diff --git a/pyproject.toml b/pyproject.toml
index 0f3446668..4cbc071d8 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -26,7 +26,7 @@ opentelemetry = [
 ]
 pydantic = ["pydantic>=2.0.0,<3"]
 openai-agents = [
-    "openai-agents>=0.2.11,<0.3",
+    "openai-agents>=0.3,<0.4",
     "eval-type-backport>=0.2.2; python_version < '3.10'"
 ]
 
@@ -57,7 +57,7 @@ dev = [
     "pytest-cov>=6.1.1",
     "httpx>=0.28.1",
     "pytest-pretty>=1.3.0",
-    "openai-agents[litellm]>=0.2.11,<0.3"
+    "openai-agents[litellm]>=0.3,<0.4"
 ]
 
 [tool.poe.tasks]
diff --git a/temporalio/contrib/openai_agents/_invoke_model_activity.py b/temporalio/contrib/openai_agents/_invoke_model_activity.py
index b0ba8ef7d..6409f0bb1 100644
--- a/temporalio/contrib/openai_agents/_invoke_model_activity.py
+++ b/temporalio/contrib/openai_agents/_invoke_model_activity.py
@@ -173,11 +173,6 @@ async def empty_on_invoke_handoff(
         ) -> Any:
             return None
 
-        # workaround for https://github.com/pydantic/pydantic/issues/9541
-        # ValidatorIterator returned
-        input_json = to_json(input["input"])
-        input_input = json.loads(input_json)
-
         def make_tool(tool: ToolInput) -> Tool:
             if isinstance(
                 tool,
@@ -220,7 +215,7 @@ def make_tool(tool: ToolInput) -> Tool:
         try:
             return await model.get_response(
                 system_instructions=input.get("system_instructions"),
-                input=input_input,
+                input=input["input"],
                 model_settings=input["model_settings"],
                 tools=tools,
                 output_schema=input.get("output_schema"),
diff --git a/temporalio/contrib/openai_agents/_openai_runner.py b/temporalio/contrib/openai_agents/_openai_runner.py
index 4f9dbbf65..f7030cdd4 100644
--- a/temporalio/contrib/openai_agents/_openai_runner.py
+++ b/temporalio/contrib/openai_agents/_openai_runner.py
@@ -63,11 +63,6 @@ async def run(
                 "Temporal OpenAI agent does not support on demand MCP servers."
             )
 
-        # workaround for https://github.com/pydantic/pydantic/issues/9541
-        # ValidatorIterator returned
-        input_json = to_json(input)
-        input = json.loads(input_json)
-
         context = kwargs.get("context")
         max_turns = kwargs.get("max_turns", DEFAULT_MAX_TURNS)
         hooks = kwargs.get("hooks")
diff --git a/uv.lock b/uv.lock
index fbf2f9470..d6e59a30e 100644
--- a/uv.lock
+++ b/uv.lock
@@ -1720,7 +1720,7 @@ wheels = [
 
 [[package]]
 name = "openai"
-version = "1.107.0"
+version = "1.107.1"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "anyio" },
@@ -1732,14 +1732,14 @@ dependencies = [
     { name = "tqdm" },
     { name = "typing-extensions" },
 ]
-sdist = { url = "https://files.pythonhosted.org/packages/88/67/d6498de300f83ff57a79cb7aa96ef3bef8d6f070c3ded0f1b5b45442a6bc/openai-1.107.0.tar.gz", hash = "sha256:43e04927584e57d0e9e640ee0077c78baf8150098be96ebd5c512539b6c4e9a4", size = 566056, upload-time = "2025-09-08T19:25:47.604Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/f3/e0/a62daa7ff769df969cc1b782852cace79615039630b297005356f5fb46fb/openai-1.107.1.tar.gz", hash = "sha256:7c51b6b8adadfcf5cada08a613423575258b180af5ad4bc2954b36ebc0d3ad48", size = 563671, upload-time = "2025-09-10T15:04:40.288Z" }
 wheels = [
-    { url = "https://files.pythonhosted.org/packages/91/ed/e8a4fd20390f2858b95227c288df8fe0c835f7c77625f7583609161684ba/openai-1.107.0-py3-none-any.whl", hash = "sha256:3dcfa3cbb116bd6924b27913b8da28c4a787379ff60049588547a1013e6d6438", size = 950968, upload-time = "2025-09-08T19:25:45.552Z" },
+    { url = "https://files.pythonhosted.org/packages/d4/12/32c19999a58eec4a695e8ce334442b6135df949f0bb61b2ceaa4fa60d3a9/openai-1.107.1-py3-none-any.whl", hash = "sha256:168f9885b1b70d13ada0868a0d0adfd538c16a02f7fd9fe063851a2c9a025e72", size = 945177, upload-time = "2025-09-10T15:04:37.782Z" },
 ]
 
 [[package]]
 name = "openai-agents"
-version = "0.2.11"
+version = "0.3.0"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "griffe" },
@@ -1750,9 +1750,9 @@ dependencies = [
     { name = "types-requests" },
     { name = "typing-extensions" },
 ]
-sdist = { url = "https://files.pythonhosted.org/packages/dd/c7/e8b588851bdbb33f16397b45d182998a01e6e57ff028a143788036a89d53/openai_agents-0.2.11.tar.gz", hash = "sha256:1a2e3fade02b3d8571560dbd121bfe0d84c80f48da04c838d9d5195966714abc", size = 1677542, upload-time = "2025-09-03T22:16:05.856Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/a3/49/78c902865ceb0432dae52f4a3feee8bcb57ce5be724c52e0119754fd421b/openai_agents-0.3.0.tar.gz", hash = "sha256:4d5d1a4f43cdc35b55c41ae4f31157cf5ff2e2c89563cde58616f8a77fde932d", size = 1700443, upload-time = "2025-09-11T19:20:09.742Z" }
 wheels = [
-    { url = "https://files.pythonhosted.org/packages/6a/71/a8712a89502b95da64db6b0b31c12ac5039542ae8e31caddba369b6bd324/openai_agents-0.2.11-py3-none-any.whl", hash = "sha256:ed26f7bb2b08bd7607ae87eb7bcfcee8c8f4431da134252757b31120a68b9086", size = 179141, upload-time = "2025-09-03T22:16:03.823Z" },
+    { url = "https://files.pythonhosted.org/packages/46/3b/58ee42582716645aa1a5c30c1e337dc9a7433f7f0b5ed84ef02a35368abb/openai_agents-0.3.0-py3-none-any.whl", hash = "sha256:16de8a28729ae9e27faad7ce146a4b74acf05c9eeca3fe23299f6e621a3893ed", size = 185007, upload-time = "2025-09-11T19:20:08.304Z" },
 ]
 
 [package.optional-dependencies]
@@ -2847,7 +2847,7 @@ requires-dist = [
     { name = "eval-type-backport", marker = "python_full_version < '3.10' and extra == 'openai-agents'", specifier = ">=0.2.2" },
     { name = "grpcio", marker = "extra == 'grpc'", specifier = ">=1.48.2,<2" },
     { name = "nexus-rpc", specifier = "==1.1.0" },
-    { name = "openai-agents", marker = "extra == 'openai-agents'", specifier = ">=0.2.11,<0.3" },
+    { name = "openai-agents", marker = "extra == 'openai-agents'", specifier = ">=0.3,<0.4" },
     { name = "opentelemetry-api", marker = "extra == 'opentelemetry'", specifier = ">=1.11.1,<2" },
     { name = "opentelemetry-sdk", marker = "extra == 'opentelemetry'", specifier = ">=1.11.1,<2" },
     { name = "protobuf", specifier = ">=3.20,<6" },
@@ -2866,7 +2866,7 @@ dev = [
     { name = "maturin", specifier = ">=1.8.2" },
     { name = "mypy", specifier = "==1.4.1" },
     { name = "mypy-protobuf", specifier = ">=3.3.0,<4" },
-    { name = "openai-agents", extras = ["litellm"], specifier = ">=0.2.11,<0.3" },
+    { name = "openai-agents", extras = ["litellm"], specifier = ">=0.3,<0.4" },
     { name = "psutil", specifier = ">=5.9.3,<6" },
     { name = "pydocstyle", specifier = ">=6.3.0,<7" },
     { name = "pydoctor", specifier = ">=24.11.1,<25" },