diff --git a/pom.xml b/pom.xml
index 18f146c84..f27b8360d 100644
--- a/pom.xml
+++ b/pom.xml
@@ -3,7 +3,7 @@
   <modelVersion>4.0.0</modelVersion>
   <groupId>jp.sf.fess</groupId>
   <artifactId>fess</artifactId>
-  <version>9.1.0-SNAPSHOT</version>
+  <version>9.0.1-SNAPSHOT</version>
   <packaging>war</packaging>
   <name>Fess</name>
   <description>Fess is Full tExt Search System.</description>
diff --git a/src/main/java/jp/sf/fess/Constants.java b/src/main/java/jp/sf/fess/Constants.java
index e49246a86..775a32a03 100644
--- a/src/main/java/jp/sf/fess/Constants.java
+++ b/src/main/java/jp/sf/fess/Constants.java
@@ -23,7 +23,7 @@ import org.codelibs.core.CoreLibConstants;
 public class Constants extends CoreLibConstants {
     public static final int MAJOR_VERSION = 9;
 
-    public static final int MINOR_VERSION = 1;
+    public static final int MINOR_VERSION = 0;
 
     public static final String FESS_VERSION = String.valueOf(MAJOR_VERSION)
             + "." + String.valueOf(MINOR_VERSION);