diff --git a/tracing-core/CHANGELOG.md b/tracing-core/CHANGELOG.md
index dcfdd9b10e..87b12d80a6 100644
--- a/tracing-core/CHANGELOG.md
+++ b/tracing-core/CHANGELOG.md
@@ -1,3 +1,27 @@
+# 0.1.21 (October 1, 2021)
+
+This release adds support for recording `Option<T> where T: Value` as typed
+`tracing` field values.
+
+### Added
+
+- **field**: `Value` impl for `Option<T> where T: Value` ([#1585])
+
+### Fixed
+
+- Fixed deprecation warnings when building with `default-features` disabled
+  ([#1603], [#1606])
+- Documentation fixes and improvements ([#1595], [#1601])
+
+Thanks to @brianburgers, @DCjanus, and @matklad for contributing to this
+release!
+
+[#1585]: https://github.com/tokio-rs/tracing/pull/1585
+[#1595]: https://github.com/tokio-rs/tracing/pull/1595
+[#1601]: https://github.com/tokio-rs/tracing/pull/1601
+[#1603]: https://github.com/tokio-rs/tracing/pull/1603
+[#1606]: https://github.com/tokio-rs/tracing/pull/1606
+
 # 0.1.20 (September 12, 2021)
 
 This release adds support for `f64` as one of the `tracing-core`
diff --git a/tracing-core/Cargo.toml b/tracing-core/Cargo.toml
index a8561da9ba..4c97523692 100644
--- a/tracing-core/Cargo.toml
+++ b/tracing-core/Cargo.toml
@@ -8,7 +8,7 @@ name = "tracing-core"
 #   - README.md
 # - Update CHANGELOG.md.
 # - Create "v0.1.x" git tag.
-version = "0.1.20"
+version = "0.1.21"
 authors = ["Tokio Contributors <team@tokio.rs>"]
 license = "MIT"
 readme = "README.md"
diff --git a/tracing-core/README.md b/tracing-core/README.md
index e31c45f18c..9e7ac2492e 100644
--- a/tracing-core/README.md
+++ b/tracing-core/README.md
@@ -16,9 +16,9 @@ Core primitives for application-level tracing.
 [Documentation][docs-url] | [Chat][discord-url]
 
 [crates-badge]: https://img.shields.io/crates/v/tracing-core.svg
-[crates-url]: https://crates.io/crates/tracing-core/0.1.20
+[crates-url]: https://crates.io/crates/tracing-core/0.1.21
 [docs-badge]: https://docs.rs/tracing-core/badge.svg
-[docs-url]: https://docs.rs/tracing-core/0.1.20
+[docs-url]: https://docs.rs/tracing-core/0.1.21
 [docs-master-badge]: https://img.shields.io/badge/docs-master-blue
 [docs-master-url]: https://tracing-rs.netlify.com/tracing_core
 [mit-badge]: https://img.shields.io/badge/license-MIT-blue.svg
@@ -79,22 +79,22 @@ The following crate feature flags are available:
 
   ```toml
   [dependencies]
-  tracing-core = { version = "0.1.20", default-features = false }
+  tracing-core = { version = "0.1.21", default-features = false }
   ```
 
   **Note**:`tracing-core`'s `no_std` support requires `liballoc`.
 
 [`tracing`]: ../tracing
-[`span::Id`]: https://docs.rs/tracing-core/0.1.20/tracing_core/span/struct.Id.html
-[`Event`]: https://docs.rs/tracing-core/0.1.20/tracing_core/event/struct.Event.html
-[`Subscriber`]: https://docs.rs/tracing-core/0.1.20/tracing_core/subscriber/trait.Subscriber.html
-[`Metadata`]: https://docs.rs/tracing-core/0.1.20/tracing_core/metadata/struct.Metadata.html
-[`Callsite`]: https://docs.rs/tracing-core/0.1.20/tracing_core/callsite/trait.Callsite.html
-[`Field`]: https://docs.rs/tracing-core/0.1.20/tracing_core/field/struct.Field.html
-[`FieldSet`]: https://docs.rs/tracing-core/0.1.20/tracing_core/field/struct.FieldSet.html
-[`Value`]: https://docs.rs/tracing-core/0.1.20/tracing_core/field/trait.Value.html
-[`ValueSet`]: https://docs.rs/tracing-core/0.1.20/tracing_core/field/struct.ValueSet.html
-[`Dispatch`]: https://docs.rs/tracing-core/0.1.20/tracing_core/dispatcher/struct.Dispatch.html
+[`span::Id`]: https://docs.rs/tracing-core/0.1.21/tracing_core/span/struct.Id.html
+[`Event`]: https://docs.rs/tracing-core/0.1.21/tracing_core/event/struct.Event.html
+[`Subscriber`]: https://docs.rs/tracing-core/0.1.21/tracing_core/subscriber/trait.Subscriber.html
+[`Metadata`]: https://docs.rs/tracing-core/0.1.21/tracing_core/metadata/struct.Metadata.html
+[`Callsite`]: https://docs.rs/tracing-core/0.1.21/tracing_core/callsite/trait.Callsite.html
+[`Field`]: https://docs.rs/tracing-core/0.1.21/tracing_core/field/struct.Field.html
+[`FieldSet`]: https://docs.rs/tracing-core/0.1.21/tracing_core/field/struct.FieldSet.html
+[`Value`]: https://docs.rs/tracing-core/0.1.21/tracing_core/field/trait.Value.html
+[`ValueSet`]: https://docs.rs/tracing-core/0.1.21/tracing_core/field/struct.ValueSet.html
+[`Dispatch`]: https://docs.rs/tracing-core/0.1.21/tracing_core/dispatcher/struct.Dispatch.html
 
 ## Supported Rust Versions
 
diff --git a/tracing-core/src/lib.rs b/tracing-core/src/lib.rs
index c29a9d7842..9bf8f363ae 100644
--- a/tracing-core/src/lib.rs
+++ b/tracing-core/src/lib.rs
@@ -53,7 +53,7 @@
 //!
 //!   ```toml
 //!   [dependencies]
-//!   tracing-core = { version = "0.1.20", default-features = false }
+//!   tracing-core = { version = "0.1.21", default-features = false }
 //!   ```
 //!
 //!   **Note**:`tracing-core`'s `no_std` support requires `liballoc`.
@@ -85,7 +85,7 @@
 //! [`Dispatch`]: dispatcher/struct.Dispatch.html
 //! [`tokio-rs/tracing`]: https://github.com/tokio-rs/tracing
 //! [`tracing`]: https://crates.io/crates/tracing
-#![doc(html_root_url = "https://docs.rs/tracing-core/0.1.20")]
+#![doc(html_root_url = "https://docs.rs/tracing-core/0.1.21")]
 #![doc(
     html_logo_url = "https://raw.githubusercontent.com/tokio-rs/tracing/master/assets/logo-type.png",
     issue_tracker_base_url = "https://github.com/tokio-rs/tracing/issues/"