diff --git a/docker/Dockerfile b/docker/Dockerfile
index f650531..3e96c5c 100644
--- a/docker/Dockerfile
+++ b/docker/Dockerfile
@@ -5,7 +5,7 @@ ENV PYTHONUNBUFFERED=1
 RUN git clone https://github.com/Paillat-dev/presentator.git
 RUN pip install -r /presentator/requirements.txt
 RUN apt-get update
-RUN apt-get install --y chromium # for marp
+RUN apt-get install -y chromium # for marp
 WORKDIR /presentator
 RUN wget https://github.com/marp-team/marp-cli/releases/download/v2.3.0/marp-cli-v2.3.0-linux.tar.gz
 RUN tar -xvf marp-cli-v2.3.0-linux.tar.gz