diff --git a/.github/workflows/dart.yml b/.github/workflows/dart.yml
new file mode 100644
index 0000000..7916361
--- /dev/null
+++ b/.github/workflows/dart.yml
@@ -0,0 +1,62 @@
+name: Dart Package
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v2
+      - uses: dart-lang/setup-dart@v1
+
+      - name: Install dependencies
+        run: dart pub get
+
+      - name: Verify formatting
+        run: dart format --output=none --set-exit-if-changed .
+
+      - name: Analyze project source
+        run: dart analyze --fatal-warnings --fatal-infos --verbose .
+
+      - name: Activate code coverage
+        run: pub global activate dart_coveralls
+
+      - name: Analyze code coverage
+        run: dart_coveralls report --debug --exclude-test-files --token=$COVERALLS_REPO_TOKEN test/all_test.dart
+
+  test:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest]
+        sdk: [stable, 2.12.0, 2.13.1]
+    steps:
+      - uses: actions/checkout@v2
+      - uses: dart-lang/setup-dart@v1.0
+        with:
+          sdk: ${{ matrix.sdk }}
+
+      - name: Install dependencies
+        run: dart pub get
+
+      - name: Run tests
+        run: dart test
+
+  deploy:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v2
+      - uses: dart-lang/setup-dart@v1
+
+      - name: Install dependencies
+        run: dart pub get
+
+      - name: Publish project
+        run: pub publish --dry-run
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 6b14d70..ec74cc9 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 2.0.0
+
+* BREAKING CHANGE: This version requires Dart SDK 2.12.0 or later (null safety).
+
 ## 1.1.0+2
 
 - fix PolygonUtils.simplify
diff --git a/README.md b/README.md
index 37f8003..3579466 100644
--- a/README.md
+++ b/README.md
@@ -19,7 +19,7 @@ In your dart/flutter project add the dependency:
 ```
  dependencies:
    ...
-   maps_toolkit: ^1.1.0+2
+   maps_toolkit: ^2.0.0
 ```
 
 A simple usage example:
diff --git a/analysis_options.yaml b/analysis_options.yaml
index 21bc8cc..4532cbb 100644
--- a/analysis_options.yaml
+++ b/analysis_options.yaml
@@ -9,7 +9,6 @@ linter:
     # - always_specify_types
     - annotate_overrides
     - avoid_annotating_with_dynamic
-    - avoid_as
     - avoid_bool_literals_in_conditional_expressions
     - avoid_catches_without_on_clauses
     - avoid_catching_errors
diff --git a/pubspec.yaml b/pubspec.yaml
index 76f42a8..90b3efb 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -4,10 +4,10 @@ version: 2.0.0
 homepage: https://github.com/kb0/maps_toolkit/
 
 environment:
-  sdk: ">=2.12.0-0 <3.0.0"
+  sdk: ">=2.12.0 <3.0.0"
 
 dependencies:
 
 dev_dependencies:
-  test: any
   pedantic: '>=1.8.0 <3.0.0'
+  test: any