diff --git a/test/external-modules/esql-heap-attack/src/javaRestTest/java/org/elasticsearch/xpack/esql/heap_attack/HeapAttackIT.java b/test/external-modules/esql-heap-attack/src/javaRestTest/java/org/elasticsearch/xpack/esql/heap_attack/HeapAttackIT.java
index bd85b0cd2b454..59ce3c2dbb1cf 100644
--- a/test/external-modules/esql-heap-attack/src/javaRestTest/java/org/elasticsearch/xpack/esql/heap_attack/HeapAttackIT.java
+++ b/test/external-modules/esql-heap-attack/src/javaRestTest/java/org/elasticsearch/xpack/esql/heap_attack/HeapAttackIT.java
@@ -636,7 +636,7 @@ public void testLookupExplosion() throws IOException {
 
     public void testLookupExplosionManyMatches() throws IOException {
         assertCircuitBreaks(() -> {
-            Map<?, ?> result = lookupExplosion(900, 10000);
+            Map<?, ?> result = lookupExplosion(1500, 10000);
             logger.error("should have failed but got {}", result);
         });
     }
@@ -656,7 +656,7 @@ public void testLookupExplosionNoFetchManyMatches() throws IOException {
     }
 
     public void testLookupExplosionBigString() throws IOException {
-        int sensorDataCount = 250;
+        int sensorDataCount = 150;
         int lookupEntries = 1;
         Map<?, ?> map = lookupExplosionBigString(sensorDataCount, lookupEntries);
         assertMap(map, matchesMap().extraOk().entry("values", List.of(List.of(sensorDataCount * lookupEntries))));