diff --git a/.github/workflows/python-publish.yml b/.github/workflows/python-publish.yml
index c5c5c00..ae67e28 100755
--- a/.github/workflows/python-publish.yml
+++ b/.github/workflows/python-publish.yml
@@ -52,6 +52,7 @@ jobs:
 
   publish-to-testpypi:
     name: Publish Python 🐍 distribution 📦 to TestPyPI
+    if: startsWith(github.ref, 'refs/tags/')  # only publish to TestPyPI on tag pushes
     needs:
     - build
     runs-on: ubuntu-latest
diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 40d2444..7bc837c 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ['3.8', '3.9', '3.10', '3.11']
+        python-version: ['3.10', '3.11', '3.12', '3.13']
 
     steps:
     - uses: actions/checkout@v4
diff --git a/pyproject.toml b/pyproject.toml
index 88a7cfe..3212d8a 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -19,7 +19,7 @@ classifiers = [
     "Intended Audience :: Science/Research",
     "Topic :: Scientific/Engineering :: Bio-Informatics",
 ]
-requires-python = ">=3.6.0"
+requires-python = ">=3.10"
 dependencies = [
     "mappy",
     "edlib",