diff --git a/tests/compiletest.rs b/tests/compiletest.rs
index f9aea23..641d03c 100644
--- a/tests/compiletest.rs
+++ b/tests/compiletest.rs
@@ -1,3 +1,5 @@
+#![deny(clippy::all, clippy::pedantic)]
+
 #[rustversion::attr(not(nightly), ignore)]
 #[test]
 fn ui() {
diff --git a/tests/test_deprecated.rs b/tests/test_deprecated.rs
index d03cdba..5524666 100644
--- a/tests/test_deprecated.rs
+++ b/tests/test_deprecated.rs
@@ -1,4 +1,4 @@
-#![deny(deprecated)]
+#![deny(deprecated, clippy::all, clippy::pedantic)]
 
 use thiserror::Error;
 
diff --git a/tests/test_display.rs b/tests/test_display.rs
index 34cce94..c2c202d 100644
--- a/tests/test_display.rs
+++ b/tests/test_display.rs
@@ -1,3 +1,5 @@
+#![deny(clippy::all, clippy::pedantic)]
+
 use std::fmt::Display;
 use thiserror::Error;
 
diff --git a/tests/test_error.rs b/tests/test_error.rs
index fab934d..ece7f91 100644
--- a/tests/test_error.rs
+++ b/tests/test_error.rs
@@ -1,3 +1,4 @@
+#![deny(clippy::all, clippy::pedantic)]
 #![allow(dead_code)]
 
 use std::fmt::{self, Display};
diff --git a/tests/test_expr.rs b/tests/test_expr.rs
index 6519635..add5811 100644
--- a/tests/test_expr.rs
+++ b/tests/test_expr.rs
@@ -1,3 +1,5 @@
+#![deny(clippy::all, clippy::pedantic)]
+
 use std::fmt::Display;
 use thiserror::Error;
 
diff --git a/tests/test_from.rs b/tests/test_from.rs
index f1755fb..e8f0161 100644
--- a/tests/test_from.rs
+++ b/tests/test_from.rs
@@ -1,3 +1,5 @@
+#![deny(clippy::all, clippy::pedantic)]
+
 use std::io;
 use thiserror::Error;
 
diff --git a/tests/test_option.rs b/tests/test_option.rs
index 4b41cc1..ca21713 100644
--- a/tests/test_option.rs
+++ b/tests/test_option.rs
@@ -1,4 +1,5 @@
 #![cfg_attr(thiserror_nightly_testing, feature(backtrace))]
+#![deny(clippy::all, clippy::pedantic)]
 
 #[cfg(thiserror_nightly_testing)]
 pub mod structs {
diff --git a/tests/test_path.rs b/tests/test_path.rs
index a34a3d7..a10b1f3 100644
--- a/tests/test_path.rs
+++ b/tests/test_path.rs
@@ -1,3 +1,5 @@
+#![deny(clippy::all, clippy::pedantic)]
+
 use ref_cast::RefCast;
 use std::fmt::Display;
 use std::path::{Path, PathBuf};
diff --git a/tests/test_source.rs b/tests/test_source.rs
index 7c68a3e..66d9dad 100644
--- a/tests/test_source.rs
+++ b/tests/test_source.rs
@@ -1,3 +1,5 @@
+#![deny(clippy::all, clippy::pedantic)]
+
 use std::error::Error as StdError;
 use std::io;
 use thiserror::Error;
diff --git a/tests/test_transparent.rs b/tests/test_transparent.rs
index 8fba5fe..b862b25 100644
--- a/tests/test_transparent.rs
+++ b/tests/test_transparent.rs
@@ -1,3 +1,5 @@
+#![deny(clippy::all, clippy::pedantic)]
+
 use anyhow::anyhow;
 use std::error::Error as _;
 use std::io;