diff --git a/pyproject.toml b/pyproject.toml
index be97f0421ed..66c384f6fac 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -92,7 +92,6 @@ src_paths = "lib"
 honor_noqa = true
 
 [tool.mypy]
-python_version = 3.7
 files = ['lib/spack/llnl/**/*.py', 'lib/spack/spack/**/*.py', './var/spack/repos/builtin/packages/*/package.py']
 mypy_path = ['bin', 'lib/spack', 'lib/spack/external', 'var/spack/repos/builtin']
 allow_redefinition = true