diff --git a/pyproject.toml b/pyproject.toml
index 5b9d9b0..83302bd 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -11,7 +11,7 @@ keywords = ["FactSet", "API", "SDK"]
 dependencies = [
   "requests-oauthlib>=2.0.0,<3",
   "requests>=2.34.2,<3",
-  "oauthlib>=3.2.2,<4",
+  "oauthlib>=3.2.2,<5",
   "joserfc>=1.7.5,<2.0",
 ]
 
diff --git a/uv.lock b/uv.lock
index 4789824..625fe85 100644
--- a/uv.lock
+++ b/uv.lock
@@ -417,7 +417,7 @@ dev = [
 [package.metadata]
 requires-dist = [
     { name = "joserfc", specifier = ">=1.7.5,<2.0" },
-    { name = "oauthlib", specifier = ">=3.2.2,<4" },
+    { name = "oauthlib", specifier = ">=3.2.2,<5" },
     { name = "requests", specifier = ">=2.34.2,<3" },
     { name = "requests-oauthlib", specifier = ">=2.0.0,<3" },
 ]
@@ -472,11 +472,11 @@ wheels = [
 
 [[package]]
 name = "oauthlib"
-version = "3.3.1"
+version = "4.0.0"
 source = { registry = "https://pypi.org/simple" }
-sdist = { url = "https://files.pythonhosted.org/packages/0b/5f/19930f824ffeb0ad4372da4812c50edbd1434f678c90c2733e1188edfc63/oauthlib-3.3.1.tar.gz", hash = "sha256:0f0f8aa759826a193cf66c12ea1af1637f87b9b4622d46e866952bb022e538c9", size = 185918, upload-time = "2025-06-19T22:48:08.269Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/7a/d8/a1bcc8ba112a627f8ffbdc212a78ce18d3ac07e91a5ca65d27918eee25a1/oauthlib-4.0.0.tar.gz", hash = "sha256:efb274799819440f95b4ab3b818869f1ce9ae26c5beacba0201d1a1b76b54f86", size = 187232, upload-time = "2026-09-28T06:01:18.77Z" }
 wheels = [
-    { url = "https://files.pythonhosted.org/packages/be/9c/92789c596b8df838baa98fa71844d84283302f7604ed565dafe5a6b5041a/oauthlib-3.3.1-py3-none-any.whl", hash = "sha256:88119c938d2b8fb88561af5f6ee0eec8cc8d552b7bb1f712743136eb7523b7a1", size = 160065, upload-time = "2025-06-19T22:48:06.508Z" },
+    { url = "https://files.pythonhosted.org/packages/d9/f4/78229a1066068ca14fc60fb26cf7381cabe4382261392b90e5f9552722d4/oauthlib-4.0.0-py3-none-any.whl", hash = "sha256:624c28c13a0a59cabf9747dfa52af63be3e512a7f2714df16e91b5b3a145e6cd", size = 159715, upload-time = "2026-09-28T06:01:17.008Z" },
 ]
 
 [[package]]