diff --git a/RELEASE.md b/RELEASE.md
index ad403abd86..aac66f46b7 100644
--- a/RELEASE.md
+++ b/RELEASE.md
@@ -15,6 +15,7 @@ Please follow the established format:
 - Ensure Kedro-Viz works when hosted on a URL subpath. (#1621)
 - Fix shareable URL modal to appear across the app. (#1639)
 - Refactor flowchart dataclasses to pydantic base models. (#1565)
+- Bump FAST API upper bounds. (#1634)
 
 # Release 6.6.1
 
diff --git a/package/features/steps/lower_requirements.txt b/package/features/steps/lower_requirements.txt
index 317309a4c2..1fcded74bd 100644
--- a/package/features/steps/lower_requirements.txt
+++ b/package/features/steps/lower_requirements.txt
@@ -13,3 +13,4 @@ strawberry-graphql==0.192.0
 networkx==2.5
 orjson==3.9
 secure==0.3.0
+pydantic==1.10
\ No newline at end of file
diff --git a/package/requirements.txt b/package/requirements.txt
index b3d2b9cd36..eae1065c81 100644
--- a/package/requirements.txt
+++ b/package/requirements.txt
@@ -1,7 +1,9 @@
 packaging~=23.0
 kedro>=0.17.5
 ipython>=7.0.0, <9.0
-fastapi>=0.73.0, <0.96.0
+fastapi>=0.73.0,<0.200.0; python_version >= '3.8'
+fastapi>=0.73.0,<0.104.0; python_version < '3.8'
+pydantic<2
 fsspec[s3]>=2021.4, <2024.1 
 aiofiles>=22.1.0
 uvicorn[standard]~=0.22.0
diff --git a/package/test_requirements.txt b/package/test_requirements.txt
index 30db55eda9..5a6d2d0d71 100644
--- a/package/test_requirements.txt
+++ b/package/test_requirements.txt
@@ -8,7 +8,6 @@ behave~=1.2
 black~=23.3
 boto3~=1.26
 flake8~=5.0
-fastapi[all]>=0.73.0, <0.96.0
 isort~=5.11
 matplotlib~=3.5
 mypy~=1.0
@@ -26,6 +25,7 @@ sqlalchemy-stubs~=0.4
 strawberry-graphql[cli]>=0.99.0, <1.0
 trufflehog~=2.2
 typing_extensions~=4.7.0; python_version < '3.9'
+httpx~=0.24.0
 
 # mypy
 types-aiofiles==0.1.3