diff --git a/Dockerfile b/Dockerfile
index a8dcb97d0ae31a2306d26d9f484bd5c649379c3f..eb0728001638d8f32dea1f48ca270bd9f4891e29 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM alpine:3.11.3
+FROM alpine:3
 
 RUN apk add --update \
     nginx \
@@ -21,7 +21,8 @@ RUN apk add --update \
     php7-dom \
     php7-fileinfo \
     php7-redis \
-    && rm -rf /var/cache/apk/*
+    && rm -rf /var/cache/apk/* \
+    && update-ca-certificates
 
 WORKDIR /html