diff --git a/docker-compose.yml b/docker-compose.yml
index 3c1a36f..ec0a538 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -43,6 +43,7 @@ services:
       TESSERA_SMTP_PASSWORD: ${TESSERA_SMTP_PASSWORD:-}
       TESSERA_SMTP_FROM: ${TESSERA_SMTP_FROM:-Tessera <tessera@tessera.local>}
       TESSERA_APP_URL: ${TESSERA_APP_URL:-http://localhost:3000}
+      CALENDAR_ENCRYPTION_KEY: ${CALENDAR_ENCRYPTION_KEY:-}
     healthcheck:
       test: ["CMD", "wget", "--no-verbose", "--tries=1", "--spider", "http://localhost:3001/health"]
       interval: 10s