diff --git a/pyproject.toml b/pyproject.toml
index 1db684a..4e0ca2e 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -53,7 +53,8 @@ testing = [
   'pytest-cov',
   'requests',
   'httpx~=0.27.2',
-  'numpy~=1.21'
+  'numpy~=1.21',
+  'anyio~=4.6.0'
 ]
 
 [project.urls]