Update dev deps to latest
diff --git a/pubspec.yaml b/pubspec.yaml
index fb7a3a8..1bf6a8e 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -12,5 +12,5 @@
   async: '>=1.2.0 <3.0.0'
 
 dev_dependencies:
-  http: '>=0.11.0 <0.12.0'
-  test: '>=0.12.0 <2.0.0'
+  http: ^0.12.0
+  test: ^1.5.2