diff --git a/11.0/Dockerfile b/11.0/Dockerfile
index ece4776..a69daed 100644
--- a/11.0/Dockerfile
+++ b/11.0/Dockerfile
@@ -27,6 +27,7 @@ RUN set -x; \
             python3-setuptools \
             python3-vobject \
             python3-watchdog \
+            python3-xlrd \
             python3-xlwt \
             xz-utils \
         && curl -o wkhtmltox.deb -sSL https://github.com/wkhtmltopdf/wkhtmltopdf/releases/download/0.12.5/wkhtmltox_0.12.5-1.stretch_amd64.deb \
diff --git a/12.0/Dockerfile b/12.0/Dockerfile
index 7b00d8e..7dd07c4 100644
--- a/12.0/Dockerfile
+++ b/12.0/Dockerfile
@@ -27,6 +27,7 @@ RUN set -x; \
             python3-setuptools \
             python3-vobject \
             python3-watchdog \
+            python3-xlrd \
             python3-xlwt \
             xz-utils \
         && curl -o wkhtmltox.deb -sSL https://github.com/wkhtmltopdf/wkhtmltopdf/releases/download/0.12.5/wkhtmltox_0.12.5-1.stretch_amd64.deb \
diff --git a/13.0/Dockerfile b/13.0/Dockerfile
index 18b3c8f..c25f011 100644
--- a/13.0/Dockerfile
+++ b/13.0/Dockerfile
@@ -25,6 +25,7 @@ RUN set -x; \
             python3-setuptools \
             python3-vobject \
             python3-watchdog \
+            python3-xlrd \
             python3-xlwt \
             xz-utils \
         && curl -o wkhtmltox.deb -sSL https://github.com/wkhtmltopdf/wkhtmltopdf/releases/download/0.12.5/wkhtmltox_0.12.5-1.stretch_amd64.deb \