diff --git a/Dockerfile b/Dockerfile
index 83514a4..044faee 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -2,6 +2,7 @@
 FROM python:3.6-alpine
 
 RUN mkdir -p /var/matemat/db /var/matemat/upload
+RUN apk --update add libmagic
 ADD . /
 RUN pip3 install -r /requirements.txt