diff --git a/pom.xml b/pom.xml
index 9dcadc2..5066626 100644
--- a/pom.xml
+++ b/pom.xml
@@ -3,7 +3,7 @@
 
     <groupId>hk.ust.bioinformatics</groupId>
     <artifactId>ECL2</artifactId>
-    <version>2.1.8</version>
+    <version>2.1.9</version>
     <packaging>jar</packaging>
 
     <name>ECL2</name>
diff --git a/src/main/java/proteomics/ECL2.java b/src/main/java/proteomics/ECL2.java
index c9d67fc..5775f66 100644
--- a/src/main/java/proteomics/ECL2.java
+++ b/src/main/java/proteomics/ECL2.java
@@ -44,7 +44,7 @@ public class ECL2 {
     public static final int[] isotopeCorrectionArray = new int[]{-2, -1, 0}; // do not change it
 
     private static final Logger logger = LoggerFactory.getLogger(ECL2.class);
-    public static final String version = "2.1.8";
+    public static final String version = "2.1.9";
 
     public static boolean debug;
     public static boolean dev;
diff --git a/src/main/resources/parameter.def b/src/main/resources/parameter.def
index aae7cd6..b4d1dc2 100644
--- a/src/main/resources/parameter.def
+++ b/src/main/resources/parameter.def
@@ -1,4 +1,4 @@
-# 2.1.8
+# 2.1.9
 # The first line is the parameter file version. Do not change it.
 thread_num = 0 # The thread number. Set to 0 to use all the CPU resources of the computer.
 debug = 0 # For debug.