diff --git a/lib/spack/docs/requirements.txt b/lib/spack/docs/requirements.txt
index 85fd1722af1..355f612d1f0 100644
--- a/lib/spack/docs/requirements.txt
+++ b/lib/spack/docs/requirements.txt
@@ -10,4 +10,4 @@ pytest==7.4.0
 isort==5.12.0
 black==23.7.0
 flake8==6.1.0
-mypy==1.5.0
+mypy==1.5.1