diff --git a/pyproject.toml b/pyproject.toml
index b11c0282..e5bd0d99 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -29,7 +29,7 @@ classifiers = [
 ]
 dependencies = [
     "certifi",
-    "httpcore>=0.15.0,<0.17.0",
+    "httpcore>=0.15.0,<0.18.0",
     "idna",
     "sniffio",
 ]