diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index de95e66f001bc8983743142a551cd09af0ef5a35..5e8bd81efcef867abf59dbbbd1dcbcfcf0efc4c1 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -3,6 +3,9 @@
     tags: [docker]
     retry: 2
     interruptible: true
+    variables:
+        LANG: C
+        DEBIAN_FRONTEND: noninteractive
     script:
         - apt-get update -yqq
         - apt-get install -yq php-cli
@@ -22,7 +25,7 @@ debian:
             - CODENAME: [jessie, stretch, buster]
     before_script:
         - apt-get update -yqq
-        - apt-get install -yq apt-transport-https ca-certificates curl
+        - apt-get install -yqq apt-transport-https ca-certificates curl
         - curl -sSL -o /etc/apt/trusted.gpg.d/php.gpg https://packages.sury.org/php/apt.gpg
         - echo "deb https://packages.sury.org/php/ $CODENAME main" > /etc/apt/sources.list.d/php.list
 
@@ -33,7 +36,7 @@ ubuntu:
         CODENAME: xenial
     before_script:
         - apt-get update -yqq
-        - apt-get install -yq apt-transport-https ca-certificates curl gpg
+        - apt-get install -yq apt-transport-https ca-certificates curl gnupg
         - gpg --recv-keys 14AA40EC0831756756D7F66C4F4EA0AAE5267A6C
         - gpg --export 14AA40EC0831756756D7F66C4F4EA0AAE5267A6C | apt-key add -
         - echo "deb http://ppa.launchpad.net/ondrej/php/ubuntu $CODENAME main" > /etc/apt/sources.list.d/php.list