diff --git a/gptscript/opts.py b/gptscript/opts.py
index 468cdee..71b7831 100644
--- a/gptscript/opts.py
+++ b/gptscript/opts.py
@@ -30,6 +30,7 @@ def __init__(self,
                  chatState: str = "",
                  confirm: bool = False,
                  prompt: bool = False,
+                 credentialOverride: str = "",
                  env: list[str] = None,
                  apiKey: str = "",
                  baseURL: str = "",
@@ -43,4 +44,5 @@ def __init__(self,
         self.chatState = chatState
         self.confirm = confirm
         self.prompt = prompt
+        self.credentialOverride = credentialOverride
         self.env = env
diff --git a/tests/fixtures/credential-override.gpt b/tests/fixtures/credential-override.gpt
new file mode 100644
index 0000000..6211989
--- /dev/null
+++ b/tests/fixtures/credential-override.gpt
@@ -0,0 +1,5 @@
+credentials: github.com/gptscript-ai/credential as test.ts.credential_override with TEST_CRED as env
+
+#!/usr/bin/env bash
+
+echo "${TEST_CRED}"
diff --git a/tests/test_gptscript.py b/tests/test_gptscript.py
index 6e2c062..1469d49 100644
--- a/tests/test_gptscript.py
+++ b/tests/test_gptscript.py
@@ -183,6 +183,16 @@ async def collect_events(run: Run, e: CallFrame | RunFrame | PromptFrame):
     assert "Ronald Reagan" in await run.text(), "Expect streaming file to have correct output"
     assert "Ronald Reagan" in stream_output, "Expect stream_output to have correct output when streaming from file"
 
+@pytest.mark.asyncio
+async def test_credential_override(gptscript):
+    run = gptscript.run(
+        "./tests/fixtures/credential-override.gpt", 
+        Options(
+            disableCache=True,
+            credentialOverride='test.ts.credential_override:TEST_CRED=foo'
+        ),
+    )
+    assert "foo" in await run.text(), "Expect credential override to have correct output"
 
 @pytest.mark.asyncio
 async def test_eval_with_context(gptscript):