diff --git a/Cargo.toml b/Cargo.toml
index 9a66f3c9..6d6182fc 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -27,7 +27,7 @@ all-features = true
 url = "2.1.1"
 serde = { version = "1.0.104", features = ["derive"] }
 serde_json = "1.0.48"
-unicode-id  = "0.3"
+unicode-id-start = "1"
 if_chain = "1.0.0"
 scroll = { version = "0.10.1", features = ["derive"], optional = true }
 data-encoding = "2.3.3"
diff --git a/src/js_identifiers.rs b/src/js_identifiers.rs
index 93caeeef..d44b282a 100644
--- a/src/js_identifiers.rs
+++ b/src/js_identifiers.rs
@@ -1,12 +1,10 @@
-use unicode_id::UnicodeID;
-
 /// Returns true if `c` is a valid character for an identifier start.
 fn is_valid_start(c: char) -> bool {
     c == '$' || c == '_' || c.is_ascii_alphabetic() || {
         if c.is_ascii() {
             false
         } else {
-            UnicodeID::is_id_start(c)
+            unicode_id_start::is_id_start_unicode(c)
         }
     }
 }
@@ -21,7 +19,7 @@ fn is_valid_continue(c: char) -> bool {
         if c.is_ascii() {
             false
         } else {
-            UnicodeID::is_id_continue(c)
+            unicode_id_start::is_id_continue_unicode(c)
         }
     }
 }