diff --git a/subprojects/packagefiles/ucd-trie-0.1-rs/meson.build b/subprojects/packagefiles/ucd-trie-0.1-rs/meson.build
index e8b14387d4a..20ba4d9d02c 100644
--- a/subprojects/packagefiles/ucd-trie-0.1-rs/meson.build
+++ b/subprojects/packagefiles/ucd-trie-0.1-rs/meson.build
@@ -8,7 +8,7 @@ project(
 lib = static_library(
   'ucd_trie',
   'src/lib.rs',
-  override_options : ['rust_std=2018', 'build.rust_std=2018'],
+  override_options : ['rust_std=2021', 'build.rust_std=2021'],
   rust_abi : 'rust',
   native : true,
 )