diff --git a/pkgs/development/python-modules/httpcore/default.nix b/pkgs/development/python-modules/httpcore/default.nix
index aa15c2555e6..dbbdf0bb38c 100644
--- a/pkgs/development/python-modules/httpcore/default.nix
+++ b/pkgs/development/python-modules/httpcore/default.nix
@@ -9,18 +9,20 @@
 , pytestcov
 , sniffio
 , uvicorn
+, trustme
+, trio
 }:
 
 buildPythonPackage rec {
   pname = "httpcore";
-  version = "0.12.0";
+  version = "0.12.3";
   disabled = pythonOlder "3.6";
 
   src = fetchFromGitHub {
     owner = "encode";
     repo = pname;
     rev = version;
-    sha256 = "0bwxn7m7r7h6k41swxj0jqj3nzi76wqxwbnry6y7d4qfh4m26g2j";
+    sha256 = "09hbjc5wzhrnri5y3idxcq329d7jiaxljc7y6npwv9gh9saln109";
   };
 
   propagatedBuildInputs = [
@@ -34,11 +36,15 @@ buildPythonPackage rec {
     pytestCheckHook
     pytestcov
     uvicorn
+    trustme
+    trio
   ];
 
   pytestFlagsArray = [
     # these tests fail during dns lookups: httpcore.ConnectError: [Errno -2] Name or service not known
+    "--ignore=tests/test_threadsafety.py"
     "--ignore=tests/sync_tests/test_interfaces.py"
+    "--ignore=tests/sync_tests/test_retries.py"
   ];
 
   pythonImportsCheck = [ "httpcore" ];