diff --git a/packages/web_apps/setup.cfg b/packages/web_apps/setup.cfg
index 615e5b4bdb4..c67f3da6c60 100644
--- a/packages/web_apps/setup.cfg
+++ b/packages/web_apps/setup.cfg
@@ -42,7 +42,7 @@ install_requires =
     apispec
     Babel
     Cheetah3
-    fastapi>=0.68.2,!=0.69.0,!=0.70.0,!=0.70.1
+    fastapi>=0.68.2,!=0.69.0,!=0.70.0,!=0.70.1,<0.99
     fastapi-utils
     gunicorn
     gxformat2
diff --git a/pyproject.toml b/pyproject.toml
index ad6f33dc6e5..723924fbdaf 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -51,7 +51,7 @@ dictobj = "*"
 dnspython = "*"
 docutils = "!=0.17, !=0.17.1"
 edam-ontology = "*"
-fastapi = ">=0.71.0, !=0.89.0"  # https://github.com/tiangolo/fastapi/issues/4041 https://github.com/tiangolo/fastapi/issues/5861
+fastapi = ">=0.71.0, !=0.89.0, <0.99"  # https://github.com/tiangolo/fastapi/issues/4041 https://github.com/tiangolo/fastapi/issues/5861
 fastapi-utils = "*"
 fs = "*"
 future = "*"