diff --git a/Dockerfile b/Dockerfile
index c1363b6..3f9ff76 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -3,7 +3,7 @@ FROM golang:1.21-alpine
 WORKDIR /app
 
 RUN apk update && \
-    apk add openssl && \
+    apk add openssl ca-certificates && \
   openssl s_client -connect helloworld.letsencrypt.org:443 -showcerts </dev/null 2>/dev/null | sed -e '/-----BEGIN/,/-----END/!d' | tee "/usr/local/share/ca-certificates/ca.crt" >/dev/null && \
   update-ca-certificates