diff --git a/Dockerfile b/Dockerfile
index 2f1a6b2e..62efec59 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,7 +1,8 @@
 FROM sismics/jetty:9.2.20-jdk7
 MAINTAINER benjamin.gam@gmail.com
 
-RUN apt-get -y -q install tesseract-ocr tesseract-ocr-fra tesseract-ocr-jpn
+RUN apt-get update && apt-get -y -q install tesseract-ocr tesseract-ocr-fra tesseract-ocr-jpn && \
+    apt-get clean && rm -rf /var/lib/apt/lists/*
 
 ENV TESSDATA_PREFIX /usr/share/tesseract-ocr
 ENV LC_NUMERIC C