diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index ad5e74f..880dbc3 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -20,7 +20,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        sdk: [2.12.0, dev]
+        sdk: [dev]
     steps:
       - uses: actions/checkout@v2
       - uses: dart-lang/setup-dart@v1.0
diff --git a/analysis_options.yaml b/analysis_options.yaml
index cf427a8..9a073e6 100644
--- a/analysis_options.yaml
+++ b/analysis_options.yaml
@@ -1,8 +1,8 @@
 include: package:lints/recommended.yaml
 
 analyzer:
-  strong-mode:
-    implicit-casts: false
+  language:
+    strict-casts: true
 
 linter:
   rules: