diff --git a/README.md b/README.md
index b0fe0d2..f0fd267 100644
--- a/README.md
+++ b/README.md
@@ -8,7 +8,7 @@ This Pinyin Analysis plugin is used to do conversion between Chinese characters
     --------------------------------------------------
     | master                        | 5.x -> master  |
     --------------------------------------------------
-    | 5.4.3                         | 5.4.3          |
+    | 5.5.1                         | 5.5.1          |
     --------------------------------------------------
     | 5.3.3                         | 5.3.3          |
     --------------------------------------------------
diff --git a/pom.xml b/pom.xml
index c91e072..040647a 100644
--- a/pom.xml
+++ b/pom.xml
@@ -12,7 +12,7 @@
     <inceptionYear>2012</inceptionYear>
 
     <properties>
-        <elasticsearch.version>5.5.0</elasticsearch.version>
+        <elasticsearch.version>5.5.1</elasticsearch.version>
         <maven.compiler.target>1.8</maven.compiler.target>
         <elasticsearch.assembly.descriptor>${project.basedir}/src/main/assemblies/plugin.xml</elasticsearch.assembly.descriptor>
         <elasticsearch.plugin.name>analysis-pinyin</elasticsearch.plugin.name>