diff --git a/pyproject.toml b/pyproject.toml
index 69259ac3f..44f6d3e95 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -43,7 +43,7 @@ dependencies = [
   "jsonschema>=4.26.0",
   "django-csp>=4.0",
   "opentelemetry-instrumentation-jinja2>=0.61b0",
-  "openfeature-sdk>=0.8.4,<0.9.0",
+  "openfeature-sdk>=0.9.0,<0.10.0",
 ]
 
 [dependency-groups]
diff --git a/uv.lock b/uv.lock
index 0c4ef4c8e..4a4bab716 100644
--- a/uv.lock
+++ b/uv.lock
@@ -916,7 +916,7 @@ requires-dist = [
     { name = "mesh-client", specifier = ">=3.2.3,<6.0.0" },
     { name = "nhsuk-frontend-jinja", specifier = "==0.7.2" },
     { name = "ninja-put-patch-file-upload-middleware", specifier = ">=0.1.4" },
-    { name = "openfeature-sdk", specifier = ">=0.8.4,<0.9.0" },
+    { name = "openfeature-sdk", specifier = ">=0.9.0,<0.10.0" },
     { name = "opentelemetry-instrumentation-jinja2", specifier = ">=0.61b0" },
     { name = "pandas", specifier = ">=2.3.0,<4.0.0" },
     { name = "phonenumbers", specifier = ">=9.0.28" },
@@ -1121,11 +1121,11 @@ wheels = [
 
 [[package]]
 name = "openfeature-sdk"
-version = "0.8.4"
+version = "0.9.0"
 source = { registry = "https://pypi.org/simple" }
-sdist = { url = "https://files.pythonhosted.org/packages/3b/08/f6698d0614b8703170117b786bd77b7b0a04f3ee00f19fbe9b360d2dee69/openfeature_sdk-0.8.4.tar.gz", hash = "sha256:66abf71f928ec8c0db1111072bb0ef2635dfbd09510f77f4b548e5d0ea0e6c1a", size = 29676, upload-time = "2025-12-09T07:31:13.137Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/50/e1/866235e4333cc2065376ff95241297a405a8ff50a8b12662844ba624ffd6/openfeature_sdk-0.9.0.tar.gz", hash = "sha256:d65ca82c3f1abc5005b0b54bb4c729db04d7a70595f05dd373b47477b6b176bf", size = 32242, upload-time = "2026-04-21T18:09:50.306Z" }
 wheels = [
-    { url = "https://files.pythonhosted.org/packages/9c/80/f6532778188c573cc83790b11abccde717d4c1442514e722d6bb6140e55c/openfeature_sdk-0.8.4-py3-none-any.whl", hash = "sha256:805ba090669798fc343ca9fdcbc56ff0f4b57bf6757533f0854d2021192e620a", size = 35986, upload-time = "2025-12-09T07:31:12.092Z" },
+    { url = "https://files.pythonhosted.org/packages/e8/4f/3f2e32a04505bfce0a02c541830cd862581076bb6422521d4ba9ff6840f8/openfeature_sdk-0.9.0-py3-none-any.whl", hash = "sha256:511fd66fe66807e95ea5a18074b559bc18657fe8294be0de4668201e297e98ad", size = 37804, upload-time = "2026-04-21T18:09:48.967Z" },
 ]
 
 [[package]]