diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 61274c36713dcaac5a3d46be43dccc2ef5eed39d..0c3c1a0a0a17029d373e10712151d257dc185ad9 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -8,6 +8,7 @@ tests:
     variables:
         GIT_DEPTH: 1
     script:
+        - git submodule sync
         - git submodule update --init --recursive
         - python3 -m pip install -r submodules/dagflow/requirements.txt
         - mkdir output