diff --git a/pyproject.toml b/pyproject.toml
index d0faf8f..f659a3f 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,10 @@
+[build-system]
+requires = ["hatchling"]
+build-backend = "hatchling.build"
+
 [project]
 name = "logbesselk"
-version = "3.3.1"
+version = "3.4.0"
 description = "Provide function to calculate the modified Bessel function of the second kind"
 license = "Apache-2.0"
 authors = [
@@ -8,6 +12,7 @@ authors = [
 ]
 readme = "README.md"
 repository = "https://github.com/tk2lab/logbesselk"
+
 classifiers = [
     "Programming Language :: Python :: 3.10",
     "Programming Language :: Python :: 3.11",
@@ -15,27 +20,44 @@ classifiers = [
 ]
 
 requires-python = ">=3.10"
+dependencies = [
+]
 
-[project.optional-dependences]
+[project.optional-dependencies]
 jax = [
-    "jax>=0.4",
-    "jaxlib>=0.4",
+    "jax",
+    "jaxlib",
+]
+jaxcuda = [
+    "jax[cuda12]",
+    "jaxlib",
 ]
 tensorflow = [
     "tensorflow>=2.8",
 ]
 
-[build-system]
-requires = ["hatchling"]
-build-backend = "hatchling.build"
+[tool.hatch.metadata]
+allow-direct-references = true
+
+[tool.hatch.envs.default]
+installer = "uv"
+python = "3.12"
+dependencies = [
+    "pandas",
+    "pytest",
+]
 
-[tool.rye]
-manaed = true
+[tool.hatch.envs.jax]
+features = ["jax"]
+[tool.hatch.envs.jax.env-vars]
+JAX_PLATFORMS = "cpu"
 
-[[tool.rye.sources]]
-name = "jax"
-url = "https://storage.googleapis.com/jax-releases/jax_cuda_releases.html"
-type = "find-links"
+[tool.hatch.envs.jaxcuda]
+template = "jax"
+features = ["jaxcuda"]
+[tool.hatch.envs.jaxcuda.env-vars]
+JAX_PLATFORMS = "cuda"
+CUDA_LAUNCH_BLOCKING = "1"
 
 [tool.pytest.ini_options]
 markers = [
@@ -58,61 +80,3 @@ select = ["E4", "E7", "E9", "F", "W", "N", "I"]
 combine-as-imports = true
 force-wrap-aliases = true
 split-on-trailing-comma = true
-
-[tool.tox]
-legacy_tox_ini = """
-[tox]
-min_version = 4.0
-rye_discovery = true
-env_list = 
-    py{310,311,312}-jax{latest,4}
-    py{310,311}-tf{latest,28,29,210,211,212,213,214,215,216}
-    py312-tf{latest,216}
-    eval_tf
-    eval_jax
-
-[gh-actions]
-python =
-    3.10: py310-jax4, py310-tf28
-    3.12: py312-jaxlatest, py312-tflatest
-
-[testenv:py{310,311,312}-jax{4,latest}]
-deps =
-    jaxlatest: jax[cuda12]
-    jax4: jax[cuda12] (>=0.4,<0.5)
-    pytest
-    pandas
-commands =
-    {envpython} -m pytest tests/test_jax.py {posargs}
-
-[testenv:py{310,311,312}-tf{latest,28,29,210,211,212,213,214,215,216}]
-deps =
-    tflatest: tensorflow
-    tf216: tensorflow (>=2.16,<2.17)
-    tf215: tensorflow (>=2.15,<2.16)
-    tf214: tensorflow (>=2.14,<2.15)
-    tf213: tensorflow (>=2.13,<2.14)
-    tf212: tensorflow (>=2.12,<2.13)
-    tf211: tensorflow (>=2.11,<2.12)
-    tf210: tensorflow (>=2.10,<2.11)
-    tf29: tensorflow (>=2.9,<2.10)
-    tf28: tensorflow (>=2.8,<2.9)
-    pytest
-    pandas
-commands =
-    {envpython} -m pytest tests/test_tensorflow.py {posargs}
-
-[testenv:eval_jax]
-deps =
-    jax[cuda12]
-    pandas
-commands =
-    {envpython} eval/eval_jax.py
-
-[testenv:eval_tf]
-deps =
-    tensorflow
-    pandas
-commands =
-    {envpython} eval/eval_tensorflow.py
-"""
diff --git a/requirements-dev.lock b/requirements-dev.lock
deleted file mode 100644
index 8f23096..0000000
--- a/requirements-dev.lock
+++ /dev/null
@@ -1,10 +0,0 @@
-# generated by rye
-# use `rye lock` or `rye sync` to update this lockfile
-#
-# last locked with the following flags:
-#   pre: false
-#   features: []
-#   all-features: false
-#   with-sources: false
-
--e file:.
diff --git a/requirements.lock b/requirements.lock
deleted file mode 100644
index 8f23096..0000000
--- a/requirements.lock
+++ /dev/null
@@ -1,10 +0,0 @@
-# generated by rye
-# use `rye lock` or `rye sync` to update this lockfile
-#
-# last locked with the following flags:
-#   pre: false
-#   features: []
-#   all-features: false
-#   with-sources: false
-
--e file:.
diff --git a/src/logbesselk/jax/ica.py b/src/logbesselk/jax/ica.py
index 3fdfe06..a0f5652 100644
--- a/src/logbesselk/jax/ica.py
+++ b/src/logbesselk/jax/ica.py
@@ -32,9 +32,6 @@ def log_bessel_k(v, x):
     Combination of Integrate, Continued fraction and Asymptotic expansion.
     """
 
-    def small_x_case():
-        return log_k_small_x(v, x)
-
     def large_x_case():
         def small_v_case():
             n = fround(v)
@@ -47,17 +44,15 @@ def large_v_case():
             v_ = lax.cond(large_v, lambda: v.astype(dtype), lambda: dtype(0))
             return log_k_large_v(v_, x)
 
+        dtype = result_type(v, x)
+        large_v_ = v >= 25
+        small_v = finite & ~large_v_
+        large_v = finite & large_v_
         return lax.cond(small_v, small_v_case, large_v_case)
 
-    dtype = result_type(v, x)
-    finite = is_finite(v) & is_finite(x) & (x > 0)
-    large_v_ = v >= 25
-    large_x_ = x >= 100
-
-    small_x = finite & ~large_x_
-    small_v = finite & large_x_ & ~large_v_
-    large_v = finite & large_x_ & large_v_
-    return lax.cond(small_x, small_x_case, large_x_case)
+    out = log_k_small_x(v, x)
+    finite = is_finite(out)
+    return lax.cond(finite, lambda: out, large_x_case)
 
 
 def bessel_kratio(v, x, d=1):