diff --git a/Dockerfile b/Dockerfile
index 3c332f5..8bc89e6 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -50,12 +50,15 @@ RUN apt-get update && apt-get install -y libgmp3-dev \
  && docker-php-ext-install gmp
 
 ##
-## SVG support
+## SVG and LibreSign support
 ##
 RUN apt-get update && apt-get install -y \
     libmagickcore-6.q16-6-extra \
   && rm -rf /var/lib/apt/lists/*
 
+RUN sed -i'' 's|.*<policy domain="coder".*"PDF".*|<policy domain="coder" rights="read \| write" pattern="PDF" />|g' \
+        /etc/ImageMagick-6/policy.xml
+
 ##
 ## Raise memory limit for PHP
 ##