diff --git a/lib/spack/docs/requirements.txt b/lib/spack/docs/requirements.txt
index 10e19f093e5eec..6d9d04fc3eb7ad 100644
--- a/lib/spack/docs/requirements.txt
+++ b/lib/spack/docs/requirements.txt
@@ -10,4 +10,4 @@ pytest==7.4.3
 isort==5.12.0
 black==23.10.1
 flake8==6.1.0
-mypy==1.6.1
+mypy==1.15.0