diff --git a/Dockerfile b/Dockerfile
index 16a614c..ca394bc 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,5 +1,6 @@
 FROM alpine
-RUN addgroup -S loginsrv && adduser -S -g loginsrv loginsrv
+RUN apk --update add ca-certificates \
+    && addgroup -S loginsrv && adduser -S -g loginsrv loginsrv
 USER loginsrv
 ENV LOGINSRV_HOST=0.0.0.0 LOGINSRV_PORT=8080
 COPY loginsrv /