diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 5e63233..a325149 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -40,7 +40,7 @@ jobs:
           - stable
           - beta
           - nightly
-          - 1.58.0  # MSRV
+          - 1.81.0  # MSRV
 
     steps:
       - uses: actions/checkout@v2
diff --git a/Cargo.toml b/Cargo.toml
index 7c31f18..f821be3 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,8 @@
 [package]
 name = "cbor_event"
 version = "3.0.0"
+edition = "2015"
+rust-version = "1.81"
 authors = ["Nicolas Di Prima <nicolas@primetype.co.uk>", "Vincent Hanquez <vincent@typed.io>"]
 license = "MIT OR Apache-2.0"
 readme = "README.md"
diff --git a/src/de.rs b/src/de.rs
index 8ca6694..04b288d 100644
--- a/src/de.rs
+++ b/src/de.rs
@@ -197,7 +197,6 @@ impl<T: Deserialize> Deserialize for Option<T> {
 ///   or unsupported format;
 /// - `Error::IndefiniteLenUnsupported(t)`: the Indefinite length is not
 ///   supported for the given [`Type`] `t`;
-/// - `Error::IoError(io_error)`: error due relating to buffer management;
 ///
 /// # Panic
 ///
diff --git a/src/error.rs b/src/error.rs
index 1f0313b..ef828c1 100644
--- a/src/error.rs
+++ b/src/error.rs
@@ -94,3 +94,12 @@ impl fmt::Display for Error {
         }
     }
 }
+
+impl core::error::Error for Error {
+    fn source(&self) -> Option<&(dyn core::error::Error + 'static)> {
+        match self {
+            Error::InvalidTextError(error) => Some(error),
+            _ => None,
+        }
+    }
+}
diff --git a/src/lib.rs b/src/lib.rs
index 641b2bd..1bcd228 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -4,7 +4,6 @@
 //! [`Deserialize`]: ./de/trait.Deserialize.html
 //! [`Serializer`]: ./se/struct.Serializer.html
 //! [`Serialize`]: ./se/trait.Serialize.html
-//! [`std::io::Write`]: https://doc.rust-lang.org/std/io/trait.Write.html
 //! [`Error`]: ./enum.Error.html
 //! [`Type`]: ./enum.Type.html
 //!
@@ -43,9 +42,8 @@
 //! ## Serialisation: [`Serializer`]
 //!
 //! To serialise your objects into CBOR we provide a simple object
-//! [`Serializer`]. It is configurable with any [`std::io::Write`]
-//! objects. [`Serializer`] is meant to be simple to use and to have
-//! limited overhead.
+//! [`Serializer`]. It is meant to be simple to use and to have limited
+//! overhead.
 //!
 //! ```
 //! use cbor_event::se::{Serializer};
diff --git a/src/se.rs b/src/se.rs
index 6e510c1..45c4ae9 100644
--- a/src/se.rs
+++ b/src/se.rs
@@ -207,8 +207,7 @@ where
 // every _reserve_ calls.
 const DEFAULT_CAPACITY: usize = 512;
 
-/// simple CBOR serializer into any
-/// [`std::io::Write`](https://doc.rust-lang.org/std/io/trait.Write.html).
+/// simple CBOR serializer into an owned byte buffer.
 ///
 #[derive(Debug)]
 pub struct Serializer {