diff --git a/thousandeyes-sdk-core/pyproject.toml b/thousandeyes-sdk-core/pyproject.toml
index a40bd17c..fd54435e 100644
--- a/thousandeyes-sdk-core/pyproject.toml
+++ b/thousandeyes-sdk-core/pyproject.toml
@@ -9,7 +9,7 @@ description = "ThousandEyes SDK Core"
 license = { file = "LICENSE" }
 requires-python = ">= 3.8"
 dependencies = [
-    "urllib3 >= 2.0.0",
+    "urllib3 >= 2.6.3",
     "python-dateutil >=2.8.2",
     "pydantic >=2.1.0",
     "typing-extensions >=4.7.1",
diff --git a/thousandeyes-sdk-core/test/test_thousandeyes_retry.py b/thousandeyes-sdk-core/test/test_thousandeyes_retry.py
index 944e5dd6..a3e460ff 100644
--- a/thousandeyes-sdk-core/test/test_thousandeyes_retry.py
+++ b/thousandeyes-sdk-core/test/test_thousandeyes_retry.py
@@ -41,3 +41,19 @@ def test_parse_reset_header_invalid():
     retry = ThousandEyesRetry()
     assert retry._parse_reset_header("invalid") is None
     assert retry._parse_reset_header(None) is None
+
+
+def test_retry_new_clones_with_retry_after_max():
+    retry = ThousandEyesRetry(retry_after_max=3600)
+    cloned = retry.new()
+    assert isinstance(cloned, ThousandEyesRetry)
+    assert cloned.retry_after_max == 3600
+
+
+def test_retry_increment_on_429():
+    response = Mock(spec=HTTPResponse)
+    response.status = 429
+    response.headers = {"Retry-After": "0"}
+    retry = ThousandEyesRetry(total=1)
+    new_retry = retry.increment(method="GET", url="/test", response=response)
+    assert isinstance(new_retry, ThousandEyesRetry)