diff --git a/.drone.yml b/.drone.yml
index cb7233f..5ef2072 100644
--- a/.drone.yml
+++ b/.drone.yml
@@ -11,6 +11,7 @@ steps:
   image: ubuntu:focal
 
   commands:
+  - export DEBIAN_FRONTEND=noninteractive
   - apt-get -y update
   - apt-get -y install graphviz plantuml make python3-pip git
   - pip install -r requirements.txt
@@ -43,6 +44,7 @@ steps:
     THEME_REPO_REF: github.com/crowcpp/darxygen.git
 
   commands:
+  - export DEBIAN_FRONTEND=noninteractive
   - export DRONE_BUILD_DIR=$PWD
   - apt-get -y update
   - apt-get -y install graphviz plantuml make python3 python3-pip git