diff --git a/mypy.ini b/mypy.ini
index 410c6ae5..8317abc8 100644
--- a/mypy.ini
+++ b/mypy.ini
@@ -49,9 +49,6 @@ ignore_missing_imports = True
 [mypy-ld.*]
 ignore_missing_imports = True
 
-[mypy-psutil.*]
-ignore_missing_imports = True
-
 [mypy-pytest.*]
 ignore_missing_imports = True
 
diff --git a/src/e3/anod/spec.py b/src/e3/anod/spec.py
index 02cfa7eb..f2b9fd52 100644
--- a/src/e3/anod/spec.py
+++ b/src/e3/anod/spec.py
@@ -38,7 +38,7 @@
     from e3.anod.buildspace import BuildSpace
     from e3.anod.sandbox import SandBox
     from e3.env import BaseEnv
-    from e3.os.process import STDOUT_VALUE, DEVNULL_VALUE, PIPE_VALUE
+    from e3.os.process import DEVNULL_VALUE, PIPE_VALUE
 
     import e3.anod.package
     import e3.anod.sandbox
@@ -544,7 +544,7 @@ def shell(
         self,
         *command: str,
         parse_shebang: bool = True,
-        output: STDOUT_VALUE | DEVNULL_VALUE | PIPE_VALUE | str | IO | None = None,
+        output: DEVNULL_VALUE | PIPE_VALUE | str | IO | None = None,
         python_executable: None = None,
         **kwargs: Any,
     ) -> e3.os.process.Run:
diff --git a/src/e3/os/process.py b/src/e3/os/process.py
index 9befe889..f8ee877d 100644
--- a/src/e3/os/process.py
+++ b/src/e3/os/process.py
@@ -234,7 +234,7 @@ def __init__(
         self,
         cmds: AnyCmdLine,
         cwd: str | None = None,
-        output: STDOUT_VALUE | DEVNULL_VALUE | PIPE_VALUE | str | IO | None = PIPE,
+        output: DEVNULL_VALUE | PIPE_VALUE | str | IO | None = PIPE,
         error: STDOUT_VALUE | DEVNULL_VALUE | PIPE_VALUE | str | IO | None = STDOUT,
         input: DEVNULL_VALUE  # noqa: A002
         | PIPE_VALUE
diff --git a/src/e3/vcs/git.py b/src/e3/vcs/git.py
index 10e665bd..ec8703a1 100644
--- a/src/e3/vcs/git.py
+++ b/src/e3/vcs/git.py
@@ -43,7 +43,7 @@
         TextIO,
     )
     from collections.abc import Iterator
-    from e3.os.process import Run, STDOUT_VALUE, DEVNULL_VALUE, PIPE_VALUE
+    from e3.os.process import Run, DEVNULL_VALUE, PIPE_VALUE
 
     Git_Cmd = List[Optional[str]]
     GIT_LOG_STREAM_VALUE = Literal[-4]
@@ -109,8 +109,7 @@ def create(cls, repo_path: str, initial_content_path: str | None = None) -> str:
     def git_cmd(
         self,
         cmd: Git_Cmd,
-        output: STDOUT_VALUE
-        | DEVNULL_VALUE
+        output: DEVNULL_VALUE
         | PIPE_VALUE
         | GIT_LOG_STREAM_VALUE
         | str