diff --git a/.drone.yml b/.drone.yml
index ea29f2a..1476406 100644
--- a/.drone.yml
+++ b/.drone.yml
@@ -15,6 +15,7 @@ steps:
   - apt-get -y update
   - apt-get -y install graphviz plantuml make python3-pip git
   - pip install -r requirements.txt
+  - git submodule update --init --recursive
   - make bundle
 
 trigger:
@@ -48,6 +49,7 @@ steps:
   - apt-get -y update
   - apt-get -y install graphviz plantuml make python3 python3-pip git
   - pip install -r requirements.txt
+  - git submodule update --init --recursive
   - make -j4 bundle
 
 trigger: