diff --git a/doc/requirements.txt b/doc/requirements.txt
index b99d5a8..be51183 100644
--- a/doc/requirements.txt
+++ b/doc/requirements.txt
@@ -3,7 +3,7 @@
 Sphinx~=3.4.0
 sphinx-rtd-theme==1.1.1
 sphinxcontrib-apidoc==0.3.0
-breathe==4.25.1
+breathe~=4.26.0
 commonmark==0.9.1
 docutils==0.16
 recommonmark==0.7.1