diff --git a/shard.yml b/shard.yml
index 8787db0a..43b39b3b 100644
--- a/shard.yml
+++ b/shard.yml
@@ -15,6 +15,6 @@ scripts:
 executables:
   - ameba
 
-crystal: ">= 0.35.0"
+crystal: ">= 0.35.0, < 2.0.0"
 
 license: MIT