diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 851d09b5b..a0fd0754d 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -43,6 +43,9 @@ stages:
 # TODO: documentation
 dynamic:prepare:
   stage: dynamic
+  before_script: &dynamic-before
+    - apt-get -y update
+    - apt-get -y install git
   script:
     - FRONTEND_IMAGE_VERSION=`git log docker/frontend/Dockerfile | grep '^commit' | wc --lines`
     - BACKEND_IMAGE_VERSION=`git log docker/backend/Dockerfile | grep '^commit' | wc --lines`
@@ -56,6 +59,7 @@ dynamic:execute:
   stage: dynamic
   needs:
     - dynamic:prepare
+  before_script: *dynamic-before
   trigger:
     strategy: depend
     include: