diff --git a/campus_cli/auth/client.py b/campus_cli/auth/client.py
index 4e9ca9f..0ca5b99 100644
--- a/campus_cli/auth/client.py
+++ b/campus_cli/auth/client.py
@@ -241,16 +241,28 @@ def client_update(
     description: str | None = typer.Option(
         None, "--description", "-d", help="New client description"
     ),
+    redirect_uri: list[str] = typer.Option(  # noqa: B008
+        [],
+        "--redirect-uri",
+        help="OAuth redirect URI (repeat for multiple; REPLACES the existing"
+        " list, so re-pass the full list when adding one)",
+    ),
     output_json: bool = typer.Option(False, "--json", help="Output as JSON"),
     dry_run: bool = dry_run_option(),
 ) -> None:
     """
     Update an OAuth client.
 
-    Updates the name and/or description of an existing client.
+    Updates the name, description and/or redirect URIs of an existing
+    client. --redirect-uri replaces the whole redirect URI list: the
+    authorization endpoint will require an exact match (RFC 6749
+    §3.1.2.2), so re-pass every URI the client must keep.
     """
-    if not name and not description:
-        print_error("At least one of --name or --description must be provided.")
+    if not name and not description and not redirect_uri:
+        print_error(
+            "At least one of --name, --description or --redirect-uri "
+            "must be provided."
+        )
         raise typer.Exit(1)
 
     if dry_run:
@@ -259,6 +271,8 @@ def client_update(
             update_kwargs.append(f"name={name!r}")
         if description:
             update_kwargs.append(f"description={description!r}")
+        if redirect_uri:
+            update_kwargs.append(f"redirect_uris={list(redirect_uri)!r}")
         print_python_api(
             "campus client update",
             [
@@ -272,7 +286,14 @@ def client_update(
 
     try:
         api = get_api_client()
-        client = api.auth_clients[client_id].update(name=name, description=description)
+        update_kwargs: dict = {}
+        if name:
+            update_kwargs["name"] = name
+        if description:
+            update_kwargs["description"] = description
+        if redirect_uri:
+            update_kwargs["redirect_uris"] = list(redirect_uri)
+        client = api.auth_clients[client_id].update(**update_kwargs)
 
         result = _format_client(client)
 
diff --git a/docs/PRD.md b/docs/PRD.md
index 1d2e508..1478249 100644
--- a/docs/PRD.md
+++ b/docs/PRD.md
@@ -3,7 +3,7 @@
 ## Project: campus-cli
 
 ### Overview
-A command-line interface tool for interacting with the Campus API, enabling users to perform authentication and vault operations directly from the shell.
+A command-line interface tool for interacting with the Campus API, enabling users to perform authentication, OAuth client management, and vault operations directly from the shell.
 
 ### Core Features
 
@@ -12,23 +12,27 @@ A command-line interface tool for interacting with the Campus API, enabling user
 - `campus auth logout` - Clear stored credentials
 
 #### 2. OAuth Client Management
-- `campus auth client new --name <name> --description <descr>` - Create new OAuth client
-- `campus auth client get --client-id <client_id>` - Get client details
-- `campus auth client delete --client-id <client_id>` - Delete a client
-- `campus auth client revoke --client-id <client_id>` - Revoke client access
-- `campus auth client update --client-id <client_id> [--name <name>] [--description <descr>]` - Update client metadata
+- `campus client list` - List all OAuth clients
+- `campus client new --name <name> --description <descr> [--public] [--redirect-uri <uri>]` - Create new OAuth client
+- `campus client get --client-id <client_id>` - Get client details
+- `campus client delete --client-id <client_id>` - Delete a client
+- `campus client revoke --client-id <client_id>` - Generate a new client secret (the only time it is displayed)
+- `campus client update --client-id <client_id> [--name <name>] [--description <descr>] [--redirect-uri <uri>]` - Update client metadata or replace redirect URIs
 
 #### 3. Client Access Management
-- `campus auth client access get --client-id <client_id>` - Get access permissions
-- `campus auth client access grant --client-id <client_id>` - Grant access
-- `campus auth client access revoke --client-id <client_id>` - Revoke access
-- `campus auth client access update --client-id <client_id>` - Update access
+- `campus client access get --client-id <client_id> [--vault <label>]` - Get access permissions
+- `campus client access grant --client-id <client_id> --vault <label> --permission <bitflag>` - Grant vault access (1=READ, 2=CREATE, 4=UPDATE, 8=DELETE)
+- `campus client access revoke --client-id <client_id> --vault <label> --permission <bitflag>` - Revoke vault access
+- `campus client access update --client-id <client_id> --vault <label> --permission <bitflag>` - Set (replace) a vault's access level
 
 #### 4. Vault Management
-- `campus auth vault list --vault <label>` - List all entries in a vault
-- `campus auth vault get --vault <label>` - Get entire vault
-- `campus auth vault get --vault <label> --key <key>` - Get specific key from vault
-- `campus auth vault set --vault <label> --key <key> --value <value>` - Set key-value in vault
+- `campus vault list --vault <label>` - List all entries in a vault
+- `campus vault get --vault <label> [--key <key>]` - Get a specific key, or the whole vault if --key is omitted
+- `campus vault set --vault <label> --key <key> --value <value>` - Set key-value in vault
+- `campus vault delete --vault <label> --key <key>` - Delete a key from the vault
+
+All `client` and `vault` commands accept `--dry-run`, which prints the
+equivalent `campus_python` code without authenticating or calling the API.
 
 ### Non-Functional Requirements
 
diff --git a/poetry.lock b/poetry.lock
index ef3c30b..2158b3e 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -163,7 +163,7 @@ flask = "^3.0.0"
 type = "git"
 url = "https://github.com/nyjc-computing/campus-api-python.git"
 reference = "main"
-resolved_reference = "d2fba82f2169e5f67a1e16158f3bcba674749c9f"
+resolved_reference = "7e0b4505a8be02be5e2a8317ce9d0ca28e2a4a7f"
 
 [[package]]
 name = "campus-suite"
diff --git a/tests/integration/test_client_update.py b/tests/integration/test_client_update.py
new file mode 100644
index 0000000..0d06468
--- /dev/null
+++ b/tests/integration/test_client_update.py
@@ -0,0 +1,74 @@
+"""Integration tests for `campus client update` field handling (issue #15).
+
+The command must forward only the fields the admin passed — including
+--redirect-uri, which the API layer replaces wholesale — and reject a
+call that would update nothing.
+"""
+
+from types import SimpleNamespace
+from unittest.mock import MagicMock, patch
+
+from typer.testing import CliRunner
+
+from campus_cli.cli import app
+
+runner = CliRunner()
+
+
+def _updated_client(**overrides):
+    """A client model as the API layer would return after an update."""
+    fields = {
+        "id": "uid-x",
+        "name": "New Name",
+        "description": "Updated description",
+        "created_at": "2026-09-30T06:31:24+00:00",
+        "permissions": {"campus.api": 1},
+    }
+    fields.update(overrides)
+    return SimpleNamespace(**fields)
+
+
+def _invoke_update(args):
+    """Run `campus client update` against a mocked API client."""
+    api = MagicMock()
+    api.auth_clients["uid-x"].update.return_value = _updated_client()
+    with patch("campus_cli.auth.client.get_api_client", return_value=api):
+        result = runner.invoke(app, ["client", "update", *args])
+    return result, api
+
+
+def test_update_requires_at_least_one_field():
+    """With no field options, the command errors and calls nothing."""
+    result, api = _invoke_update(["--client-id", "uid-x"])
+
+    assert result.exit_code == 1
+    assert "At least one of" in result.stderr
+    api.auth_clients["uid-x"].update.assert_not_called()
+
+
+def test_update_passes_redirect_uris_through():
+    """--redirect-uri is forwarded as redirect_uris in given order."""
+    result, api = _invoke_update([
+        "--client-id", "uid-x",
+        "--redirect-uri", "https://a/cb",
+        "--redirect-uri", "http://localhost:8000/cb",
+    ])
+
+    assert result.exit_code == 0
+    api.auth_clients["uid-x"].update.assert_called_once_with(
+        redirect_uris=["https://a/cb", "http://localhost:8000/cb"]
+    )
+
+
+def test_update_combines_name_and_redirect_uris():
+    """Multiple fields are forwarded together; absent ones are omitted."""
+    result, api = _invoke_update([
+        "--client-id", "uid-x",
+        "--name", "New Name",
+        "--redirect-uri", "https://a/cb",
+    ])
+
+    assert result.exit_code == 0
+    api.auth_clients["uid-x"].update.assert_called_once_with(
+        name="New Name", redirect_uris=["https://a/cb"]
+    )
diff --git a/tests/integration/test_dry_run.py b/tests/integration/test_dry_run.py
index 1563eb7..f6406ee 100644
--- a/tests/integration/test_dry_run.py
+++ b/tests/integration/test_dry_run.py
@@ -86,6 +86,26 @@ def test_client_update_dry_run_only_passed_fields():
     assert "description=" not in result.stdout
 
 
+def test_client_update_dry_run_redirect_uris():
+    """client update --dry-run passes redirect_uris only when given."""
+    result = _invoke_dry_run(
+        "client", "update", "--client-id", "uid-x",
+        "--redirect-uri", "https://a/cb",
+        "--redirect-uri", "http://localhost:8000/cb",
+    )
+
+    assert "campus.auth.clients['uid-x'].update(" in result.stdout
+    assert (
+        "redirect_uris=['https://a/cb', 'http://localhost:8000/cb']"
+        in result.stdout
+    )
+
+    plain = _invoke_dry_run(
+        "client", "update", "--client-id", "uid-x", "--name", "N"
+    )
+    assert "redirect_uris" not in plain.stdout
+
+
 def test_client_delete_dry_run_skips_confirmation():
     """client delete --dry-run shows the delete call without prompting."""
     result = _invoke_dry_run("client", "delete", "--client-id", "uid-x")