diff --git a/molecule/default/converge.yml b/molecule/default/converge.yml
index de97748..e617b59 100644
--- a/molecule/default/converge.yml
+++ b/molecule/default/converge.yml
@@ -13,6 +13,7 @@
     keycloak_quarkus_proxy_mode: none
     keycloak_quarkus_offline_install: true
     keycloak_quarkus_download_path: /tmp/keycloak/
+    keycloak_quarkus_java_heap_opts: "-Xms640m -Xmx640m "
   roles:
     - role: keycloak_quarkus
     - role: keycloak_realm
diff --git a/molecule/quarkus/converge.yml b/molecule/quarkus/converge.yml
index 1114478..fa2d70f 100644
--- a/molecule/quarkus/converge.yml
+++ b/molecule/quarkus/converge.yml
@@ -24,6 +24,7 @@
     keycloak_quarkus_systemd_wait_for_log: true
     keycloak_quarkus_restart_health_check: false # would fail because of self-signed cert
     keycloak_quarkus_version: 26.2.4
+    keycloak_quarkus_java_heap_opts: "-Xms1024m -Xmx1024m"
     keycloak_quarkus_additional_env_vars:
       - key: KC_FEATURES_DISABLED
         value: impersonation,kerberos
diff --git a/molecule/quarkus_devmode/converge.yml b/molecule/quarkus_devmode/converge.yml
index 6c0b14f..a596478 100644
--- a/molecule/quarkus_devmode/converge.yml
+++ b/molecule/quarkus_devmode/converge.yml
@@ -11,6 +11,8 @@
     keycloak_quarkus_start_dev: True
     keycloak_quarkus_proxy_mode: none
     keycloak_quarkus_java_home: /opt/openjdk/
+    keycloak_quarkus_java_heap_opts: "-Xms640m -Xmx640m"
+
   roles:
     - role: keycloak_quarkus
     - role: keycloak_realm