diff --git a/12.0/Dockerfile b/12.0/Dockerfile
index 1098831..8233509 100644
--- a/12.0/Dockerfile
+++ b/12.0/Dockerfile
@@ -23,6 +23,7 @@ RUN set -x; \
             python3-vobject \
             python3-watchdog \
             xz-utils \
+            python3-xlrd \
         && curl -o wkhtmltox.deb -sSL https://github.com/wkhtmltopdf/wkhtmltopdf/releases/download/0.12.5/wkhtmltox_0.12.5-1.stretch_amd64.deb \
         && echo '7e35a63f9db14f93ec7feeb0fce76b30c08f2057 wkhtmltox.deb' | sha1sum -c - \
         && dpkg --force-depends -i wkhtmltox.deb\