diff --git a/server/build.gradle b/server/build.gradle
index 2603dc60..46d0f4d7 100644
--- a/server/build.gradle
+++ b/server/build.gradle
@@ -22,7 +22,7 @@ micronaut {
 }
 mainClassName = "com.exacaster.lighter.Application"
 
-def sparkVersion = project.hasProperty("SPARK_VERSION") ? project.getProperty("SPARK_VERSION") : '3.5.3'
+def sparkVersion = project.hasProperty("SPARK_VERSION") ? project.getProperty("SPARK_VERSION") : '4.0.0-preview2'
 def hadoopVersion = '3.4.0'
 def k8sClientVersion = '6.13.3'
 def shedlockVersion = '5.16.0'