diff --git a/pkg/model/deployment_chain.proto b/pkg/model/deployment_chain.proto
index f06b68a852..d16f56d5e0 100644
--- a/pkg/model/deployment_chain.proto
+++ b/pkg/model/deployment_chain.proto
@@ -18,8 +18,6 @@ package pipe.model;
 option go_package = "github.com/pipe-cd/pipe/pkg/model";
 
 import "validate/validate.proto";
-import "pkg/model/common.proto";
-import "pkg/model/deployment.proto";
 
 message DeploymentChain {
     // The generated unique identifier.