diff --git a/pom.xml b/pom.xml
index 491705735..40b66a10d 100644
--- a/pom.xml
+++ b/pom.xml
@@ -1531,7 +1531,7 @@
         <lz4-java.version>1.8.0</lz4-java.version>
         <scala.version>2.12.18</scala.version>
         <scala.binary.version>2.12</scala.binary.version>
-        <spark.version>3.5.5</spark.version>
+        <spark.version>3.5.6</spark.version>
         <zstd-jni.version>1.5.5-4</zstd-jni.version>
       </properties>
     </profile>
diff --git a/project/CelebornBuild.scala b/project/CelebornBuild.scala
index 32d6367c0..4387bfbf2 100644
--- a/project/CelebornBuild.scala
+++ b/project/CelebornBuild.scala
@@ -912,7 +912,7 @@ object Spark35 extends SparkClientProjects {
   val lz4JavaVersion = "1.8.0"
   val sparkProjectScalaVersion = "2.12.18"
 
-  val sparkVersion = "3.5.5"
+  val sparkVersion = "3.5.6"
   val zstdJniVersion = "1.5.5-4"
 
   override val sparkColumnarShuffleVersion: String = "3.5"