diff --git a/pom.xml b/pom.xml
index 3ed288ea..f3023dce 100644
--- a/pom.xml
+++ b/pom.xml
@@ -3,7 +3,7 @@
     <groupId>io.personium</groupId>
     <artifactId>personium-core</artifactId>
     <packaging>war</packaging>
-    <version>1.8.3</version>
+    <version>1.8.4-SNAPSHOT</version>
     <name>personium-core Maven Webapp</name>
     <url>http://maven.apache.org</url>
     <licenses>
diff --git a/src/main/resources/personium-unit-config-default.properties b/src/main/resources/personium-unit-config-default.properties
index ecd20640..f3176c1e 100644
--- a/src/main/resources/personium-unit-config-default.properties
+++ b/src/main/resources/personium-unit-config-default.properties
@@ -25,7 +25,7 @@
 #################################################
 
 # core version
-io.personium.core.version=1.8.3
+io.personium.core.version=1.8.4
 
 # thread pool num.
 io.personium.core.thread.pool.num.io.cell=10