diff --git a/Dockerfile b/Dockerfile
index b46a0d24..f5b9b067 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -24,6 +24,7 @@ ENV LANG=en_GB.UTF-8
 
 
 RUN apt-get update \
+    && apt-get install -y gnupg2 \
     && curl https://packages.microsoft.com/keys/microsoft.asc | apt-key add - \
     && curl https://packages.microsoft.com/config/debian/9/prod.list \
         > /etc/apt/sources.list.d/mssql-release.list