diff --git a/Dockerfile b/Dockerfile
index 7911f41..1c785e9 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -22,7 +22,7 @@ RUN apt-get update && \
       libxml2-utils \
       xmlstarlet \
     && \
-    apt-get clean
+    apt-get clean && rm -rf /var/lib/apt/lists/*
 
 
 # Install Leptonica and Tesseract.