diff --git a/.docker/php53/Dockerfile b/.docker/php53/Dockerfile
index fa7261082..9998612b5 100644
--- a/.docker/php53/Dockerfile
+++ b/.docker/php53/Dockerfile
@@ -6,7 +6,7 @@ ENV PHP_VERSION 5.3.29
 RUN set -eux; \
   \
   apt-get update; \
-  apt-get install -y \
+  apt-get install -y --force-yes \
     curl \
     autoconf2.13 \
   ; \
@@ -40,7 +40,7 @@ RUN set -eux; \
     bison \
     libbison-dev \
   ; \
-  apt-get purge -y --auto-remove \
+  apt-get purge -y --force-yes --auto-remove \
     autoconf2.13 \
   ; \
   rm -r /usr/src/php
diff --git a/.docker/php74_81/Dockerfile b/.docker/php74_81/Dockerfile
index 7d13d7c82..e471c7dee 100644
--- a/.docker/php74_81/Dockerfile
+++ b/.docker/php74_81/Dockerfile
@@ -8,7 +8,7 @@ RUN docker-php-ext-install pdo_mysql
 #
 RUN set -eux; \
   apt-get update; \
-  apt-get install -y --no-upgrade --no-install-recommends \
+  apt-get install -y --force-yes --no-upgrade --no-install-recommends \
     libonig-dev \
   ; \
   \