diff --git a/Readme.md b/Readme.md
index 0f53d49..48eb3d6 100644
--- a/Readme.md
+++ b/Readme.md
@@ -1,7 +1,7 @@
 # Dependency specifiers (PEP 508) in Rust
 
 [![Crates.io](https://img.shields.io/crates/v/pep508_rs.svg?logo=rust&style=flat-square)](https://crates.io/crates/pep508_rs)
-[![PyPI](https://img.shields.io/pypi/v/pep508_rs.svg?logo=python&style=flat-square)](https://pypi.org/project/pep508_rs)
+[![docs.rs](https://img.shields.io/docsrs/pep508_rs?style=flat-square)](https://docs.rs/pep508_rs)
 
 A library for python [dependency specifiers](https://packaging.python.org/en/latest/specifications/dependency-specifiers/), better known as [PEP 508](https://peps.python.org/pep-0508/).
 
diff --git a/src/marker/tree.rs b/src/marker/tree.rs
index 9cdf9d0..dc2b4ac 100644
--- a/src/marker/tree.rs
+++ b/src/marker/tree.rs
@@ -1994,7 +1994,7 @@ mod test {
             if lines == expected {
                 Ok(())
             } else {
-                Err(format!("{:?}", lines))
+                Err(format!("{lines:?}"))
             }
         });
     }