diff --git a/coverage-reports/pom.xml b/coverage-reports/pom.xml
index 769651efdf..b528398e24 100644
--- a/coverage-reports/pom.xml
+++ b/coverage-reports/pom.xml
@@ -22,7 +22,7 @@
     <parent>
         <groupId>io.siddhi</groupId>
         <artifactId>siddhi</artifactId>
-        <version>5.1.1-SNAPSHOT</version>
+        <version>5.1.1</version>
         <relativePath>../pom.xml</relativePath>
     </parent>
 
diff --git a/modules/siddhi-annotations/pom.xml b/modules/siddhi-annotations/pom.xml
index 66b382b6f7..2204c1cf08 100644
--- a/modules/siddhi-annotations/pom.xml
+++ b/modules/siddhi-annotations/pom.xml
@@ -22,7 +22,7 @@
     <parent>
         <groupId>io.siddhi</groupId>
         <artifactId>siddhi</artifactId>
-        <version>5.1.1-SNAPSHOT</version>
+        <version>5.1.1</version>
         <relativePath>../..</relativePath>
     </parent>
 
diff --git a/modules/siddhi-core/pom.xml b/modules/siddhi-core/pom.xml
index 9877caabb4..d3e92c9656 100644
--- a/modules/siddhi-core/pom.xml
+++ b/modules/siddhi-core/pom.xml
@@ -21,7 +21,7 @@
     <parent>
         <artifactId>siddhi</artifactId>
         <groupId>io.siddhi</groupId>
-        <version>5.1.1-SNAPSHOT</version>
+        <version>5.1.1</version>
         <relativePath>../../pom.xml</relativePath>
 
     </parent>
diff --git a/modules/siddhi-core/siddhi-core-doc-gen/pom.xml b/modules/siddhi-core/siddhi-core-doc-gen/pom.xml
index 19cbfef5da..de28124a8d 100644
--- a/modules/siddhi-core/siddhi-core-doc-gen/pom.xml
+++ b/modules/siddhi-core/siddhi-core-doc-gen/pom.xml
@@ -20,7 +20,7 @@
     <parent>
         <artifactId>siddhi</artifactId>
         <groupId>io.siddhi</groupId>
-        <version>5.1.1-SNAPSHOT</version>
+        <version>5.1.1</version>
         <relativePath>../../../pom.xml</relativePath>
     </parent>
     <modelVersion>4.0.0</modelVersion>
diff --git a/modules/siddhi-doc-gen/pom.xml b/modules/siddhi-doc-gen/pom.xml
index 44c4f959fd..46fd1d6a7a 100644
--- a/modules/siddhi-doc-gen/pom.xml
+++ b/modules/siddhi-doc-gen/pom.xml
@@ -20,7 +20,7 @@
     <parent>
         <artifactId>siddhi</artifactId>
         <groupId>io.siddhi</groupId>
-        <version>5.1.1-SNAPSHOT</version>
+        <version>5.1.1</version>
         <relativePath>../../pom.xml</relativePath>
     </parent>
     <modelVersion>4.0.0</modelVersion>
diff --git a/modules/siddhi-feature/pom.xml b/modules/siddhi-feature/pom.xml
index 1c0ae6f5ad..0a18af6d2b 100644
--- a/modules/siddhi-feature/pom.xml
+++ b/modules/siddhi-feature/pom.xml
@@ -22,7 +22,7 @@
     <parent>
         <artifactId>siddhi</artifactId>
         <groupId>io.siddhi</groupId>
-        <version>5.1.1-SNAPSHOT</version>
+        <version>5.1.1</version>
         <relativePath>../../pom.xml</relativePath>
     </parent>
 
diff --git a/modules/siddhi-query-api/pom.xml b/modules/siddhi-query-api/pom.xml
index 8d687538b8..db847ab535 100644
--- a/modules/siddhi-query-api/pom.xml
+++ b/modules/siddhi-query-api/pom.xml
@@ -20,7 +20,7 @@
     <parent>
         <artifactId>siddhi</artifactId>
         <groupId>io.siddhi</groupId>
-        <version>5.1.1-SNAPSHOT</version>
+        <version>5.1.1</version>
         <relativePath>../../pom.xml</relativePath>
     </parent>
     <modelVersion>4.0.0</modelVersion>
diff --git a/modules/siddhi-query-compiler/pom.xml b/modules/siddhi-query-compiler/pom.xml
index 228cb3f0b0..76a576553f 100644
--- a/modules/siddhi-query-compiler/pom.xml
+++ b/modules/siddhi-query-compiler/pom.xml
@@ -20,7 +20,7 @@
     <parent>
         <artifactId>siddhi</artifactId>
         <groupId>io.siddhi</groupId>
-        <version>5.1.1-SNAPSHOT</version>
+        <version>5.1.1</version>
         <relativePath>../../pom.xml</relativePath>
     </parent>
     <modelVersion>4.0.0</modelVersion>
diff --git a/modules/siddhi-samples/performance-samples/pom.xml b/modules/siddhi-samples/performance-samples/pom.xml
index 8300d5cbb9..adbae8c9c9 100644
--- a/modules/siddhi-samples/performance-samples/pom.xml
+++ b/modules/siddhi-samples/performance-samples/pom.xml
@@ -21,7 +21,7 @@
     <parent>
         <groupId>io.siddhi</groupId>
         <artifactId>siddhi-samples</artifactId>
-        <version>5.1.1-SNAPSHOT</version>
+        <version>5.1.1</version>
     </parent>
     <modelVersion>4.0.0</modelVersion>
     <artifactId>performance-samples</artifactId>
diff --git a/modules/siddhi-samples/pom.xml b/modules/siddhi-samples/pom.xml
index fb35bbe53e..c1074b44ba 100644
--- a/modules/siddhi-samples/pom.xml
+++ b/modules/siddhi-samples/pom.xml
@@ -20,7 +20,7 @@
     <parent>
         <artifactId>siddhi</artifactId>
         <groupId>io.siddhi</groupId>
-        <version>5.1.1-SNAPSHOT</version>
+        <version>5.1.1</version>
         <relativePath>../../pom.xml</relativePath>
     </parent>
     <modelVersion>4.0.0</modelVersion>
diff --git a/modules/siddhi-samples/quick-start-samples/pom.xml b/modules/siddhi-samples/quick-start-samples/pom.xml
index 8858d8d802..a984d76c52 100644
--- a/modules/siddhi-samples/quick-start-samples/pom.xml
+++ b/modules/siddhi-samples/quick-start-samples/pom.xml
@@ -21,7 +21,7 @@
     <parent>
         <artifactId>siddhi-samples</artifactId>
         <groupId>io.siddhi</groupId>
-        <version>5.1.1-SNAPSHOT</version>
+        <version>5.1.1</version>
     </parent>
     <modelVersion>4.0.0</modelVersion>
 
diff --git a/modules/siddhi-service/pom.xml b/modules/siddhi-service/pom.xml
index 2f2b86b336..486f954871 100644
--- a/modules/siddhi-service/pom.xml
+++ b/modules/siddhi-service/pom.xml
@@ -20,7 +20,7 @@
     <parent>
         <artifactId>siddhi</artifactId>
         <groupId>io.siddhi</groupId>
-        <version>5.1.1-SNAPSHOT</version>
+        <version>5.1.1</version>
         <relativePath>../../pom.xml</relativePath>
     </parent>
 
diff --git a/pom.xml b/pom.xml
index e883f41e9d..c804f1eed6 100644
--- a/pom.xml
+++ b/pom.xml
@@ -23,7 +23,7 @@
     <groupId>io.siddhi</groupId>
     <artifactId>siddhi</artifactId>
     <packaging>pom</packaging>
-    <version>5.1.1-SNAPSHOT</version>
+    <version>5.1.1</version>
     <name>Siddhi</name>
     <description>Siddhi, Stream Processing and Complex Event Processing Engine</description>
 
@@ -834,7 +834,7 @@
         <url>https://github.com/siddhi-io/siddhi.git</url>
         <developerConnection>scm:git:https://github.com/siddhi-io/siddhi.git</developerConnection>
         <connection>scm:git:https://github.com/siddhi-io/siddhi.git</connection>
-        <tag>HEAD</tag>
+        <tag>v5.1.1</tag>
     </scm>
 
     <repositories>