diff --git a/CI_REQUIREMENTS.txt b/CI_REQUIREMENTS.txt
index ee85e20..05b5900 100644
--- a/CI_REQUIREMENTS.txt
+++ b/CI_REQUIREMENTS.txt
@@ -1,5 +1,5 @@
 typing >= 3.6 ; python_version < "3.7"
 mock; python_version == "2.7"
 futures>=3.1; python_version == "2.7"
-gevent >= 1.2, !=1.3.0 ; python_version < "3.7"
-gevent >= 1.3 ; python_version >= "3.7"
+gevent >= 1.2, <1.3.0 ; platform_python_implementation == "PyPy"
+gevent >= 1.2 ; platform_python_implementation != "PyPy"