diff --git a/shard.yml b/shard.yml
index b655e1c..58fe034 100644
--- a/shard.yml
+++ b/shard.yml
@@ -4,6 +4,6 @@ version: 0.1.0
 authors:
   - Alexandre Morignot <amorignot@meilleursagents.com>
 
-crystal: 0.36.1
+crystal: ">=0.36.0, <2"
 
 license: MIT