diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 800182e0..f7502ca5 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -42,7 +42,7 @@ jobs:
       matrix:
         os: [ubuntu-latest, windows-latest, macos-13, macos-14]
         arch: [auto, aarch64]
-        py: [cp38, cp39, cp310, cp311, cp312]
+        py: [cp39, cp310, cp311, cp312]
         exclude:
           - os: windows-latest
             arch: aarch64
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 34d91d57..7597e72f 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -24,10 +24,10 @@ jobs:
             python-version: "3.11"
             installs: "numpy>=2.0.0rc1"
           - os: macos-14
-            python-version: "3.8"
+            python-version: "3.9"
             installs: "numpy==1.21.0 scipy matplotlib"
           - os: ubuntu-latest
-            python-version: "pypy-3.8"
+            python-version: "pypy-3.9"
           - os: ubuntu-latest
             python-version: "3.12"
             installs: "'numpy>=2.0.0rc1' scipy matplotlib"
diff --git a/noxfile.py b/noxfile.py
index f65b6df7..2d95046f 100644
--- a/noxfile.py
+++ b/noxfile.py
@@ -15,6 +15,8 @@
     "COVERAGE_CORE": "sysmon",  # faster coverage on Python 3.12
 }
 
+nox.options.sessions = ["test", "mintest", "maxtest"]
+
 
 @nox.session(reuse_venv=True)
 def test(session: nox.Session) -> None:
@@ -23,14 +25,14 @@ def test(session: nox.Session) -> None:
     session.run("pytest", *session.posargs, env=ENV)
 
 
-@nox.session(reuse_venv=True)
-def np2test(session: nox.Session) -> None:
+@nox.session(python="3.12", reuse_venv=True)
+def maxtest(session: nox.Session) -> None:
     """Run the unit and regular tests."""
-    session.install("-e.", "scipy", "pytest", "--pre")
+    session.install("-e.", "scipy", "matplotlib", "pytest", "--pre")
     session.run("pytest", *session.posargs, env=ENV)
 
 
-@nox.session(venv_backend="uv")
+@nox.session(python="3.9", venv_backend="uv")
 def mintest(session: nox.Session) -> None:
     """Run the unit and regular tests."""
     session.install("-e.", "--resolution=lowest-direct")
@@ -38,6 +40,14 @@ def mintest(session: nox.Session) -> None:
     session.run("pytest", *session.posargs)
 
 
+@nox.session(python="pypy3.9", venv_backend="uv")
+def pypy(session: nox.Session) -> None:
+    """Run the unit and regular tests."""
+    session.install("-e.")
+    session.install("pytest")
+    session.run("pytest", *session.posargs)
+
+
 # Python-3.12 provides coverage info faster
 @nox.session(python="3.12", reuse_venv=True)
 def cov(session: nox.Session) -> None:
diff --git a/pyproject.toml b/pyproject.toml
index 2ab3b87d..9533edee 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -11,7 +11,7 @@ maintainers = [
     { email = "hans.dembinski@gmail.com" },
 ]
 readme = "README.rst"
-requires-python = ">=3.8"
+requires-python = ">=3.9"
 license = { file = "LICENSE" }
 classifiers = [
     "Development Status :: 5 - Production/Stable",
diff --git a/tests/test_issue.py b/tests/test_issue.py
index 270f7c99..b2c3bccf 100644
--- a/tests/test_issue.py
+++ b/tests/test_issue.py
@@ -1,4 +1,5 @@
 import numpy as np
+import warnings
 
 
 def test_issue_424():
@@ -152,7 +153,9 @@ def model(x, sig_n, sig_mu, sig_sigma, bkg_n, bkg_tau):
 
         m = Minuit(nll, sig_n=33, sig_mu=ymu, sig_sigma=ysigma, bkg_n=66, bkg_tau=ytau)
         # with Simplex the fit never yields NaN, which is good but not what we want here
-        m.migrad(use_simplex=False)
+        with warnings.catch_warnings():
+            warnings.simplefilter("ignore", RuntimeWarning)
+            m.migrad(use_simplex=False)
 
         if np.isnan(m.fmin.edm):
             assert not m.valid