diff --git a/httpcore/_ssl.py b/httpcore/_ssl.py
index c99c5a679..629f002f0 100644
--- a/httpcore/_ssl.py
+++ b/httpcore/_ssl.py
@@ -1,6 +1,6 @@
 import ssl
 
-import certifi
+import certifi  # type: ignore
 
 
 def default_ssl_context() -> ssl.SSLContext:
diff --git a/requirements.txt b/requirements.txt
index 3b0e425d5..7d1eb322f 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -31,5 +31,4 @@ pytest-httpbin==1.0.1
 pytest-trio==0.7.0
 pytest-asyncio==0.16.0
 trustme==0.9.0
-types-certifi==2021.10.8.0
 uvicorn==0.12.1; python_version < '3.7'