drop beta container
diff --git a/pkgs/test_reflective_loader/.github/workflows/build.yaml b/pkgs/test_reflective_loader/.github/workflows/build.yaml
index 2ac7525..050ea78 100644
--- a/pkgs/test_reflective_loader/.github/workflows/build.yaml
+++ b/pkgs/test_reflective_loader/.github/workflows/build.yaml
@@ -13,9 +13,6 @@
   build:
     runs-on: ubuntu-latest
 
-    container:
-      image:  google/dart:beta
-
     steps:
       - uses: actions/checkout@v2