diff --git a/CHANGELOG.md b/CHANGELOG.md
index dbf2b6984..511e4aede 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,9 @@
 ENHANCEMENTS:
 * Update UI dependencies: `brace-expansion` to 1.1.18, `fast-uri` to 3.1.5, `immutable` to 5.1.9, `js-yaml` to 4.3.1, `nanoid` to 3.3.18, and `postcss` to 8.5.26. ([#5056](https://github.com/microsoft/AzureTRE/pull/5056))
 
+BUG FIXES:
+* Configure the default pytest-asyncio fixture loop scope to `function` to remove the deprecation warning. ([#5055](https://github.com/microsoft/AzureTRE/pull/5055))
+
 ## (0.29.0) (August 14, 2026)
 **BREAKING CHANGES**
 * Remove Windows 10 and dsvm image support from Guacamole. ([#4890](https://github.com/microsoft/AzureTRE/issues/4890))
diff --git a/api_app/_version.py b/api_app/_version.py
index ae62eb632..1932d0ba3 100644
--- a/api_app/_version.py
+++ b/api_app/_version.py
@@ -1 +1 @@
-__version__ = "0.26.5"
+__version__ = "0.26.6"
diff --git a/api_app/pytest.ini b/api_app/pytest.ini
index 9e90ef7cb..a86e89e4b 100644
--- a/api_app/pytest.ini
+++ b/api_app/pytest.ini
@@ -1,3 +1,5 @@
 [pytest]
 filterwarnings =
     error
+asyncio_mode = strict
+asyncio_default_fixture_loop_scope = function
diff --git a/api_app/tests_ma/test_api/conftest.py b/api_app/tests_ma/test_api/conftest.py
index 7ad45f341..35fef90a5 100644
--- a/api_app/tests_ma/test_api/conftest.py
+++ b/api_app/tests_ma/test_api/conftest.py
@@ -144,7 +144,7 @@ def inner():
     return inner
 
 
-@pytest_asyncio.fixture(scope='module')
+@pytest.fixture(scope='module')
 def app() -> FastAPI:
     from main import get_application
 
diff --git a/api_app/tests_ma/test_api/test_routes/test_airlock.py b/api_app/tests_ma/test_api/test_routes/test_airlock.py
index 7d8f29576..842aec038 100644
--- a/api_app/tests_ma/test_api/test_routes/test_airlock.py
+++ b/api_app/tests_ma/test_api/test_routes/test_airlock.py
@@ -1,6 +1,5 @@
 import time
 import pytest
-import pytest_asyncio
 from mock import patch
 from fastapi import status
 from azure.core.exceptions import HttpResponseError
@@ -129,7 +128,7 @@ def inner():
 
 
 class TestAirlockRoutesThatRequireOwnerOrResearcherRights():
-    @pytest_asyncio.fixture(autouse=True, scope='class')
+    @pytest.fixture(autouse=True, scope='class')
     def log_in_with_researcher_user(self, app, researcher_user):
         app.dependency_overrides[require_workspace_owner_or_researcher] = researcher_user
         app.dependency_overrides[require_workspace_owner_or_researcher_or_airlock_manager] = researcher_user
@@ -305,7 +304,7 @@ async def test_get_airlock_container_link_returned_as_expected(self, get_airlock
 
 
 class TestAirlockRoutesThatRequireAirlockManagerRights():
-    @pytest_asyncio.fixture(autouse=True, scope='class')
+    @pytest.fixture(autouse=True, scope='class')
     def log_in_with_airlock_manager_user(self, app, airlock_manager_user):
         app.dependency_overrides[require_airlock_manager] = airlock_manager_user
         app.dependency_overrides[require_workspace_owner_or_researcher_or_airlock_manager] = airlock_manager_user
@@ -465,7 +464,7 @@ async def test_post_revoke_airlock_request_missing_reason_returns_422(self, _, a
 
 class TestAirlockRoutesPermissions():
 
-    @pytest_asyncio.fixture()
+    @pytest.fixture()
     def log_in_with_user(self, app):
         def inner(user):
             app.dependency_overrides[require_workspace_owner_or_researcher] = user
diff --git a/pyproject.toml b/pyproject.toml
index 73f230679..c69eeaa6f 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -3,3 +3,7 @@
 skip = "*.json,*.js,*.ts,*.tsx,*.map,package-lock.json,node_modules,.venv,.git,.yaspeller*,**/*devcontainer*,.gitignore,.gitattributes,LICENSE,Makefile,**/.dockerignore,**/Dockerfile,**/*.tf*,**/*.terraform*,**/requirements.txt,**/*.py,**/*.yml,**/*.yaml,**/*.sh,**/.env.tmpl,**/requirements-dev.txt"
 # Words to ignore
 ignore-words-list = "tre,aci,requestor,api,AspNet,az,AzureTRE,Codespaces,Conda,dataset,datasets,dev,Dev,DevOps,DotNet,exfiltration,Endpoints,GitHub,lifecycle,maintainer,maintainers,PowerShell,PyPi,QuickStart,quickstart,repo,repos,screenshots,terraform,Terraform,tfvars,tmpl,TREs,Xamarin,devcontainer,DevContainer,endpoints,pytest,tre,VNet,resourceType,isCurrent,msfttreacr,azurecr,io,azuretre,cnab,aci,westeurope,idempotent,Versioning,mixins,yml,microsoft,pre-emptively "
+
+[tool.pytest.ini_options]
+asyncio_mode = "strict"
+asyncio_default_fixture_loop_scope = "function"