diff --git a/build-container.sh b/build-container.sh
index a63a788..10c25df 100644
--- a/build-container.sh
+++ b/build-container.sh
@@ -1,2 +1,3 @@
 #!/bin/sh
+docker pull mcr.microsoft.com/dotnet/sdk
 docker build ./source/ -t stevedinn/caddy-log-converter:latest