diff --git a/.github/workflows/jax-tests.yml b/.github/workflows/jax-tests.yml
index 468fe593..809826c0 100644
--- a/.github/workflows/jax-tests.yml
+++ b/.github/workflows/jax-tests.yml
@@ -39,8 +39,7 @@ jobs:
       - name: Install
         run: |
           python -m pip install --upgrade pip
-          python -m pip install -e '.[test]' 'jax[cpu]'
-          python -m pip uninstall -y lithops  # tests don't run on Lithops
+          python -m pip install -e '.[test-jax]'
 
       - name: Install for Mac
         if: matrix.os == 'macos-14'
@@ -51,7 +50,8 @@ jobs:
         run: |
           # exclude tests that rely on structured types since JAX doesn't support these
           # exclude tests that rely on randomness because JAX is picky about this.
-          pytest -k "not argmax and not argmin and not mean and not apply_reduction and not broadcast_trick and not groupby and not random"
+          # TODO(#494): Turn back on tests that do visualization when the "FileNotFound" error is fixed. These are "visualization", "plan_scaling", and "optimization".
+          pytest -k "not argmax and not argmin and not mean and not apply_reduction and not broadcast_trick and not groupby and not random and not visualization and not plan_scaling and not optimization"
         env:
           CUBED_BACKEND_ARRAY_API_MODULE: jax.numpy
           JAX_ENABLE_X64:  matrix.os != 'macos-14'
diff --git a/cubed/tests/test_core.py b/cubed/tests/test_core.py
index 4ce48349..11a391ec 100644
--- a/cubed/tests/test_core.py
+++ b/cubed/tests/test_core.py
@@ -383,7 +383,7 @@ def test_reduction_not_enough_memory(tmp_path):
 
 
 def test_partial_reduce(spec):
-    a = xp.asarray(np.arange(242).reshape((11, 22)), chunks=(3, 4), spec=spec)
+    a = xp.asarray(np.arange(242, dtype=np.int32).reshape((11, 22)), chunks=(3, 4), spec=spec, dtype=xp.int32)
     b = partial_reduce(a, np.sum, split_every={0: 2})
     c = partial_reduce(b, np.sum, split_every={0: 2})
     assert_array_equal(
@@ -468,13 +468,13 @@ def test_compute_multiple_different_specs(tmp_path):
 
 
 def test_visualize(tmp_path):
-    a = xp.asarray([[1, 2, 3], [4, 5, 6], [7, 8, 9]], dtype=xp.float64, chunks=(2, 2))
+    a = xp.asarray([[1, 2, 3], [4, 5, 6], [7, 8, 9]], dtype=xp.float32, chunks=(2, 2))
     b = cubed.random.random((3, 3), chunks=(2, 2))
     c = xp.add(a, b)
     d = c.rechunk((3, 1))
     e = c * 3
 
-    f = xp.asarray([[1, 2, 3], [4, 5, 6], [7, 8, 9]], chunks=(2, 2))
+    f = xp.asarray([[1, 2, 3], [4, 5, 6], [7, 8, 9]], chunks=(2, 2), dtype=xp.float32)
     g = f * 4
 
     assert not (tmp_path / "e.dot").exists()
diff --git a/pyproject.toml b/pyproject.toml
index 9c28bc33..689d3688 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -110,6 +110,15 @@ test-modal = [
     "pytest-mock",
 ]
 
+test-jax = [
+    "cubed[diagnostics]",  # modal tests separate due to conflicting package reqs
+    "dill",
+    "numpy_groupies",
+    "pytest",
+    "pytest-cov",
+    "pytest-mock",
+    "jax",
+]
 [project.urls]
 homepage = "https://github.com/cubed-dev/cubed"
 documentation = "https://tomwhite.github.io/cubed"