diff --git a/build/probe.rs b/build/probe.rs
index 0dce6f5..2843787 100644
--- a/build/probe.rs
+++ b/build/probe.rs
@@ -5,7 +5,7 @@
 #![feature(error_generic_member_access)]
 
 use std::error::{Error, Request};
-use std::fmt::{self, Debug, Display};
+use core::fmt::{self, Debug, Display};
 
 struct MyError(Thing);
 struct Thing;
diff --git a/src/aserror.rs b/src/aserror.rs
index 54fc6f1..4cd0fec 100644
--- a/src/aserror.rs
+++ b/src/aserror.rs
@@ -1,5 +1,5 @@
 use std::error::Error;
-use std::panic::UnwindSafe;
+use core::panic::UnwindSafe;
 
 #[doc(hidden)]
 pub trait AsDynError<'a>: Sealed {
diff --git a/src/display.rs b/src/display.rs
index 27098f1..3c43216 100644
--- a/src/display.rs
+++ b/src/display.rs
@@ -1,4 +1,4 @@
-use std::fmt::Display;
+use core::fmt::Display;
 use std::path::{self, Path, PathBuf};
 
 #[doc(hidden)]
diff --git a/src/lib.rs b/src/lib.rs
index 81a04b0..9b9c5af 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -62,7 +62,7 @@
 //!   which may be arbitrary expressions. For example:
 //!
 //!   ```rust
-//!   # use std::i32;
+//!   # use core::i32;
 //!   # use thiserror::Error;
 //!   #
 //!   #[derive(Error, Debug)]
@@ -129,7 +129,7 @@
 //!   std::error::Error` will work as a source.
 //!
 //!   ```rust
-//!   # use std::fmt::{self, Display};
+//!   # use core::fmt::{self, Display};
 //!   # use thiserror::Error;
 //!   #
 //!   #[derive(Error, Debug)]
diff --git a/tests/test_display.rs b/tests/test_display.rs
index 95a210f..c05d157 100644
--- a/tests/test_display.rs
+++ b/tests/test_display.rs
@@ -1,6 +1,6 @@
 #![allow(clippy::needless_raw_string_hashes, clippy::uninlined_format_args)]
 
-use std::fmt::{self, Display};
+use core::fmt::{self, Display};
 use thiserror::Error;
 
 fn assert<T: Display>(expected: &str, value: T) {
diff --git a/tests/test_error.rs b/tests/test_error.rs
index fab934d..eb52cef 100644
--- a/tests/test_error.rs
+++ b/tests/test_error.rs
@@ -1,6 +1,6 @@
 #![allow(dead_code)]
 
-use std::fmt::{self, Display};
+use core::fmt::{self, Display};
 use std::io;
 use thiserror::Error;
 
diff --git a/tests/test_expr.rs b/tests/test_expr.rs
index 028f34e..c5e3b4b 100644
--- a/tests/test_expr.rs
+++ b/tests/test_expr.rs
@@ -1,6 +1,6 @@
 #![allow(clippy::iter_cloned_collect, clippy::uninlined_format_args)]
 
-use std::fmt::Display;
+use core::fmt::Display;
 use thiserror::Error;
 
 // Some of the elaborate cases from the rcc codebase, which is a C compiler in
diff --git a/tests/test_generics.rs b/tests/test_generics.rs
index c94d95e..ac5d6f3 100644
--- a/tests/test_generics.rs
+++ b/tests/test_generics.rs
@@ -1,6 +1,6 @@
 #![allow(clippy::needless_late_init, clippy::uninlined_format_args)]
 
-use std::fmt::{self, Debug, Display};
+use core::fmt::{self, Debug, Display};
 use thiserror::Error;
 
 pub struct NoFormat;
diff --git a/tests/test_path.rs b/tests/test_path.rs
index a34a3d7..f054077 100644
--- a/tests/test_path.rs
+++ b/tests/test_path.rs
@@ -1,5 +1,5 @@
+use core::fmt::Display;
 use ref_cast::RefCast;
-use std::fmt::Display;
 use std::path::{Path, PathBuf};
 use thiserror::Error;
 
diff --git a/tests/ui/fallback-impl-with-display.rs b/tests/ui/fallback-impl-with-display.rs
index 3341187..23dcf28 100644
--- a/tests/ui/fallback-impl-with-display.rs
+++ b/tests/ui/fallback-impl-with-display.rs
@@ -1,4 +1,4 @@
-use std::fmt::{self, Display};
+use core::fmt::{self, Display};
 use thiserror::Error;
 
 #[derive(Error, Debug)]
diff --git a/tests/ui/lifetime.rs b/tests/ui/lifetime.rs
index 698f8c4..a82909d 100644
--- a/tests/ui/lifetime.rs
+++ b/tests/ui/lifetime.rs
@@ -1,4 +1,4 @@
-use std::fmt::Debug;
+use core::fmt::Debug;
 use thiserror::Error;
 
 #[derive(Error, Debug)]