diff --git a/Dockerfile b/Dockerfile
index 35cfed6..12af94b 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -5,4 +5,4 @@ CMD ["/usr/sbin/saslauthd", "-d", "-a", "ldap", "-O", "/etc/sasl2/saslauthd.conf
 
 COPY entrypoint.sh /docker-entrypoint.sh
 
-RUN apt update && DEBIAN_FRONTEND=noninteractive apt install -y sasl2-bin libsasl2-modules-ldap && rm -rf /var/lib/apt/lists/*
+RUN apt update && DEBIAN_FRONTEND=noninteractive apt install -y ca-certificates sasl2-bin libsasl2-modules-ldap && rm -rf /var/lib/apt/lists/*