diff --git a/Cargo.toml b/Cargo.toml
index 8285045d..8774079d 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "syn"
-version = "1.0.20" # don't forget to update html_root_url and syn.json
+version = "1.0.21" # don't forget to update html_root_url and syn.json
 authors = ["David Tolnay <dtolnay@gmail.com>"]
 license = "MIT OR Apache-2.0"
 description = "Parser for Rust source code"
diff --git a/src/lib.rs b/src/lib.rs
index 635ad725..d2eaa03c 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -250,7 +250,7 @@
 //!   dynamic library libproc_macro from rustc toolchain.
 
 // Syn types in rustdoc of other crates get linked to here.
-#![doc(html_root_url = "https://docs.rs/syn/1.0.20")]
+#![doc(html_root_url = "https://docs.rs/syn/1.0.21")]
 #![deny(clippy::all, clippy::pedantic)]
 // Ignored clippy lints.
 #![allow(
diff --git a/syn.json b/syn.json
index 35dd47f8..1b18c4fb 100644
--- a/syn.json
+++ b/syn.json
@@ -1,5 +1,5 @@
 {
-  "version": "1.0.20",
+  "version": "1.0.21",
   "types": [
     {
       "ident": "Abi",