diff --git a/parser/Cargo.toml b/parser/Cargo.toml
index 26241c4..e3ce5a3 100644
--- a/parser/Cargo.toml
+++ b/parser/Cargo.toml
@@ -28,11 +28,11 @@ log = "0.4.16"
 num-bigint = "0.4.3"
 num-traits = "0.2.14"
 phf = "0.10.1"
+rustc-hash = "1.1.0"
+thiserror = "1.0"
 unic-emoji-char = "0.9.0"
 unic-ucd-ident  = "0.9.0"
 unicode_names2 = "0.5.0"
-thiserror = "1.0"
-fnv = "1.0.7"
 
 [dev-dependencies]
 insta = "1.14.0"
diff --git a/parser/src/function.rs b/parser/src/function.rs
index b2b24a8..bc4d514 100644
--- a/parser/src/function.rs
+++ b/parser/src/function.rs
@@ -1,6 +1,6 @@
 use crate::ast;
 use crate::error::{LexicalError, LexicalErrorType};
-use fnv::FnvHashSet;
+use rustc_hash::FxHashSet;
 
 pub struct ArgumentList {
     pub args: Vec<ast::Expr>,
@@ -54,7 +54,7 @@ pub fn parse_args(func_args: Vec<FunctionArgument>) -> Result<ArgumentList, Lexi
     let mut keywords = vec![];
 
     let mut keyword_names =
-        FnvHashSet::with_capacity_and_hasher(func_args.len(), Default::default());
+        FxHashSet::with_capacity_and_hasher(func_args.len(), Default::default());
     for (name, value) in func_args {
         match name {
             Some((start, end, name)) => {