diff --git a/pubspec.yaml b/pubspec.yaml
index a8b4b18..9f2276c 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -4,7 +4,7 @@ description: Font load events, simple, small and efficient. Dart port of https:/
 homepage: https://github.com/Workiva/font_face_observer
 
 environment:
-  sdk: '>=2.12.0 <3.0.0'
+  sdk: '>=2.19.0 <3.0.0'
 
 dev_dependencies:
   build_runner: ^2.0.0