diff --git a/requirements.txt b/requirements.txt
index 31c6975..918db68 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -6,7 +6,7 @@ chardet==3.0.4
 h11==0.8.1
 h2==3.1.1
 hpack==3.0.0
-httpcore==0.3.0
+httpcore==0.13.3
 httptools==0.0.13
 hyperframe==5.2.0
 idna==2.8