diff --git a/pyproject.toml b/pyproject.toml
index 830f779f..c9558383 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -56,6 +56,8 @@ test = [
   "pytest-socket",
   "ansi2html",
   "httpretty",
+  # set to 2.2.3 because urllib3>=2.3.0 breaks httpretty (https://github.com/gabrielfalcao/HTTPretty/issues/484)
+  "urllib3==2.2.3", 
   "ptyprocess; sys_platform!='win32'",
   "requests-mock"
 ]