diff --git a/docs/rtfd-requirements.txt b/docs/rtfd-requirements.txt
index d02c7aa..de94176 100644
--- a/docs/rtfd-requirements.txt
+++ b/docs/rtfd-requirements.txt
@@ -3,5 +3,5 @@ cffi==1.12.2
 Sphinx==1.8.4
 sphinx-rtd-theme==0.4.3
 sphinxcontrib-websupport==1.1.0
-trio==0.11.0
+trio==0.18.0
 git+https://github.com/Ninpo/trio-inotify.git