diff --git a/pyproject.toml b/pyproject.toml
index 30228c120e..ceb664f19d 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -29,7 +29,6 @@ classifiers = [
 ]
 dependencies = [
     "certifi",
-    "httpcore>=0.17.2,<0.18.0",
     "idna",
     "sniffio",
 ]
diff --git a/requirements.txt b/requirements.txt
index bd53167bb7..c5bfe7a90e 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -30,3 +30,5 @@ trio==0.22.0
 trio-typing==0.8.0
 trustme==1.0.0
 uvicorn==0.22.0
+
+httpcore @ git+https://github.com/encode/httpcore@master
\ No newline at end of file