diff --git a/Dockerfile b/Dockerfile
index 270775e..82a234d 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -13,4 +13,8 @@ RUN go build -o bin/ddns \
 
 FROM alpine AS runner
 COPY --from=builder /app/bin/ddns /usr/bin/
+RUN apk --no-cache add --no-check-certificate ca-certificates \
+    && update-ca-certificates
+RUN apk add --no-cache tzdata
+
 ENTRYPOINT /usr/bin/ddns