diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 0742e29..95b0c5d 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -35,7 +35,7 @@ jobs:
             python: "3.9"
             os: ubuntu-latest
             toxenv: format
-          - name: Linting with flake8
+          - name: Linting with flake8 + ruff
             python: "3.9"
             os: ubuntu-latest
             toxenv: lint
diff --git a/doc/_static/make_logo.py b/doc/_static/make_logo.py
index 79212a8..da20ac1 100644
--- a/doc/_static/make_logo.py
+++ b/doc/_static/make_logo.py
@@ -1,5 +1,5 @@
 import matplotlib.pyplot as plt
-from numpy import meshgrid, linspace
+from numpy import linspace, meshgrid
 
 fig, ax = plt.subplots(figsize=(27, 9))
 x, y = meshgrid((0, 100), linspace(0, 0.1, 1000))
diff --git a/pyproject.toml b/pyproject.toml
index cdf611c..6ba0519 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -21,6 +21,7 @@ classifiers = [
         'Intended Audience :: Science/Research',
         "License :: OSI Approved :: MIT License",
         "Operating System :: OS Independent",
+        "Typing :: Typed",
 ]
 
 [project.urls]
diff --git a/src/spei/__init__.py b/src/spei/__init__.py
index 2c59221..1b4672e 100644
--- a/src/spei/__init__.py
+++ b/src/spei/__init__.py
@@ -1,4 +1,4 @@
 # flake8: noqa
 from . import plot, si, utils
-from ._version import __version__
+from ._version import __version__, show_versions
 from .si import sgi, spei, spi, ssfi
diff --git a/src/spei/_version.py b/src/spei/_version.py
index e19434e..058111b 100644
--- a/src/spei/_version.py
+++ b/src/spei/_version.py
@@ -1 +1,16 @@
-__version__ = "0.3.3"
+from importlib import metadata
+from platform import python_version
+
+__version__ = "0.3.4"
+
+
+def show_versions() -> None:
+    msg = f"Versions\npython: {python_version()}\nspei: {__version__}\n"
+
+    requirements = metadata.requires("spei")
+    if requirements:
+        deps = [x for x in requirements if "extra" not in x]
+        for dep in deps:
+            msg += f"{dep}: {metadata.version(dep)}\n"
+
+    print(msg)
diff --git a/tests/fixtures.py b/tests/conftest.py
similarity index 100%
rename from tests/fixtures.py
rename to tests/conftest.py
diff --git a/tests/test_dist_utils.py b/tests/test_dist_utils.py
index 2e98317..b318086 100644
--- a/tests/test_dist_utils.py
+++ b/tests/test_dist_utils.py
@@ -1,7 +1,7 @@
-from spei.utils import dists_test
+from pandas import Series
 
-from .fixtures import head
+from spei.utils import dists_test
 
 
-def test_dists_test(head) -> None:
+def test_dists_test(head: Series) -> None:
     _ = dists_test(head)
diff --git a/tests/test_plots.py b/tests/test_plots.py
index a817e10..bbe24f9 100644
--- a/tests/test_plots.py
+++ b/tests/test_plots.py
@@ -5,8 +5,6 @@
 from spei.plot import dist, monthly_density
 from spei.plot import si as plot_si
 
-from .fixtures import prec, si
-
 mpl.use("Agg")  # prevent _tkinter.TclError: Can't find a usable tk.tcl error
 
 
diff --git a/tests/test_si.py b/tests/test_si.py
index b9d9333..e4a20f9 100644
--- a/tests/test_si.py
+++ b/tests/test_si.py
@@ -2,8 +2,6 @@
 
 from spei import sgi, spei, spi, ssfi
 
-from .fixtures import evap, head, prec
-
 
 def test_spi(prec: Series) -> None:
     spi(prec.rolling("30D", min_periods=30).sum().dropna(), prob_zero=True)
diff --git a/tests/test_validate.py b/tests/test_validate.py
index 1c7432e..537466d 100644
--- a/tests/test_validate.py
+++ b/tests/test_validate.py
@@ -1,5 +1,6 @@
-import pytest
 import logging
+
+import pytest
 from pandas import DataFrame, Series, to_datetime
 
 from spei.utils import validate_index, validate_series
diff --git a/tests/test_version.py b/tests/test_version.py
new file mode 100644
index 0000000..0520036
--- /dev/null
+++ b/tests/test_version.py
@@ -0,0 +1,10 @@
+import spei as si
+
+
+def test_version() -> None:
+    assert isinstance(si.__version__, str)
+    assert si.__version__.count(".") == 2
+
+
+def test_show_versions():
+    si.show_versions()