. Designed for use by
+   * generated code.
+   *
+   * @param grpcCallSettings the gRPC call settings
+   * @param retryableCodes the {@link StatusCode.Code} that should be marked as retryable
+   */
+  @BetaApi("The surface for streaming is not stable yet and may change in the future.")
+  public static <RequestT, ResponseT>
+      ClientStreamingCallable<RequestT, ResponseT> createClientStreamingCallable(
+          GrpcCallSettings<RequestT, ResponseT> grpcCallSettings,
+          Set<StatusCode.Code> retryableCodes) {
+    ClientStreamingCallable<RequestT, ResponseT> callable =
+        new GrpcDirectClientStreamingCallable<>(grpcCallSettings.getMethodDescriptor());
+
+    return new GrpcExceptionClientStreamingCallable<>(callable, retryableCodes);
+  }
+}
diff --git a/gax-httpjson/build.gradle b/gax-httpjson/build.gradle
index 2bd954c27..2386a1626 100644
--- a/gax-httpjson/build.gradle
+++ b/gax-httpjson/build.gradle
@@ -1,7 +1,7 @@
 archivesBaseName = "gax-httpjson"
 
 // TODO: Populate this from dependencies.properties version property (for proper Gradle-Bazel sync)
-project.version = "0.71.0" // {x-version-update:gax-httpjson:current}
+project.version = "0.72.0" // {x-version-update:gax-httpjson:current}
 
 dependencies {
   compile project(':gax'),
diff --git a/gax/build.gradle b/gax/build.gradle
index 8f531b250..a89332c35 100644
--- a/gax/build.gradle
+++ b/gax/build.gradle
@@ -1,7 +1,7 @@
 archivesBaseName = "gax"
 
 // TODO: Populate this from dependencies.properties version property (for proper Gradle-Bazel sync)
-project.version = "1.54.0" // {x-version-update:gax:current}
+project.version = "1.55.0" // {x-version-update:gax:current}
 
 dependencies {
   compile libraries['maven.com_google_guava_guava'],
diff --git a/samples/pom.xml b/samples/pom.xml
index 06925b6cd..714afb3cf 100644
--- a/samples/pom.xml
+++ b/samples/pom.xml
@@ -14,13 +14,13 @@
       <groupId>com.google.api</groupId>
       <artifactId>gax</artifactId>
       <!-- WARNING this is automatically populated by a build script, don't update manually -->
-      <version>1.54.0</version><!-- {x-version-update:gax:current} -->
+      <version>1.55.0</version><!-- {x-version-update:gax:current} -->
     </dependency>
     <dependency>
       <groupId>com.google.api</groupId>
       <artifactId>gax-grpc</artifactId>
       <!-- WARNING this is automatically populated by a build script, don't update manually -->
-      <version>1.54.0</version><!-- {x-version-update:gax-grpc:current} -->
+      <version>1.55.0</version><!-- {x-version-update:gax-grpc:current} -->
     </dependency>
     <dependency>
       <groupId>com.google.auto.value</groupId>
diff --git a/versions.txt b/versions.txt
index b4b62dfb9..0488823e1 100644
--- a/versions.txt
+++ b/versions.txt
@@ -1,8 +1,8 @@
 # Format:
 # module:released-version:current-version
 
-gax:1.54.0:1.54.0
-gax-bom:1.54.0:1.54.0
-gax-grpc:1.54.0:1.54.0
-gax-httpjson:0.71.0:0.71.0
-benchmark:0.56.0:0.56.0
+gax:1.55.0:1.55.0
+gax-bom:1.55.0:1.55.0
+gax-grpc:1.55.0:1.55.0
+gax-httpjson:0.72.0:0.72.0
+benchmark:0.57.0:0.57.0