diff --git a/Dockerfile b/Dockerfile
index 666fab3..68e014e 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -76,6 +76,8 @@ RUN GPG_KEYS=B0F4253373F8F6F510D42178520A9993A1C052F8 \
     pcre-dev \
     zlib-dev \
     bzip2-dev \
+    imap-dev \
+    openssl-dev \
     linux-headers \
     curl \
     gnupg \