diff --git a/ubuntu/Dockerfile b/ubuntu/Dockerfile
index e55a982..4bc6f64 100644
--- a/ubuntu/Dockerfile
+++ b/ubuntu/Dockerfile
@@ -5,5 +5,6 @@ RUN apt-get -y update && \
   apt-get install -y apt-transport-https ca-certificates curl software-properties-common && \
   curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add - && \
   add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu focal stable" && \
+  apt-get update -y && \
   apt-get install -y docker-ce
 CMD [ "zsh" ]