diff --git a/.readthedocs.yml b/.readthedocs.yml
index 9412521..c7ed44c 100644
--- a/.readthedocs.yml
+++ b/.readthedocs.yml
@@ -6,7 +6,7 @@ build:
     python: "3.10"
   jobs:
     post_install:
-      - pip install poetry
+      - pip install poetry==1.8.5
       # Tell poetry to not use a virtual environment
       # Install dependencies with 'docs' dependency group
       # https://python-poetry.org/docs/managing-dependencies/#dependency-groups