diff --git a/gradle.properties b/gradle.properties
index 3916ad9c06..2c8b82f441 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -1,3 +1,9 @@
+# Daemon heap. Gradle's small default OOMs ("daemon GC thrashing" / "Java heap space") on the CI
+# runners for the proprietary and saas flavors, which pull in more modules and run Quarkus
+# augmentation plus parallel test execution in the daemon. 4g fits comfortably on the 16GB build
+# runners (the core flavor has fewer modules and passed even on the default heap).
+org.gradle.jvmargs=-Xmx4g -XX:MaxMetaspaceSize=1g
+
 # Enables parallel execution of tasks, allowing multiple tasks to run simultaneously
 org.gradle.parallel=true