diff --git a/requirements.txt b/requirements.txt
index 88e34a5..0e625a1 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,6 +2,8 @@ PyYAML
 nose >=1.0.0
 boto >=2.6.0
 boto3 >=1.0.0
+# botocore-1.28 broke v2 signatures, see https://tracker.ceph.com/issues/58059
+botocore <1.28.0
 munch >=2.0.0
 # 0.14 switches to libev, that means bootstrap needs to change too
 gevent >=1.0