diff --git a/Cargo.toml b/Cargo.toml
index 38386c98cd..f2f32af36e 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -46,7 +46,6 @@ flate2 = "1"
 insta = "1"
 rayon = "1"
 ref-cast = "1"
-regex = "1"
 reqwest = { version = "0.11", features = ["blocking"] }
 rustversion = "1"
 syn-test-suite = { version = "0", path = "tests/features" }
diff --git a/tests/test_precedence.rs b/tests/test_precedence.rs
index 263b8d147f..89a0f10d96 100644
--- a/tests/test_precedence.rs
+++ b/tests/test_precedence.rs
@@ -39,7 +39,6 @@ extern crate thin_vec;
 use crate::common::eq::SpanlessEq;
 use crate::common::parse;
 use quote::quote;
-use regex::Regex;
 use rustc_ast::ast;
 use rustc_ast::ptr::P;
 use rustc_ast_pretty::pprust;