diff --git a/Dockerfile b/Dockerfile
index 6d1b71c..1181744 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -8,6 +8,7 @@ COPY setup-sshd.sh /usr/local/bin/setup-sshd.sh
 
 RUN wget https://apk.corretto.aws/amazoncorretto.rsa.pub -O /etc/apk/keys/amazoncorretto.rsa.pub && \
     echo "https://apk.corretto.aws" | tee -a /etc/apk/repositories && \
+    apk upgrade --no-cache -a && \
     apk add --no-cache ca-certificates tzdata tini bash git git-lfs netcat-openbsd openssh-server \
                        amazon-corretto-8 \
                        amazon-corretto-11 \