diff --git a/CHANGELOG.md b/CHANGELOG.md
index 51e41bfb..2841622e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,4 +1,7 @@
-## [0.3.0] - 2nd Aug 2021
+## [0.3.1] - 20nd Aug 2021
+- hotfix: Opt-out null safety for crypto files because of an error in web
+
+## [0.3.0] - 20nd Aug 2021
 - remove: deprecated moor database (breaking change)
 - feat(events): add plain-text body representation from HTML
 - feat: get new_content in getLocalizedBody
diff --git a/lib/src/utils/crypto/crypto.dart b/lib/src/utils/crypto/crypto.dart
index 7bbddf80..a0cef89e 100644
--- a/lib/src/utils/crypto/crypto.dart
+++ b/lib/src/utils/crypto/crypto.dart
@@ -1,3 +1,4 @@
+// @dart=2.9
 /*
  *   Famedly Matrix SDK
  *   Copyright (C) 2019, 2020, 2021 Famedly GmbH
diff --git a/lib/src/utils/crypto/ffi.dart b/lib/src/utils/crypto/ffi.dart
index 0cb79266..e5f787de 100644
--- a/lib/src/utils/crypto/ffi.dart
+++ b/lib/src/utils/crypto/ffi.dart
@@ -1,3 +1,4 @@
+// @dart=2.9
 /*
  *   Famedly Matrix SDK
  *   Copyright (C) 2019, 2020, 2021 Famedly GmbH
diff --git a/lib/src/utils/crypto/native.dart b/lib/src/utils/crypto/native.dart
index ce317859..476f2207 100644
--- a/lib/src/utils/crypto/native.dart
+++ b/lib/src/utils/crypto/native.dart
@@ -1,3 +1,4 @@
+// @dart=2.9
 import 'dart:async';
 import 'dart:typed_data';
 import 'dart:ffi';
diff --git a/pubspec.yaml b/pubspec.yaml
index 81541142..7b2caa3c 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,6 +1,6 @@
 name: matrix
 description: Matrix Dart SDK
-version: 0.3.0
+version: 0.3.1
 homepage: https://famedly.com
 
 environment: