diff --git a/Dockerfile b/Dockerfile
index adf25e2..8979e9f 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -2,7 +2,7 @@ FROM alpine
 
 WORKDIR /src
 RUN \
-  apk add --no-cache git && \
+  apk add --no-cache git openssl && \
   git clone https://github.com/acmesh-official/acme.sh.git && \
   apk del git