diff --git a/.circleci/Gemfile b/.circleci/Gemfile
index a21c6d08..7ee5d28c 100644
--- a/.circleci/Gemfile
+++ b/.circleci/Gemfile
@@ -1,7 +1,7 @@
 # Gemfile for running conformance tests with Anyt
 source "https://rubygems.org"
 
-gem "nats-pure"
+gem "nats-pure", "< 2.3.0"
 gem "colorize"
 gem "puma"