diff --git a/pubspec.yaml b/pubspec.yaml
index df250f4..7eafe1e 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -4,7 +4,7 @@ version: 2.0.1
 homepage: https://github.com/ethicnology/dart-bip39-mnemonic
 
 environment:
-  sdk: '>=2.17.1 <3.0.0'
+  sdk: '>=2.16.1 <3.0.0'
 dev_dependencies:
   lints: ^2.0.0
   test: ^1.21.1