diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 51c7071..37394f8 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -17,7 +17,7 @@ jobs:
       fail-fast: false
       matrix:
         os: ['ubuntu-latest', 'macos-latest', 'windows-latest']
-        python-version: ['3.8', '3.9', '3.10', '3.11', '3.12']
+        python-version: ['3.11', '3.12']
     steps:
       - uses: actions/checkout@v3
       - name: Set up Python ${{ matrix.python-version }}
diff --git a/pyproject.toml b/pyproject.toml
index 1e30a44..4e1105d 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -33,7 +33,7 @@ build-backend = "poetry.core.masonry.api"
 [tool.tox]
 legacy_tox_ini = """
 [tox]
-envlist = py38,py39,py310,py311,py312
+envlist = py311,py312
 skip_missing_interpreters = true
 [testenv]
 commands = pytest
@@ -107,7 +107,6 @@ per-file-ignores = {}
 # Allow unused variables when underscore-prefixed.
 dummy-variable-rgx = "^(_+|(_+[a-zA-Z0-9_]*[a-zA-Z0-9]+?))$"
 
-target-version = "py39"
 line-length = 120
 
 [tool.ruff.isort]
@@ -115,9 +114,6 @@ known-first-party = ["rcx_tk"]
 force-single-line = true
 no-lines-before = ["future","standard-library","third-party","first-party","local-folder"]
 
-[tool.bumpversion]
-current_version = "0.1.0"
-
 [[tool.bumpversion.files]]
 filename = "src/rcx_tk/__init__.py"