diff --git a/lib/sentry.dart b/lib/sentry.dart
index ccf20f884b..e75b163acd 100644
--- a/lib/sentry.dart
+++ b/lib/sentry.dart
@@ -197,7 +197,7 @@ class SentryClient {
     List<int> body = utf8.encode(json.encode(data));
     if (compressPayload) {
       headers['Content-Encoding'] = 'gzip';
-      body = GZIP.encode(body);
+      body = gzip.encode(body);
     }
 
     final Response response =
diff --git a/test/sentry_test.dart b/test/sentry_test.dart
index 1a61518ed1..6dc563d1ad 100644
--- a/test/sentry_test.dart
+++ b/test/sentry_test.dart
@@ -151,12 +151,12 @@ void main() {
 
       Map<String, dynamic> data;
       if (compressPayload) {
-        data = json.decode(utf8.decode(GZIP.decode(body)));
+        data = json.decode(utf8.decode(gzip.decode(body)));
       } else {
         data = json.decode(utf8.decode(body));
       }
       final Map<String, dynamic> stacktrace = data.remove('stacktrace');
-      expect(stacktrace['frames'], const isInstanceOf<List>());
+      expect(stacktrace['frames'], const TypeMatcher<List>());
       expect(stacktrace['frames'], isNotEmpty);
 
       final Map<String, dynamic> topFrame =