diff --git a/README.md b/README.md
index 6fe067b7342..c951c4b9620 100644
--- a/README.md
+++ b/README.md
@@ -18,7 +18,7 @@ The Swagger Specification has undergone 3 revisions since initial creation in 20
 
 Swagger Codegen Version | Release Date | Swagger Spec compatibility | Notes
 ----------------------- | ------------ | -------------------------- | -----
-1.5.0-M2                | 2015-04-06   | 1.0, 1.1, 1.2, 2.0   | [master](https://github.com/swagger-api/swagger-codegen)
+2.1.0-M2                | 2015-04-06   | 1.0, 1.1, 1.2, 2.0   | [master](https://github.com/swagger-api/swagger-codegen)
 2.0.17                  | 2014-08-22   | 1.1, 1.2      | [tag v2.0.17](https://github.com/swagger-api/swagger-codegen/tree/v2.0.17)
 1.0.4                   | 2012-04-12   | 1.0, 1.1      | [tag v1.0.4](https://github.com/swagger-api/swagger-codegen/tree/swagger-codegen_2.9.1-1.1)
 
diff --git a/modules/swagger-codegen-cli/pom.xml b/modules/swagger-codegen-cli/pom.xml
index caf6d3d54a3..d5c54882f5d 100644
--- a/modules/swagger-codegen-cli/pom.xml
+++ b/modules/swagger-codegen-cli/pom.xml
@@ -3,7 +3,7 @@
     <parent>
         <groupId>com.wordnik</groupId>
         <artifactId>swagger-codegen-project</artifactId>
-        <version>1.5.0-M2</version>
+        <version>2.1.0-M2</version>
         <relativePath>../..</relativePath>
     </parent>
     <modelVersion>4.0.0</modelVersion>
diff --git a/modules/swagger-codegen/pom.xml b/modules/swagger-codegen/pom.xml
index 54c8cf9f6cb..e4b70a492b8 100644
--- a/modules/swagger-codegen/pom.xml
+++ b/modules/swagger-codegen/pom.xml
@@ -2,7 +2,7 @@
   <parent>
     <groupId>com.wordnik</groupId>
     <artifactId>swagger-codegen-project</artifactId>
-    <version>1.5.0-M2</version>
+    <version>2.1.0-M2</version>
     <relativePath>../..</relativePath>
   </parent>
   <modelVersion>4.0.0</modelVersion>
@@ -10,7 +10,7 @@
   <artifactId>swagger-codegen</artifactId>
   <packaging>jar</packaging>
   <name>swagger-codegen (core library)</name>
-  <version>1.5.0-M2</version>
+  <version>2.1.0-M2</version>
   <build>
     <sourceDirectory>src/main/java</sourceDirectory>
     <defaultGoal>install</defaultGoal>
diff --git a/modules/swagger-codegen/src/main/resources/JavaJaxRS/pom.mustache b/modules/swagger-codegen/src/main/resources/JavaJaxRS/pom.mustache
index aa7ecf5ab48..607f2116f54 100644
--- a/modules/swagger-codegen/src/main/resources/JavaJaxRS/pom.mustache
+++ b/modules/swagger-codegen/src/main/resources/JavaJaxRS/pom.mustache
@@ -129,7 +129,7 @@
     </repository>
   </repositories>
   <properties>
-    <swagger-core-version>1.5.0-M2</swagger-core-version>
+    <swagger-core-version>2.1.0-M2</swagger-core-version>
     <jetty-version>9.2.9.v20150224</jetty-version>
     <jersey-version>1.13</jersey-version>
     <slf4j-version>1.6.3</slf4j-version>
diff --git a/modules/swagger-generator/pom.xml b/modules/swagger-generator/pom.xml
index bf49f2b976f..582e40f59da 100644
--- a/modules/swagger-generator/pom.xml
+++ b/modules/swagger-generator/pom.xml
@@ -3,14 +3,14 @@
   <parent>
     <groupId>com.wordnik</groupId>
     <artifactId>swagger-codegen-project</artifactId>
-    <version>1.5.0-M2</version>
+    <version>2.1.0-M2</version>
     <relativePath>../..</relativePath>
   </parent>
   <groupId>com.wordnik</groupId>
   <artifactId>swagger-generator</artifactId>
   <packaging>war</packaging>
   <name>swagger-generator</name>
-  <version>1.5.0-M2</version>
+  <version>2.1.0-M2</version>
   <build>
     <sourceDirectory>src/main/java</sourceDirectory>
     <plugins>
diff --git a/pom.xml b/pom.xml
index 59bf41ff0d7..1f386e48b76 100644
--- a/pom.xml
+++ b/pom.xml
@@ -9,7 +9,7 @@
   <artifactId>swagger-codegen-project</artifactId>
   <packaging>pom</packaging>
   <name>swagger-codegen-project</name>
-  <version>1.5.0-M2</version>
+  <version>2.1.0-M2</version>
   <url>https://github.com/swagger-api/swagger-codegen</url>
   <scm>
     <connection>scm:git:git@github.com:swagger-api/swagger-codegen.git</connection>
diff --git a/samples/server/petstore/jaxrs/pom.xml b/samples/server/petstore/jaxrs/pom.xml
index 05764d01c0d..d75c6bbfda8 100644
--- a/samples/server/petstore/jaxrs/pom.xml
+++ b/samples/server/petstore/jaxrs/pom.xml
@@ -129,7 +129,7 @@
     </repository>
   </repositories>
   <properties>
-    <swagger-core-version>1.5.0-M2</swagger-core-version>
+    <swagger-core-version>2.1.0-M2</swagger-core-version>
     <jetty-version>9.2.9.v20150224</jetty-version>
     <jersey-version>1.13</jersey-version>
     <slf4j-version>1.6.3</slf4j-version>