diff --git a/swh/storage/tests/test_cassandra.py b/swh/storage/tests/test_cassandra.py
--- a/swh/storage/tests/test_cassandra.py
+++ b/swh/storage/tests/test_cassandra.py
@@ -103,8 +103,8 @@
         ],
         start_new_session=True,
         env={
-            'MAX_HEAP_SIZE': '300M',
-            'HEAP_NEWSIZE': '50M',
+            'MAX_HEAP_SIZE': '500M',
+            'HEAP_NEWSIZE': '200M',
             'JVM_OPTS': '-Xlog:gc=error:file=%s/gc.log' % cassandra_log,
         },
         stdout=stdout,