diff --git a/Dockerfile-alpine.template b/Dockerfile-alpine.template
index 60addc96ac..fb6973b663 100644
--- a/Dockerfile-alpine.template
+++ b/Dockerfile-alpine.template
@@ -72,7 +72,7 @@ RUN set -xe; \
 		wget -O php.tar.xz.asc "$PHP_ASC_URL"; \
 		export GNUPGHOME="$(mktemp -d)"; \
 		for key in $GPG_KEYS; do \
-			gpg --keyserver ha.pool.sks-keyservers.net --recv-keys "$key"; \
+			gpg --keyserver ipv4.pool.sks-keyservers.net --recv-keys "$key"; \
 		done; \
 		gpg --batch --verify php.tar.xz.asc php.tar.xz; \
 		rm -rf "$GNUPGHOME"; \
diff --git a/Dockerfile-debian.template b/Dockerfile-debian.template
index a24c063373..68eae2fba0 100644
--- a/Dockerfile-debian.template
+++ b/Dockerfile-debian.template
@@ -80,7 +80,7 @@ RUN set -xe; \
 		wget -O php.tar.xz.asc "$PHP_ASC_URL"; \
 		export GNUPGHOME="$(mktemp -d)"; \
 		for key in $GPG_KEYS; do \
-			gpg --keyserver ha.pool.sks-keyservers.net --recv-keys "$key"; \
+			gpg --keyserver ipv4.pool.sks-keyservers.net --recv-keys "$key"; \
 		done; \
 		gpg --batch --verify php.tar.xz.asc php.tar.xz; \
 		rm -rf "$GNUPGHOME"; \