diff --git a/Dockerfile b/Dockerfile
index 3742697..5e3fe09 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -10,7 +10,7 @@ WORKDIR /opt/azafea-metrics-proxy/src
 
 COPY Pipfile.lock .
 
-RUN pipenv install --ignore-pipfile --dev
+RUN pipenv sync --dev
 
 COPY . .