diff --git a/rolling_update.yml b/rolling_update.yml
index 1f0e93a8c..19247209c 100644
--- a/rolling_update.yml
+++ b/rolling_update.yml
@@ -51,8 +51,8 @@
       fail:
         msg: "Rolling update from {{ current_version.stdout_lines[0].replace(' ','').split(':')[1] }} to {{ tidb_version }} is forbidden"
       when:
-        - current_version.stdout_lines[0].replace(' ','').split(':')[1] < "v2.0.1"
-        - tidb_version >= "v2.1.0" or tidb_version == "latest"
+        - current_version.stdout_lines[0].replace(' ','').split(':')[1].strip('v') < "2.0.1"
+        - tidb_version == "latest" or tidb_version >= "v2.1.0"
 
 - name: Pre-check PD configuration
   hosts: pd_servers[0]