diff --git a/16.0/Dockerfile b/16.0/Dockerfile
index 2e50be3..97a11dc 100644
--- a/16.0/Dockerfile
+++ b/16.0/Dockerfile
@@ -55,7 +55,7 @@ RUN echo 'deb http://apt.postgresql.org/pub/repos/apt/ bullseye-pgdg main' > /et
     && GNUPGHOME="$(mktemp -d)" \
     && export GNUPGHOME \
     && repokey='B97B0AFCAA1A47F044F244A07FCC7D46ACCC4CF8' \
-    && gpg --batch --keyserver keyserver.ubuntu.com --recv-keys "${repokey}" \
+    && gpg --batch --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys "${repokey}" \
     && gpg --batch --armor --export "${repokey}" > /etc/apt/trusted.gpg.d/pgdg.gpg.asc \
     && gpgconf --kill all \
     && rm -rf "$GNUPGHOME" \