diff --git a/requirements.txt b/requirements.txt
index 989acbd..611a231 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -41,7 +41,7 @@
     #   requests
 cffi==1.15.1
     # via cryptography
-charset-normalizer==3.1.0
+charset-normalizer==3.0.1
     # via requests
 cliff==4.2.0
     # via gnocchiclient
@@ -162,7 +162,7 @@
     #   python-novaclient
 prometheus-client==0.16.0
     # via -r requirements.in
-protobuf==4.22.1
+protobuf==3.20.3
     # via
     #   -r requirements.in
     #   google-api-core