diff --git a/.docker/compose/docker-compose.e2e.yml b/.docker/compose/docker-compose.e2e.yml
index 5d8373b7..81b85e3a 100644
--- a/.docker/compose/docker-compose.e2e.yml
+++ b/.docker/compose/docker-compose.e2e.yml
@@ -31,16 +31,12 @@ services:
       - CHARON_CADDY_BINARY=caddy
       - CHARON_ACME_STAGING=true
       # FEATURE_CERBERUS_ENABLED deprecated - Cerberus enabled by default
-    volumes:
-      # Use tmpfs for E2E test data - fresh on every run
-      - e2e_data:/app/data
+    tmpfs:
+      # True tmpfs for E2E test data - fresh on every run, in-memory only
+      - /app/data:size=100M,mode=1755
     healthcheck:
       test: ["CMD-SHELL", "curl -fsS http://localhost:8080/api/v1/health || exit 1"]
       interval: 5s
       timeout: 5s
       retries: 10
       start_period: 10s
-
-volumes:
-  e2e_data:
-    driver: local