diff --git a/docs/2022-07-19-migrate-to-buf.html b/docs/2022-07-19-migrate-to-buf.html
index e519b66..a0f8366 100644
--- a/docs/2022-07-19-migrate-to-buf.html
+++ b/docs/2022-07-19-migrate-to-buf.html
@@ -88,7 +88,6 @@
 <span class="pl-c">// +build tools</span>
 
 <span class="pl-k">import</span> (
-  _ <span class="pl-s">"github.com/golang/protobuf/protoc-gen-go"</span>
   _ <span class="pl-s">"github.com/grpc-ecosystem/grpc-gateway/protoc-gen-grpc-gateway"</span>
   _ <span class="pl-s">"github.com/grpc-ecosystem/grpc-gateway/protoc-gen-swagger"</span>
   _ <span class="pl-s">"github.com/kei2100/protoc-gen-marshal-zap/plugin/protoc-gen-marshal-zap"</span>
@@ -115,9 +114,9 @@
 <span class="pl-ent">plugins</span>:
   - <span class="pl-ent">plugin</span>: <span class="pl-s">buf.build/grpc/go:v1.3.0</span>
     <span class="pl-ent">out</span>: <span class="pl-s">pkg</span>
-  - <span class="pl-ent">plugin</span>: <span class="pl-s">buf.build/protocolbuffers/go:v1.30.0</span>
+  - <span class="pl-ent">plugin</span>: <span class="pl-s">buf.build/protocolbuffers/go:v1.31.0</span>
     <span class="pl-ent">out</span>: <span class="pl-s">pkg</span>
-  - <span class="pl-ent">plugin</span>: <span class="pl-s">buf.build/bufbuild/validate-go:v1.0.1</span>
+  - <span class="pl-ent">plugin</span>: <span class="pl-s">buf.build/bufbuild/validate-go:v1.0.2</span>
     <span class="pl-ent">out</span>: <span class="pl-s">pkg</span>
     <span class="pl-ent">opt</span>:
       - <span class="pl-s">lang=go</span>
diff --git a/posts/2022-07-19-migrate-to-buf.md b/posts/2022-07-19-migrate-to-buf.md
index 8062fbb..795d3e8 100644
--- a/posts/2022-07-19-migrate-to-buf.md
+++ b/posts/2022-07-19-migrate-to-buf.md
@@ -21,7 +21,6 @@ FYI, I use:
 // +build tools
 
 import (
-  _ "github.com/golang/protobuf/protoc-gen-go"
   _ "github.com/grpc-ecosystem/grpc-gateway/protoc-gen-grpc-gateway"
   _ "github.com/grpc-ecosystem/grpc-gateway/protoc-gen-swagger"
   _ "github.com/kei2100/protoc-gen-marshal-zap/plugin/protoc-gen-marshal-zap"
@@ -52,9 +51,9 @@ version: v1
 plugins:
   - plugin: buf.build/grpc/go:v1.3.0
     out: pkg
-  - plugin: buf.build/protocolbuffers/go:v1.30.0
+  - plugin: buf.build/protocolbuffers/go:v1.31.0
     out: pkg
-  - plugin: buf.build/bufbuild/validate-go:v1.0.1
+  - plugin: buf.build/bufbuild/validate-go:v1.0.2
     out: pkg
     opt:
       - lang=go