diff --git a/requirements.txt b/requirements.txt
index 2fea5b6..db37ec7 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,4 @@
 git+https://github.com/CCI-MOC/nerc-rates#egg=nerc_rates
-boto3
+boto3 < 1.36
 dataclasses-json
 requests