diff --git a/lib/spack/docs/requirements.txt b/lib/spack/docs/requirements.txt
index fcfa7f9cce3e7a..0c97bff4a8f889 100644
--- a/lib/spack/docs/requirements.txt
+++ b/lib/spack/docs/requirements.txt
@@ -11,4 +11,4 @@ pytest==8.4.1
 isort==6.0.1
 black==25.1.0
 flake8==7.3.0
-mypy==1.17.1
+mypy==1.18.1