diff --git a/.github/workflows/maven.yml b/.github/workflows/maven.yml
index 940cd30b..e9585d0d 100644
--- a/.github/workflows/maven.yml
+++ b/.github/workflows/maven.yml
@@ -22,7 +22,7 @@ jobs:
 
   # ── Linux ────────────────────────────────────────────────────────────────────
   linux:
-    name: Build and test — Linux (Java 21 / Spark 3.5)
+    name: Build and test — Linux (Java 21 / Spark 4.0)
     runs-on: ubuntu-latest
 
     steps:
diff --git a/pom.xml b/pom.xml
index 5cdea1ca..e5b1fc07 100644
--- a/pom.xml
+++ b/pom.xml
@@ -31,12 +31,12 @@
         <dependency>
             <groupId>org.apache.spark</groupId>
             <artifactId>spark-core_2.13</artifactId>
-            <version>3.5.1</version>
+            <version>4.0.1</version>
         </dependency>
         <dependency>
             <groupId>org.apache.spark</groupId>
             <artifactId>spark-sql_2.13</artifactId>
-            <version>3.5.1</version>
+            <version>4.0.1</version>
             <scope>compile</scope>
         </dependency>