diff --git a/src/Dockerfile b/src/Dockerfile
index 7f711da..b12a656 100644
--- a/src/Dockerfile
+++ b/src/Dockerfile
@@ -1,6 +1,6 @@
 FROM restic/restic:0.9.6
 
-RUN apk update && apk add python3 dcron mariadb-client postgresql-client
+RUN apk update && apk add ca-certificates python3 dcron mariadb-client postgresql-client && rm -rf /var/cache/apk/*
 
 ADD . /restic-compose-backup
 WORKDIR /restic-compose-backup