diff --git a/Dockerfile b/Dockerfile
index 0c93b7a..cb08c98 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -22,7 +22,8 @@ RUN apk add --no-cache \
     openssl \
     spamassassin-client \
     libstdc++ \
-    libmilter
+    libmilter \
+    db
 
 RUN addgroup -g 2222 access
 RUN addgroup postfix access