diff --git a/Dockerfile b/Dockerfile
index ea6d499..7f114fe 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -44,7 +44,7 @@ RUN source "$HOME/.sdkman/bin/sdkman-init.sh" && \
 # needed for R 
 ENV DEBIAN_FRONTEND noninteractive
 
-RUN apt-key adv --keyserver keyserver.ubuntu.com --recv-keys E298A3A825C0D65DFD57CBB651716619E084DAB9
+RUN apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys E298A3A825C0D65DFD57CBB651716619E084DAB9
 RUN add-apt-repository -y 'deb https://cloud.r-project.org/bin/linux/ubuntu bionic-cran40/'
 RUN apt-get update