diff --git a/php-apache/Dockerfile b/php-apache/Dockerfile
index 3d361b1..6bfb3a2 100644
--- a/php-apache/Dockerfile
+++ b/php-apache/Dockerfile
@@ -67,7 +67,7 @@ RUN set -ex; \
 	curl -o roundcubemail.tar.gz.asc -SL https://github.com/roundcube/roundcubemail/releases/download/${ROUNDCUBEMAIL_VERSION}/roundcubemail-${ROUNDCUBEMAIL_VERSION}-complete.tar.gz.asc; \
 	export GNUPGHOME="$(mktemp -d)"; \
 	# ha.pool.sks-keyservers.net seems to be unreliable, use pgp.mit.edu as fallback
-	gpg --keyserver ha.pool.sks-keyservers.net --recv-keys F3E4C04BB3DB5D4215C45F7F5AB2BAA141C4F7D5 || gpg --keyserver pgp.mit.edu --recv-keys F3E4C04BB3DB5D4215C45F7F5AB2BAA141C4F7D5; \
+	gpg --no-tty --keyserver ha.pool.sks-keyservers.net --recv-keys F3E4C04BB3DB5D4215C45F7F5AB2BAA141C4F7D5 || gpg --no-tty --keyserver pgp.mit.edu --recv-keys F3E4C04BB3DB5D4215C45F7F5AB2BAA141C4F7D5; \
 	gpg --batch --verify roundcubemail.tar.gz.asc roundcubemail.tar.gz; \
 	tar -xzf roundcubemail.tar.gz -C /usr/src/; \
 	gpgconf --kill all; \
diff --git a/php-fpm/Dockerfile b/php-fpm/Dockerfile
index 51b1027..19f5a80 100644
--- a/php-fpm/Dockerfile
+++ b/php-fpm/Dockerfile
@@ -64,7 +64,7 @@ RUN set -ex; \
 	curl -o roundcubemail.tar.gz.asc -SL https://github.com/roundcube/roundcubemail/releases/download/${ROUNDCUBEMAIL_VERSION}/roundcubemail-${ROUNDCUBEMAIL_VERSION}-complete.tar.gz.asc; \
 	export GNUPGHOME="$(mktemp -d)"; \
 	# ha.pool.sks-keyservers.net seems to be unreliable, use pgp.mit.edu as fallback
-	gpg --keyserver ha.pool.sks-keyservers.net --recv-keys F3E4C04BB3DB5D4215C45F7F5AB2BAA141C4F7D5 || gpg --keyserver pgp.mit.edu --recv-keys F3E4C04BB3DB5D4215C45F7F5AB2BAA141C4F7D5; \
+	gpg --no-tty --keyserver ha.pool.sks-keyservers.net --recv-keys F3E4C04BB3DB5D4215C45F7F5AB2BAA141C4F7D5 || gpg --no-tty --keyserver pgp.mit.edu --recv-keys F3E4C04BB3DB5D4215C45F7F5AB2BAA141C4F7D5; \
 	gpg --batch --verify roundcubemail.tar.gz.asc roundcubemail.tar.gz; \
 	tar -xzf roundcubemail.tar.gz -C /usr/src/; \
 	gpgconf --kill all; \