diff --git a/pyproject.toml b/pyproject.toml
index fc3e95ea..5c9b2dac 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -30,7 +30,6 @@ classifiers = [
 dependencies = [
     "certifi",
     "httpcore==1.*",
-    "anyio",
     "idna",
 ]
 dynamic = ["readme", "version"]
@@ -54,6 +53,9 @@ socks = [
 zstd = [
   "zstandard>=0.18.0",
 ]
+test = [
+    "anyio",
+]
 
 [project.scripts]
 httpx = "httpx:main"