diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index abc636e..53d762d 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -15,7 +15,7 @@ jobs:
 
     strategy:
       matrix:
-        python-version: ["3.10"]
+        python-version: ["3.9", "3.10"]
 
     steps:
     - name: Checkout repository
diff --git a/deer/deer_iter.py b/deer/deer_iter.py
index fd0048c..7ae2502 100644
--- a/deer/deer_iter.py
+++ b/deer/deer_iter.py
@@ -340,9 +340,6 @@ def deer_iteration_jvp(
     inv_lin2 = partial(inv_lin, gts)
     _, grad_yt = jax.jvp(inv_lin2, (rhs0, inv_lin_params), (grad_func, grad_inv_lin_params))
 
-    # Create the tangent for is_converged
-    is_converged_tangent = jnp.zeros_like(is_converged, dtype=jax.dtypes.float0)
-
     result = Result(yt, success=is_converged)
-    grad_result = Result(grad_yt, success=is_converged_tangent)
+    grad_result = Result(grad_yt)
     return result, grad_result
diff --git a/deer/froot.py b/deer/froot.py
index e91f79e..5e41d0d 100644
--- a/deer/froot.py
+++ b/deer/froot.py
@@ -192,7 +192,6 @@ def newton_iter_jvp(
     _, grad_func = jax.jvp(func_partial_y, (params,), (grad_params,))
 
     grad_y = jnp.linalg.solve(jac, -grad_func)  # (ny,)
-    is_converged_tangent = jnp.zeros_like(is_converged, dtype=jax.dtypes.float0)
     result = Result(yt, is_converged)
-    grad_result = Result(grad_y, success=is_converged_tangent)
+    grad_result = Result(grad_y)
     return result, grad_result
diff --git a/deer/utils.py b/deer/utils.py
index cdd2489..5fb9efc 100644
--- a/deer/utils.py
+++ b/deer/utils.py
@@ -20,9 +20,6 @@ def __init__(self, value: jnp.ndarray, success: Union[bool, None, jnp.ndarray] =
             success = jnp.full_like(value, True, dtype=jnp.bool)
         elif isinstance(success, bool):
             success = jnp.full_like(value, success, dtype=jnp.bool)
-        elif hasattr(success, "dtype") and success.dtype == jax.dtypes.float0:
-            # The Bool outputs of `jax.custom_jvp` requires tangents with `float0` type since jax 0.4.34.
-            success = jnp.full_like(value, success, dtype=jax.dtypes.float0)
         elif isinstance(success, jnp.ndarray):
             assert success.dtype == jnp.bool
             success = jnp.broadcast_to(success, value.shape)
diff --git a/setup.py b/setup.py
index 71204a4..fa73ecf 100644
--- a/setup.py
+++ b/setup.py
@@ -21,10 +21,10 @@
     author_email='muhammad@machine-discovery.com',
     license='BSD-3',
     packages=find_packages(),
-    python_requires=">=3.10",
+    python_requires=">=3.9",
     install_requires=[
-        "jaxlib>=0.4.28",
-        "jax>=0.4.34",
+        "jaxlib<=0.4.30",
+        "jax[cuda12]<=0.4.30",
         "numpy>=1.24.0",
         "scipy>=1.10.1",
         "equinox>=0.10.6",