diff --git a/src/main/python/ddadevops/devops_build.py b/src/main/python/ddadevops/devops_build.py
index 7de1005..b9e83f6 100644
--- a/src/main/python/ddadevops/devops_build.py
+++ b/src/main/python/ddadevops/devops_build.py
@@ -1,5 +1,4 @@
 from typing import Optional
-from subprocess import run, CalledProcessError
 import deprecation
 from .domain import (
     Devops, DevopsFactory
diff --git a/src/main/python/ddadevops/domain/release.py b/src/main/python/ddadevops/domain/release.py
index 040db05..882a8fc 100644
--- a/src/main/python/ddadevops/domain/release.py
+++ b/src/main/python/ddadevops/domain/release.py
@@ -2,7 +2,6 @@ from enum import Enum
 from typing import Optional
 from pathlib import Path
 from .common import (
-    filter_none,
     Validateable,
     Devops,
 )
diff --git a/src/main/python/ddadevops/infrastructure/release_mixin/infrastructure_api.py b/src/main/python/ddadevops/infrastructure/release_mixin/infrastructure_api.py
index 09587b9..5d297b9 100644
--- a/src/main/python/ddadevops/infrastructure/release_mixin/infrastructure_api.py
+++ b/src/main/python/ddadevops/infrastructure/release_mixin/infrastructure_api.py
@@ -1,6 +1,5 @@
 import json
 import re
-import subprocess as sub
 from abc import ABC, abstractmethod
 from typing import Optional
 from pathlib import Path
diff --git a/src/main/python/ddadevops/infrastructure/release_mixin/repo.py b/src/main/python/ddadevops/infrastructure/release_mixin/repo.py
index 308d6c0..4fd65df 100644
--- a/src/main/python/ddadevops/infrastructure/release_mixin/repo.py
+++ b/src/main/python/ddadevops/infrastructure/release_mixin/repo.py
@@ -1,4 +1,4 @@
-from typing import Optional
+
 from src.main.python.ddadevops.domain import (
     ReleaseContext,
     Version,
diff --git a/src/main/python/ddadevops/release_mixin.py b/src/main/python/ddadevops/release_mixin.py
index c7eddb7..597ee6a 100644
--- a/src/main/python/ddadevops/release_mixin.py
+++ b/src/main/python/ddadevops/release_mixin.py
@@ -1,4 +1,3 @@
-from typing import Optional
 from pybuilder.core import Project
 from src.main.python.ddadevops.devops_build import DevopsBuild
 from src.main.python.ddadevops.infrastructure.release_mixin import ReleaseContextRepository, ReleaseTypeRepository, VersionRepository, GitApi, EnvironmentApi