diff --git a/adapter/mysql/adapter_test.go b/adapter/mysql/adapter_test.go
index c041d96..3a7dd5f 100644
--- a/adapter/mysql/adapter_test.go
+++ b/adapter/mysql/adapter_test.go
@@ -34,7 +34,7 @@ func withDatabase(callback func(*Adapter)) {
 		panic(err)
 	}
 
-	defer close()
+	defer close() //nolint:errcheck
 
 	adapter.db.MustExec("DROP TABLE IF EXISTS followers;")
 	adapter.db.MustExec("DROP TABLE IF EXISTS articles;")
diff --git a/adapter/oracle/adapter_test.go b/adapter/oracle/adapter_test.go
index d2ad5b0..33f0caa 100644
--- a/adapter/oracle/adapter_test.go
+++ b/adapter/oracle/adapter_test.go
@@ -32,7 +32,7 @@ func withDatabase(callback func(*Adapter)) {
 		panic(err)
 	}
 
-	defer close()
+	defer close() //nolint:errcheck
 
 	// adapter.db.MustExec("DROP TABLE followers")
 	// adapter.db.MustExec("DROP TABLE articles")
diff --git a/adapter/postgresql/adapter_test.go b/adapter/postgresql/adapter_test.go
index 079921f..2b2b1bf 100644
--- a/adapter/postgresql/adapter_test.go
+++ b/adapter/postgresql/adapter_test.go
@@ -32,7 +32,7 @@ func withDatabase(callback func(*Adapter)) {
 		panic(err)
 	}
 
-	defer close()
+	defer close() //nolint:errcheck
 
 	adapter.db.MustExec("DROP TABLE IF EXISTS followers;")
 	adapter.db.MustExec("DROP TABLE IF EXISTS articles;")
diff --git a/adapter/sqlite3/adapter_test.go b/adapter/sqlite3/adapter_test.go
index 12d6adf..a9aec2f 100644
--- a/adapter/sqlite3/adapter_test.go
+++ b/adapter/sqlite3/adapter_test.go
@@ -14,7 +14,7 @@ func withDatabase(callback func(*Adapter)) {
 		panic(err)
 	}
 
-	defer close()
+	defer close() //nolint:errcheck
 
 	adapter.DB.MustExec("PRAGMA foreign_keys = ON;")
 
diff --git a/cmd/plant_erd-oracle/main.go b/cmd/plant_erd-oracle/main.go
index 0e15372..b71b983 100644
--- a/cmd/plant_erd-oracle/main.go
+++ b/cmd/plant_erd-oracle/main.go
@@ -82,7 +82,7 @@ func main() {
 			return errors.WithStack(err)
 		}
 
-		return generator.Run(schema)
+		return generator.Run(schema) //nolint:errcheck
 	}
 
 	sort.Sort(cli.CommandsByName(app.Commands))
diff --git a/cmd/plant_erd/main.go b/cmd/plant_erd/main.go
index 3554d92..5efbbde 100644
--- a/cmd/plant_erd/main.go
+++ b/cmd/plant_erd/main.go
@@ -67,7 +67,7 @@ func main() {
 					return errors.WithStack(err)
 				}
 
-				return generator.Run(schema)
+				return generator.Run(schema) //nolint:errcheck
 			},
 		},
 		{
@@ -135,7 +135,7 @@ func main() {
 					return errors.WithStack(err)
 				}
 
-				return generator.Run(schema)
+				return generator.Run(schema) //nolint:errcheck
 			},
 		},
 		{
@@ -199,7 +199,7 @@ func main() {
 					return errors.WithStack(err)
 				}
 
-				return generator.Run(schema)
+				return generator.Run(schema) //nolint:errcheck
 			},
 		},
 	}
diff --git a/lib/erd_generator_test.go b/lib/erd_generator_test.go
index 7c4271c..71b43ae 100644
--- a/lib/erd_generator_test.go
+++ b/lib/erd_generator_test.go
@@ -2,6 +2,7 @@ package lib
 
 import (
 	"bytes"
+	"github.com/stretchr/testify/require"
 	"io"
 	"os"
 	"path/filepath"
@@ -214,7 +215,8 @@ func TestErdGenerator_output_ToFile(t *testing.T) {
 		Filepath: filePath,
 	}
 
-	g.output("aaa")
+	err := g.output("aaa")
+	require.NoError(t, err)
 
 	data, err := os.ReadFile(filePath)
 
@@ -237,10 +239,16 @@ func captureStdout(f func()) string {
 	f()
 
 	os.Stdout = stdout
-	w.Close()
+	err = w.Close()
+	if err != nil {
+		panic(err)
+	}
 
 	var buf bytes.Buffer
-	io.Copy(&buf, r)
+	_, err = io.Copy(&buf, r)
+	if err != nil {
+		panic(err)
+	}
 
 	return buf.String()
 }