diff --git a/requirements.txt b/requirements.txt
index f1f6068c..b3df57ea 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,5 +1,6 @@
-gevent>=1.1.0; python_version < "3.8"
-gevent>=1.5.0; python_version >= "3.8"
+gevent==1.4.0; python_version <= "3.6"
+greenlet==0.4.16; python_version <= "3.6"
+gevent>=20.9.0; python_version >= "3.7"
 msgpack>=0.4.4
 base58
 merkletools