diff --git a/thermion_dart/pubspec.yaml b/thermion_dart/pubspec.yaml
index 6625a16e..6342fb30 100644
--- a/thermion_dart/pubspec.yaml
+++ b/thermion_dart/pubspec.yaml
@@ -5,7 +5,7 @@ homepage: https://thermion.dev
 repository: https://github.com/nmfisher/thermion
 
 environment:
-  sdk: ">=3.3.0 <4.0.0"
+  sdk: ">=3.5.0 <4.0.0"
 
 dependencies:
   vector_math: ^2.1.2
@@ -21,3 +21,4 @@ dependencies:
 dev_dependencies:
   ffigen: ^12.0.0
   test:
+  image:
\ No newline at end of file