diff --git a/Cargo.lock b/Cargo.lock
index ee26f60695a..7391542e494 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1395,9 +1395,9 @@ dependencies = [
 
 [[package]]
 name = "rustc-ap-rustc_lexer"
-version = "688.0.0"
+version = "691.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ebbdcc99bd015349093fcbae4780fda21416fec5d8843acfb3d1733e130cd4db"
+checksum = "44bc89d9ca7a78fb82e103b389362c55f03800745f8ba14e068b805cfaf783ec"
 dependencies = [
  "unicode-xid",
 ]
diff --git a/crates/syntax/Cargo.toml b/crates/syntax/Cargo.toml
index ce62babc3ff..c6a6f11e133 100644
--- a/crates/syntax/Cargo.toml
+++ b/crates/syntax/Cargo.toml
@@ -13,7 +13,7 @@ doctest = false
 [dependencies]
 itertools = "0.9.0"
 rowan = "0.10.0"
-rustc_lexer = { version = "688.0.0", package = "rustc-ap-rustc_lexer" }
+rustc_lexer = { version = "691.0.0", package = "rustc-ap-rustc_lexer" }
 rustc-hash = "1.1.0"
 arrayvec = "0.5.1"
 once_cell = "1.3.1"