diff --git a/Dockerfile b/Dockerfile
index 7ffcdd3..2985616 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -86,8 +86,9 @@ RUN set -x ; \
     texlive-plain-generic texlive-latex-recommended texlive-fonts-recommended \
     texlive-xetex fonts-liberation \
     lsb-release && \
-  echo "deb http://apt.postgresql.org/pub/repos/apt/ $(lsb_release -cs)-pgdg main" > /etc/apt/sources.list.d/pgdg.list && \
-  (wget --quiet -O - https://www.postgresql.org/media/keys/ACCC4CF8.asc | apt-key add -) && \
+  echo "deb [signed-by=/etc/apt/keyrings/postgresql.asc] http://apt.postgresql.org/pub/repos/apt/ $(lsb_release -cs)-pgdg main" > /etc/apt/sources.list.d/pgdg.list && \
+  mkdir -p /etc/apt/keyrings && \
+  wget --quiet -O - https://www.postgresql.org/media/keys/ACCC4CF8.asc > /etc/apt/keyrings/postgresql.asc && \
   DEBIAN_FRONTEND="noninteractive" apt-get -y update && \
   DEBIAN_FRONTEND="noninteractive" apt-get -y install postgresql-client && \
   DEBIAN_FRONTEND="noninteractive" apt-get -q -y install git cpanminus make gcc libperl-dev && \