diff --git a/doc/sphinx-guides/source/conf.py b/doc/sphinx-guides/source/conf.py
index 4153e93a64f..1b2a106add3 100755
--- a/doc/sphinx-guides/source/conf.py
+++ b/doc/sphinx-guides/source/conf.py
@@ -425,3 +425,5 @@
 
 # Example configuration for intersphinx: refer to the Python standard library.
 intersphinx_mapping = {'http://docs.python.org/': None}
+# Suppress "WARNING: unknown mimetype for ..." https://github.com/IQSS/dataverse/issues/3391
+suppress_warnings = ['epub.unknown_project_files']