diff --git a/.gitignore b/.gitignore
index 030368d1..11a35419 100644
--- a/.gitignore
+++ b/.gitignore
@@ -5,6 +5,7 @@
 build/
 dist/
 venv/
+_testing/
 
 # Building the documentation
 docs/_autosummary
diff --git a/optax/_src/alias_test.py b/optax/_src/alias_test.py
index 8e11b197..f80d9b64 100644
--- a/optax/_src/alias_test.py
+++ b/optax/_src/alias_test.py
@@ -158,8 +158,8 @@ def test_optimizers_can_be_wrapped_in_inject_hyperparams(
     else:
       opt_inject = _inject.inject_hyperparams(opt_factory)(**opt_kwargs)
 
-    params = [-jnp.ones((2, 3)), jnp.ones((2, 5, 2))]
-    grads = [jnp.ones((2, 3)), -jnp.ones((2, 5, 2))]
+    params = [jnp.negative(jnp.ones((2, 3))), jnp.ones((2, 5, 2))]
+    grads = [jnp.ones((2, 3)), jnp.negative(jnp.ones((2, 5, 2)))]
 
     state = self.variant(opt.init)(params)
     updates, new_state = self.variant(opt.update)(grads, state, params)
diff --git a/optax/_src/wrappers_test.py b/optax/_src/wrappers_test.py
index c8fee120..a567802a 100644
--- a/optax/_src/wrappers_test.py
+++ b/optax/_src/wrappers_test.py
@@ -364,21 +364,21 @@ def test_multi_steps_skip_not_finite(self):
       updates, opt_state = opt_update(dict(a=jnp.ones([])), opt_state, params)
       self.assertEqual(int(opt_state.mini_step), 0)
       params = update.apply_updates(params, updates)
-      np.testing.assert_array_equal(params['a'], -jnp.ones([]))
+      np.testing.assert_array_equal(params['a'], jnp.negative(jnp.ones([])))
 
     with self.subTest('test_inf_updates'):
       updates, opt_state = opt_update(
           dict(a=jnp.array(float('inf'))), opt_state, params)
       self.assertEqual(int(opt_state.mini_step), 0)  # No increase in mini_step
       params = update.apply_updates(params, updates)
-      np.testing.assert_array_equal(params['a'], -jnp.ones([]))
+      np.testing.assert_array_equal(params['a'], jnp.negative(jnp.ones([])))
 
     with self.subTest('test_nan_updates'):
       updates, opt_state = opt_update(
           dict(a=jnp.full([], float('nan'))), opt_state, params)
       self.assertEqual(int(opt_state.mini_step), 0)  # No increase in mini_step
       params = update.apply_updates(params, updates)
-      np.testing.assert_array_equal(params['a'], -jnp.ones([]))
+      np.testing.assert_array_equal(params['a'], jnp.negative(jnp.ones([])))
 
     with self.subTest('test_final_good_updates'):
       updates, opt_state = opt_update(dict(a=jnp.ones([])), opt_state, params)
@@ -387,7 +387,7 @@ def test_multi_steps_skip_not_finite(self):
       updates, opt_state = opt_update(dict(a=jnp.ones([])), opt_state, params)
       self.assertEqual(int(opt_state.mini_step), 0)
       params = update.apply_updates(params, updates)
-      np.testing.assert_array_equal(params['a'], -jnp.full([], 2.))
+      np.testing.assert_array_equal(params['a'], jnp.negative(jnp.full([], 2.)))
 
 
 class MaskedTest(chex.TestCase):
diff --git a/optax/contrib/common_test.py b/optax/contrib/common_test.py
index 8ca588b3..01ac61c3 100644
--- a/optax/contrib/common_test.py
+++ b/optax/contrib/common_test.py
@@ -104,8 +104,8 @@ def test_optimizers_can_be_wrapped_in_inject_hyperparams(
     opt = opt_factory(**opt_kwargs)
     opt_inject = _inject.inject_hyperparams(opt_factory)(**opt_kwargs)
 
-    params = [-jnp.ones((2, 3)), jnp.ones((2, 5, 2))]
-    grads = [jnp.ones((2, 3)), -jnp.ones((2, 5, 2))]
+    params = [jnp.negative(jnp.ones((2, 3))), jnp.ones((2, 5, 2))]
+    grads = [jnp.ones((2, 3)), jnp.negative(jnp.ones((2, 5, 2)))]
 
     state = self.variant(opt.init)(params)
     updates, new_state = self.variant(opt.update)(grads, state, params)
diff --git a/test.sh b/test.sh
index 84168195..4272d580 100755
--- a/test.sh
+++ b/test.sh
@@ -18,6 +18,7 @@ set -xeuo pipefail
 
 # Install deps in a virtual env.
 rm -rf _testing
+rm -rf .pytype
 mkdir -p _testing
 readonly VENV_DIR="$(mktemp -d -p `pwd`/_testing optax-env.XXXXXXXX)"
 # in the unlikely case in which there was something in that directory
@@ -82,6 +83,9 @@ cd docs && make html
 make doctest
 cd ..
 
+# cleanup
+rm -rf _testing
+
 set +u
 deactivate
 echo "All tests passed. Congrats!"