diff --git a/buildSrc/src/main/java/org/springframework/boot/build/bom/bomr/UpgradeBom.java b/buildSrc/src/main/java/org/springframework/boot/build/bom/bomr/UpgradeBom.java
index 47aecb9631..2a00ab5556 100644
--- a/buildSrc/src/main/java/org/springframework/boot/build/bom/bomr/UpgradeBom.java
+++ b/buildSrc/src/main/java/org/springframework/boot/build/bom/bomr/UpgradeBom.java
@@ -67,7 +67,7 @@ public class UpgradeBom extends DefaultTask {
 
 	private String libraries;
 
-	private int threads = 8;
+	private int threads = 2;
 
 	@Inject
 	public UpgradeBom(BomExtension bom) {