diff --git a/build.gradle b/build.gradle
index a11e480d11..220fed27a1 100644
--- a/build.gradle
+++ b/build.gradle
@@ -170,7 +170,7 @@ def validationXsdPath = project(':sbe-tool').projectDir.toString() + '/src/main/
 
 project(':sbe-tool') {
     dependencies {
-        compile 'org.agrona:Agrona:0.5.5'
+        compile 'org.agrona:Agrona:0.5.6'
 
         testCompile files('build/classes/generated')
     }
diff --git a/version.txt b/version.txt
index 946b77a870..8af85beb51 100644
--- a/version.txt
+++ b/version.txt
@@ -1 +1 @@
-1.5.3-SNAPSHOT
+1.5.3