diff --git a/pyproject.toml b/pyproject.toml
index c197980..f10793c 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -113,6 +113,7 @@ select = [
     "ISC",      # flake8-implicit-str-concat
     "N",        # pep8-naming
     "PL",       # pylint
+    "PT",       # flake8-pytest-style
     "Q",        # flake8-quotes
     "RUF",      # ruff
     "S",        # flake8-bandit
diff --git a/pyshocks/weno.py b/pyshocks/weno.py
index 31eb4ec..48ed3ee 100644
--- a/pyshocks/weno.py
+++ b/pyshocks/weno.py
@@ -142,9 +142,7 @@ def weno_smoothness(
     )
 
 
-def weno_interp(
-    s: Stencil, u: Array, *, mode: ConvolutionType | None = None
-) -> Array:
+def weno_interp(s: Stencil, u: Array, *, mode: ConvolutionType | None = None) -> Array:
     r"""Interpolate the variable *u* at the cell faces for WENO-JS.
 
     The interpolation has the form
@@ -352,7 +350,8 @@ def ss_weno_242_mask(sb: BoundaryStencil, u: Array) -> Array:
     if sb.bc == BoundaryType.Periodic:
         mask = jnp.ones((3, u.size), dtype=u.dtype)
     else:
-        assert sb.sl is not None and sb.sr is not None
+        assert sb.sl is not None
+        assert sb.sr is not None
         mask = jnp.ones((5, u.size + 1), dtype=u.dtype)
         mask = mask.at[0, :].set(0)
         mask = mask.at[-1, :].set(0)
@@ -481,10 +480,12 @@ def ss_weno_242_interp(sb: BoundaryStencil, u: Array) -> Array:
 
     assert isinstance(sb.bc, BoundaryType)
     if sb.bc == BoundaryType.Periodic:
-        assert sb.sl is None and sb.sr is None
+        assert sb.sl is None
+        assert sb.sr is None
         uhat = weno_interp(sb.si, u, mode=ConvolutionType.Wrap)
     else:
-        assert sb.sl is not None and sb.sr is not None
+        assert sb.sl is not None
+        assert sb.sr is not None
 
         uhat = jnp.empty((5, u.size + 1), dtype=u.dtype)
         uhat = uhat.at[1:-1, 1:].set(weno_interp(sb.si, u))
diff --git a/requirements-dev.txt b/requirements-dev.txt
index 9e5772e..e27a5e0 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -24,9 +24,9 @@ fonttools==4.39.4
     # via matplotlib
 iniconfig==2.0.0
     # via pytest
-jax==0.4.10
+jax==0.4.11
     # via pyshocks (pyproject.toml)
-jaxlib==0.4.10
+jaxlib==0.4.11
     # via pyshocks (pyproject.toml)
 kiwisolver==1.4.4
     # via matplotlib
@@ -38,7 +38,7 @@ matplotlib==3.7.1
     #   scienceplots
 mdurl==0.1.2
     # via markdown-it-py
-ml-dtypes==0.1.0
+ml-dtypes==0.2.0
     # via
     #   jax
     #   jaxlib
@@ -89,15 +89,15 @@ python-dateutil==2.8.2
     # via matplotlib
 pyweno @ git+https://github.com/memmett/PyWENO.git
     # via pyshocks (pyproject.toml)
-regex==2023.5.5
+regex==2023.6.3
     # via sphinx-lint
 restructuredtext-lint==1.4.0
     # via doc8
-rich==13.3.5
+rich==13.4.1
     # via pyshocks (pyproject.toml)
-ruff==0.0.270
+ruff==0.0.272
     # via pyshocks (pyproject.toml)
-scienceplots==2.0.1
+scienceplots==2.1.0
     # via pyshocks (pyproject.toml)
 scipy==1.10.1
     # via
@@ -113,7 +113,7 @@ sympy==1.12
     # via pyshocks (pyproject.toml)
 types-dataclasses==0.6.6
     # via pyshocks (pyproject.toml)
-typing-extensions==4.6.2
+typing-extensions==4.6.3
     # via mypy
 wheel==0.40.0
     # via pip-tools
diff --git a/requirements.txt b/requirements.txt
index 49b472c..e66e890 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -4,15 +4,15 @@
 #
 #    pip-compile --output-file=requirements.txt --resolver=backtracking pyproject.toml
 #
-jax==0.4.10
+jax==0.4.11
     # via pyshocks (pyproject.toml)
-jaxlib==0.4.10
+jaxlib==0.4.11
     # via pyshocks (pyproject.toml)
 markdown-it-py==2.2.0
     # via rich
 mdurl==0.1.2
     # via markdown-it-py
-ml-dtypes==0.1.0
+ml-dtypes==0.2.0
     # via
     #   jax
     #   jaxlib
@@ -28,7 +28,7 @@ opt-einsum==3.3.0
     # via jax
 pygments==2.15.1
     # via rich
-rich==13.3.5
+rich==13.4.1
     # via pyshocks (pyproject.toml)
 scipy==1.10.1
     # via
diff --git a/tests/test_weno.py b/tests/test_weno.py
index d9a0a81..8dfef08 100644
--- a/tests/test_weno.py
+++ b/tests/test_weno.py
@@ -45,7 +45,8 @@ def test_weno_smoothness_indicator_vectorization(
     a = rec.s.a
     b = rec.s.b
     c = rec.s.c
-    assert a is not None and b is not None
+    assert a is not None
+    assert b is not None
 
     nghosts = b.shape[-1] // 2
     nstencils = b.shape[0]
@@ -227,14 +228,16 @@ def test_weno_vs_pyweno(
     error_l = rnorm(grid, sl, betal)
     error_r = rnorm(grid, sr, betar)
     logger.info("error smoothness: left %.5e right %.5e", error_l, error_r)
-    assert error_l < 1.0e-5 and error_r < 1.0e-8
+    assert error_l < 1.0e-5
+    assert error_r < 1.0e-8
 
     ulhat, urhat = reconstruct(rec, grid, BoundaryType.Dirichlet, u, u, u)
 
     error_l = rnorm(grid, ul, ulhat)
     error_r = rnorm(grid, ur, urhat)
     logger.info("error reconstruct: left %.5e right %.5e", error_l, error_r)
-    assert error_l < 1.0e-12 and error_r < 1.0e-12
+    assert error_l < 1.0e-12
+    assert error_r < 1.0e-12
 
     # }}}