diff --git a/docs/requirements.txt b/docs/requirements.txt
index 6cffaa878506d605c8e24f477ecc1d54e05b3843..f322f5207efb7644afeaf8325ace029aa7f139d2 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -1,4 +1,5 @@
 # Defining the exact version will make sure things don't break
+libopenmpi-dev
 sphinx==5.3.0
 sphinx_rtd_theme==1.1.1
 readthedocs-sphinx-search==0.1.1