diff --git a/.github/workflows/unit-tests.yaml b/.github/workflows/unit-tests.yaml
index 5d14e5a2..3bdb49da 100644
--- a/.github/workflows/unit-tests.yaml
+++ b/.github/workflows/unit-tests.yaml
@@ -12,7 +12,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ['3.8', '3.9', '3.10', '3.11', '3.12']
+        python-version: ['3.9', '3.10', '3.11', '3.12']
     steps:
     - uses: actions/checkout@v2
 
diff --git a/poetry.lock b/poetry.lock
index de0b4598..f04ff8a1 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -232,9 +232,6 @@ files = [
     {file = "babel-2.16.0.tar.gz", hash = "sha256:d1f3554ca26605fe173f3de0c65f750f5a42f924499bf134de6423582298e316"},
 ]
 
-[package.dependencies]
-pytz = {version = ">=2015.7", markers = "python_version < \"3.9\""}
-
 [package.extras]
 dev = ["freezegun (>=1.0,<2.0)", "pytest (>=6.0)", "pytest-cov"]
 
@@ -1591,11 +1588,9 @@ files = [
 attrs = ">=22.2.0"
 fqdn = {version = "*", optional = true, markers = "extra == \"format-nongpl\""}
 idna = {version = "*", optional = true, markers = "extra == \"format-nongpl\""}
-importlib-resources = {version = ">=1.4.0", markers = "python_version < \"3.9\""}
 isoduration = {version = "*", optional = true, markers = "extra == \"format-nongpl\""}
 jsonpointer = {version = ">1.13", optional = true, markers = "extra == \"format-nongpl\""}
 jsonschema-specifications = ">=2023.03.6"
-pkgutil-resolve-name = {version = ">=1.3.10", markers = "python_version < \"3.9\""}
 referencing = ">=0.28.4"
 rfc3339-validator = {version = "*", optional = true, markers = "extra == \"format-nongpl\""}
 rfc3986-validator = {version = ">0.1.0", optional = true, markers = "extra == \"format-nongpl\""}
@@ -1619,7 +1614,6 @@ files = [
 ]
 
 [package.dependencies]
-importlib-resources = {version = ">=1.4.0", markers = "python_version < \"3.9\""}
 referencing = ">=0.31.0"
 
 [[package]]
@@ -1818,7 +1812,6 @@ files = [
 async-lru = ">=1.0.0"
 httpx = ">=0.25.0"
 importlib-metadata = {version = ">=4.8.3", markers = "python_version < \"3.10\""}
-importlib-resources = {version = ">=1.4", markers = "python_version < \"3.9\""}
 ipykernel = ">=6.5.0"
 jinja2 = ">=3.0.3"
 jupyter-core = "*"
@@ -2041,7 +2034,6 @@ files = [
 
 [package.dependencies]
 astropy = "*"
-importlib-resources = {version = ">=1.3.0", markers = "python_version < \"3.9\""}
 ligo-segments = "*"
 lscsoft-glue = "*"
 matplotlib = "*"
@@ -2779,8 +2771,8 @@ files = [
 [package.dependencies]
 numpy = [
     {version = ">=1.20.3", markers = "python_version < \"3.10\""},
-    {version = ">=1.21.0", markers = "python_version >= \"3.10\" and python_version < \"3.11\""},
     {version = ">=1.23.2", markers = "python_version >= \"3.11\""},
+    {version = ">=1.21.0", markers = "python_version >= \"3.10\" and python_version < \"3.11\""},
 ]
 python-dateutil = ">=2.8.2"
 pytz = ">=2020.1"
@@ -2957,17 +2949,6 @@ tests = ["check-manifest", "coverage", "defusedxml", "markdown2", "olefile", "pa
 typing = ["typing-extensions"]
 xmp = ["defusedxml"]
 
-[[package]]
-name = "pkgutil-resolve-name"
-version = "1.3.10"
-description = "Resolve a name to an object."
-optional = false
-python-versions = ">=3.6"
-files = [
-    {file = "pkgutil_resolve_name-1.3.10-py3-none-any.whl", hash = "sha256:ca27cc078d25c5ad71a9de0a7a330146c4e014c2462d9af19c6b828280649c5e"},
-    {file = "pkgutil_resolve_name-1.3.10.tar.gz", hash = "sha256:357d6c9e6a755653cfd78893817c0853af365dd51ec97f3d358a819373bbd174"},
-]
-
 [[package]]
 name = "platformdirs"
 version = "4.3.6"
@@ -4038,20 +4019,6 @@ pure-eval = "*"
 [package.extras]
 tests = ["cython", "littleutils", "pygments", "pytest", "typeguard"]
 
-[[package]]
-name = "sympy"
-version = "1.12.1"
-description = "Computer algebra system (CAS) in Python"
-optional = false
-python-versions = ">=3.8"
-files = [
-    {file = "sympy-1.12.1-py3-none-any.whl", hash = "sha256:9b2cbc7f1a640289430e13d2a56f02f867a1da0190f2f99d8968c2f74da0e515"},
-    {file = "sympy-1.12.1.tar.gz", hash = "sha256:2877b03f998cd8c08f07cd0de5b767119cd3ef40d09f41c30d722f6686b0fb88"},
-]
-
-[package.dependencies]
-mpmath = ">=1.1.0,<1.4.0"
-
 [[package]]
 name = "sympy"
 version = "1.13.1"
@@ -4193,10 +4160,7 @@ nvidia-nccl-cu12 = {version = "2.21.5", markers = "platform_system == \"Linux\"
 nvidia-nvjitlink-cu12 = {version = "12.4.127", markers = "platform_system == \"Linux\" and platform_machine == \"x86_64\""}
 nvidia-nvtx-cu12 = {version = "12.4.127", markers = "platform_system == \"Linux\" and platform_machine == \"x86_64\""}
 setuptools = {version = "*", markers = "python_version >= \"3.12\""}
-sympy = [
-    {version = "1.12.1", markers = "python_version == \"3.8\""},
-    {version = "1.13.1", markers = "python_version >= \"3.9\""},
-]
+sympy = {version = "1.13.1", markers = "python_version >= \"3.9\""}
 triton = {version = "3.1.0", markers = "platform_system == \"Linux\" and platform_machine == \"x86_64\" and python_version < \"3.13\""}
 typing-extensions = ">=4.8.0"
 
@@ -4498,5 +4462,5 @@ type = ["pytest-mypy"]
 
 [metadata]
 lock-version = "2.0"
-python-versions = "^3.8,<3.13"
-content-hash = "8a0cdbf2548734631da9fa8949f6fd55318868aa31dbe1d1f6168bc12de2d130"
+python-versions = "^3.9,<3.13"
+content-hash = "f0b02e64259742463c71d6bb9fd51f2a0e0221e63bb4a6851d3852b1dcc48939"
diff --git a/pyproject.toml b/pyproject.toml
index 15c216bc..4a43659f 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "ml4gw"
-version = "0.6.2"
+version = "0.6.3"
 description = "Tools for training torch models on gravitational wave data"
 readme = "README.md"
 authors = [
@@ -8,7 +8,7 @@ authors = [
 ]
 
 [tool.poetry.dependencies]
-python = "^3.8,<3.13"
+python = "^3.9,<3.13"
 
 jaxtyping = "^0.2"
 
@@ -59,18 +59,17 @@ include_trailing_comma = true
 [tool.tox]
 legacy_tox_ini = """
 [tox]
-envlist = py{38,39,310,311,312}
+envlist = py{39,310,311,312}
 isolated_build = true
 
 [gh-actions]
 python =
-    3.8: py38
     3.9: py39
     3.10: py310
     3.11: py311
     3.12: py312
 
-[testenv:py{38,39,310,311,312}]
+[testenv:py{39,310,311,312}]
 deps = 
     pytest>=7,<8
     lalsuite>=7,<8
diff --git a/tests/waveforms/cbc/test_cbc_waveforms.py b/tests/waveforms/cbc/test_cbc_waveforms.py
index 50774870..b4b628e4 100644
--- a/tests/waveforms/cbc/test_cbc_waveforms.py
+++ b/tests/waveforms/cbc/test_cbc_waveforms.py
@@ -72,19 +72,19 @@ def phi_jl(request):
 
 @pytest.fixture()
 def distance(request):
-    dist = Uniform(100, 300)
+    dist = Uniform(100, 3000)
     return dist.sample((N_SAMPLES,))
 
 
 @pytest.fixture()
 def distance_far(request):
-    dist = Uniform(300, 3000)
+    dist = Uniform(400, 3000)
     return dist.sample((N_SAMPLES,))
 
 
 @pytest.fixture()
 def distance_close(request):
-    dist = Uniform(100, 300)
+    dist = Uniform(100, 400)
     return dist.sample((N_SAMPLES,))
 
 
@@ -386,7 +386,7 @@ def test_phenom_p(
     # compare each waveform with lalsimulation
     for i in range(len(chirp_mass)):
 
-        # test far (> 300 Mpc) waveforms (O(1e-3) agreement)
+        # test far (> 400 Mpc) waveforms (O(1e-3) agreement)
 
         # construct lalinference params
         params = dict(
@@ -465,7 +465,7 @@ def test_phenom_p(
             1e21 * hc_lal_data.imag, 1e21 * hc_ml4gw.imag.numpy(), atol=1e-3
         )
 
-        # test close (< 300 Mpc) waveforms  (O(1e-2) agreement)
+        # test close (< 400 Mpc) waveforms  (O(1e-2) agreement)
         params["distance"] = (distance_close[i].item() * u.Mpc).to("m").value
         hp_lal, hc_lal = lalsimulation.SimInspiralChooseFDWaveform(**params)