diff --git a/3.7/alpine3.7/Dockerfile b/3.7/alpine3.7/Dockerfile
index 900755c8f..5fbfb393b 100644
--- a/3.7/alpine3.7/Dockerfile
+++ b/3.7/alpine3.7/Dockerfile
@@ -29,7 +29,7 @@ RUN set -ex \
 	&& wget -O python.tar.xz "https://www.python.org/ftp/python/${PYTHON_VERSION%%[a-z]*}/Python-$PYTHON_VERSION.tar.xz" \
 	&& wget -O python.tar.xz.asc "https://www.python.org/ftp/python/${PYTHON_VERSION%%[a-z]*}/Python-$PYTHON_VERSION.tar.xz.asc" \
 	&& export GNUPGHOME="$(mktemp -d)" \
-	&& gpg --keyserver ha.pool.sks-keyservers.net --recv-keys "$GPG_KEY" \
+	&& gpg --keyserver hkp://ha.pool.sks-keyservers.net:80 --recv-keys "$GPG_KEY" \
 	&& gpg --batch --verify python.tar.xz.asc python.tar.xz \
 	&& { command -v gpgconf > /dev/null && gpgconf --kill all || :; } \
 	&& rm -rf "$GNUPGHOME" python.tar.xz.asc \
diff --git a/3.7/alpine3.8/Dockerfile b/3.7/alpine3.8/Dockerfile
index 2b15390c2..df46804f1 100644
--- a/3.7/alpine3.8/Dockerfile
+++ b/3.7/alpine3.8/Dockerfile
@@ -29,7 +29,7 @@ RUN set -ex \
 	&& wget -O python.tar.xz "https://www.python.org/ftp/python/${PYTHON_VERSION%%[a-z]*}/Python-$PYTHON_VERSION.tar.xz" \
 	&& wget -O python.tar.xz.asc "https://www.python.org/ftp/python/${PYTHON_VERSION%%[a-z]*}/Python-$PYTHON_VERSION.tar.xz.asc" \
 	&& export GNUPGHOME="$(mktemp -d)" \
-	&& gpg --keyserver ha.pool.sks-keyservers.net --recv-keys "$GPG_KEY" \
+	&& gpg --keyserver hkp://ha.pool.sks-keyservers.net:80 --recv-keys "$GPG_KEY" \
 	&& gpg --batch --verify python.tar.xz.asc python.tar.xz \
 	&& { command -v gpgconf > /dev/null && gpgconf --kill all || :; } \
 	&& rm -rf "$GNUPGHOME" python.tar.xz.asc \
diff --git a/3.7/stretch/Dockerfile b/3.7/stretch/Dockerfile
index 68a27000b..2d7388c88 100644
--- a/3.7/stretch/Dockerfile
+++ b/3.7/stretch/Dockerfile
@@ -27,7 +27,7 @@ RUN set -ex \
 	&& wget -O python.tar.xz "https://www.python.org/ftp/python/${PYTHON_VERSION%%[a-z]*}/Python-$PYTHON_VERSION.tar.xz" \
 	&& wget -O python.tar.xz.asc "https://www.python.org/ftp/python/${PYTHON_VERSION%%[a-z]*}/Python-$PYTHON_VERSION.tar.xz.asc" \
 	&& export GNUPGHOME="$(mktemp -d)" \
-	&& gpg --keyserver ha.pool.sks-keyservers.net --recv-keys "$GPG_KEY" \
+	&& gpg --keyserver hkp://ha.pool.sks-keyservers.net:80 --recv-keys "$GPG_KEY" \
 	&& gpg --batch --verify python.tar.xz.asc python.tar.xz \
 	&& { command -v gpgconf > /dev/null && gpgconf --kill all || :; } \
 	&& rm -rf "$GNUPGHOME" python.tar.xz.asc \
diff --git a/3.7/stretch/slim/Dockerfile b/3.7/stretch/slim/Dockerfile
index 6992650ff..81c4bf464 100644
--- a/3.7/stretch/slim/Dockerfile
+++ b/3.7/stretch/slim/Dockerfile
@@ -50,7 +50,7 @@ RUN set -ex \
 	&& wget -O python.tar.xz "https://www.python.org/ftp/python/${PYTHON_VERSION%%[a-z]*}/Python-$PYTHON_VERSION.tar.xz" \
 	&& wget -O python.tar.xz.asc "https://www.python.org/ftp/python/${PYTHON_VERSION%%[a-z]*}/Python-$PYTHON_VERSION.tar.xz.asc" \
 	&& export GNUPGHOME="$(mktemp -d)" \
-	&& gpg --keyserver ha.pool.sks-keyservers.net --recv-keys "$GPG_KEY" \
+	&& gpg --keyserver hkp://ha.pool.sks-keyservers.net:80 --recv-keys "$GPG_KEY" \
 	&& gpg --batch --verify python.tar.xz.asc python.tar.xz \
 	&& { command -v gpgconf > /dev/null && gpgconf --kill all || :; } \
 	&& rm -rf "$GNUPGHOME" python.tar.xz.asc \