diff --git a/.github/readme/synth.metadata/synth.metadata b/.github/readme/synth.metadata/synth.metadata
index 71f3c74f8..6ea304019 100644
--- a/.github/readme/synth.metadata/synth.metadata
+++ b/.github/readme/synth.metadata/synth.metadata
@@ -4,14 +4,14 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/java-spanner-jdbc.git",
-        "sha": "53b459e334fdbf391d080817f8b782cff3b12d1b"
+        "sha": "bf2cdae2b42d3b3c3bc5bb01deee3a32e66ebd0e"
       }
     },
     {
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "996775eca5fd934edac3c2ae34b80ff0395b1717"
+        "sha": "41e998d5afdc2c2143a23c9b044b9931936f7318"
       }
     }
   ]
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8a4ac6462..b7a9ece56 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,12 @@
 # Changelog
 
+### [1.18.3](https://www.github.com/googleapis/java-spanner-jdbc/compare/v1.18.2...v1.18.3) (2020-12-16)
+
+
+### Dependencies
+
+* update spanner to 3.1.2 ([#306](https://www.github.com/googleapis/java-spanner-jdbc/issues/306)) ([596e8ed](https://www.github.com/googleapis/java-spanner-jdbc/commit/596e8ed01dc8ffc01c37b233f688d163b8693f85))
+
 ### [1.18.2](https://www.github.com/googleapis/java-spanner-jdbc/compare/v1.18.1...v1.18.2) (2020-12-16)
 
 
diff --git a/README.md b/README.md
index c623b61a4..fde4a8872 100644
--- a/README.md
+++ b/README.md
@@ -17,17 +17,17 @@ If you are using Maven, add this to your pom.xml file:
 <dependency>
   <groupId>com.google.cloud</groupId>
   <artifactId>google-cloud-spanner-jdbc</artifactId>
-  <version>1.18.0</version>
+  <version>1.18.2</version>
 </dependency>
 ```
 
 If you are using Gradle, add this to your dependencies
 ```Groovy
-compile 'com.google.cloud:google-cloud-spanner-jdbc:1.18.0'
+compile 'com.google.cloud:google-cloud-spanner-jdbc:1.18.2'
 ```
 If you are using SBT, add this to your dependencies
 ```Scala
-libraryDependencies += "com.google.cloud" % "google-cloud-spanner-jdbc" % "1.18.0"
+libraryDependencies += "com.google.cloud" % "google-cloud-spanner-jdbc" % "1.18.2"
 ```
 
 ## Authentication
diff --git a/pom.xml b/pom.xml
index 0372b2511..0483a60a6 100644
--- a/pom.xml
+++ b/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-spanner-jdbc</artifactId>
-  <version>1.18.2</version><!-- {x-version-update:google-cloud-spanner-jdbc:current} -->
+  <version>1.18.3</version><!-- {x-version-update:google-cloud-spanner-jdbc:current} -->
   <packaging>jar</packaging>
   <name>Google Cloud Spanner JDBC</name>
   <url>https://github.com/googleapis/java-spanner-jdbc</url>
@@ -71,7 +71,7 @@
       <dependency>
         <groupId>com.google.cloud</groupId>
         <artifactId>google-cloud-spanner-bom</artifactId>
-        <version>3.0.5</version>
+        <version>3.1.2</version>
         <type>pom</type>
         <scope>import</scope>
       </dependency>
@@ -105,6 +105,11 @@
       <groupId>com.google.cloud</groupId>
       <artifactId>google-cloud-spanner</artifactId>
     </dependency>
+    <!-- TODO: Remove grpc-alts from here once it has been removed as a runtime dependency from java-spanner -->
+    <dependency>
+      <groupId>io.grpc</groupId>
+      <artifactId>grpc-alts</artifactId>
+    </dependency>
     <dependency>
       <groupId>com.google.protobuf</groupId>
       <artifactId>protobuf-java</artifactId>
@@ -145,10 +150,6 @@
       <groupId>com.google.api.grpc</groupId>
       <artifactId>proto-google-cloud-spanner-v1</artifactId>
     </dependency>
-    <dependency>
-      <groupId>com.google.api.grpc</groupId>
-      <artifactId>proto-google-cloud-spanner-v1</artifactId>
-    </dependency>
     
     <!-- Test dependencies -->
     <dependency>
@@ -295,6 +296,8 @@
           <artifactId>maven-dependency-plugin</artifactId>
           <configuration>
             <ignoredUnusedDeclaredDependencies>
+              <!-- TODO: Remove grpc-alts from ignored list once it has been removed from java-spanner -->
+              <ignoredDependency>io.grpc:grpc-alts</ignoredDependency>
               <ignoredDependency>com.google.api:gax-grpc</ignoredDependency>
               <ignoredDependency>com.google.cloud:google-cloud-core-grpc</ignoredDependency>
               <ignoredDependency>com.google.api.grpc:grpc-google-cloud-spanner-v1</ignoredDependency>
diff --git a/samples/install-without-bom/pom.xml b/samples/install-without-bom/pom.xml
index df43e4037..8dbf1e051 100644
--- a/samples/install-without-bom/pom.xml
+++ b/samples/install-without-bom/pom.xml
@@ -29,7 +29,7 @@
     <dependency>
       <groupId>com.google.cloud</groupId>
       <artifactId>google-cloud-spanner-jdbc</artifactId>
-      <version>1.18.0</version>
+      <version>1.18.2</version>
     </dependency>
     <!-- [END spanner-jdbc_install_without_bom] -->
 
diff --git a/samples/snapshot/pom.xml b/samples/snapshot/pom.xml
index ae10b6537..f3a997305 100644
--- a/samples/snapshot/pom.xml
+++ b/samples/snapshot/pom.xml
@@ -28,7 +28,7 @@
     <dependency>
       <groupId>com.google.cloud</groupId>
       <artifactId>google-cloud-spanner-jdbc</artifactId>
-      <version>1.18.2</version>
+      <version>1.18.3</version>
     </dependency>
     <!-- {x-version-update-end} -->
 
diff --git a/versions.txt b/versions.txt
index 4ce3c8061..b2dabc820 100644
--- a/versions.txt
+++ b/versions.txt
@@ -1,4 +1,4 @@
 # Format:
 # module:released-version:current-version
 
-google-cloud-spanner-jdbc:1.18.2:1.18.2
+google-cloud-spanner-jdbc:1.18.3:1.18.3