diff --git a/.readthedocs.yml b/.readthedocs.yml
index 2fa9134..f581f24 100644
--- a/.readthedocs.yml
+++ b/.readthedocs.yml
@@ -1,23 +1,27 @@
 # .readthedocs.yml
 # Read the Docs configuration file
 # See https://docs.readthedocs.io/en/stable/config-file/v2.html for details
 
 # Required
 version: 2
 
+build:
+  apt_packages:
+    - imagemagick
+
 # Build documentation in the doc/ directory with Sphinx
 sphinx:
   configuration: doc/sphinx/source/conf.py
 
 # Build documentation with MkDocs
 #mkdocs:
 #  configuration: mkdocs.yml
 
 # Optionally build your docs in additional formats such as PDF and ePub
 formats: all
 
 # Optionally set the version of Python and requirements required to build your docs
 python:
   version: 3.7
   install:
-    - requirements: doc/requirements.txt
\ No newline at end of file
+    - requirements: doc/requirements.txt