diff --git a/lib/src/algorithms.dart b/lib/src/algorithms.dart
index cb205c7..58567e5 100644
--- a/lib/src/algorithms.dart
+++ b/lib/src/algorithms.dart
@@ -1,4 +1,5 @@
 import 'dart:math';
+
 import 'package:image/image.dart';
 
 /// Abstract class for all algorithms
@@ -309,7 +310,7 @@ class IMED extends DirectAlgorithm {
   }
 
   /// Helper function to return grayscale value of a pixel
-  int _grayValue(Pixel p) {
+  num _grayValue(Pixel p) {
     return getLuminanceRgb(p._red, p._green, p._blue);
   }
 
@@ -660,7 +661,7 @@ class RGBAHistogram {
     redHist = List.filled(_binSize, 0.0);
     greenHist = List.filled(_binSize, 0.0);
     blueHist = List.filled(_binSize, 0.0);
-    alphaHist = List.filled(_binSize, 0.0); 
+    alphaHist = List.filled(_binSize, 0.0);
   }
 }
 
@@ -694,7 +695,7 @@ class ChiSquareDistanceHistogram extends HistogramAlgorithm {
 
     sum += _diff(_histograms._first.redHist, _histograms._second.redHist) +
         _diff(_histograms._first.greenHist, _histograms._second.greenHist) +
-        _diff(_histograms._first.blueHist, _histograms._second.blueHist) + 
+        _diff(_histograms._first.blueHist, _histograms._second.blueHist) +
         (alphaBit * _diff(_histograms._first.alphaHist, _histograms._second.alphaHist));
 
     return sum / (3 + alphaBit);
@@ -756,7 +757,7 @@ class IntersectionHistogram extends HistogramAlgorithm {
 
     sum += _diff(_histograms._first.redHist, _histograms._second.redHist) +
         _diff(_histograms._first.greenHist, _histograms._second.greenHist) +
-        _diff(_histograms._first.blueHist, _histograms._second.blueHist) + 
+        _diff(_histograms._first.blueHist, _histograms._second.blueHist) +
         (alphaBit * _diff(_histograms._first.alphaHist, _histograms._second.alphaHist));
 
     return 1 - (sum / (3 + alphaBit));
diff --git a/lib/src/functions.dart b/lib/src/functions.dart
index b9ff66d..d2693d9 100644
--- a/lib/src/functions.dart
+++ b/lib/src/functions.dart
@@ -1,7 +1,10 @@
-import 'algorithms.dart';
+import 'dart:typed_data';
+
 import 'package:image/image.dart';
 import 'package:universal_io/io.dart';
 
+import 'algorithms.dart';
+
 /// Compare images from [src1] and [src2] with a specified [algorithm].
 /// If [algorithm] is not specified, the default (PixelMatching()) is supplied.
 ///
@@ -90,7 +93,7 @@ Future<Image> _getImageFromDynamic(var src) async {
   } else if (src is Image) {
     err += '$src. $src.data.length != width * height';
 
-    if (src.height * src.width != src.data.length) {
+    if (src.height * src.width != src.data?.length) {
       throw FormatException(err);
     }
 
@@ -111,7 +114,7 @@ Future<Image> _getImageFromDynamic(var src) async {
 Image _getValidImage(List<int> bytes, String err) {
   var image;
   try {
-    image = decodeImage(bytes);
+    image = decodeImage(Uint8List.fromList(bytes));
   } catch (Exception) {
     throw FormatException("Insufficient data provided to identify image.");
   }
diff --git a/pubspec.lock b/pubspec.lock
index 0e94cc2..a1f89f4 100644
--- a/pubspec.lock
+++ b/pubspec.lock
@@ -14,7 +14,7 @@ packages:
       name: collection
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.15.0"
+    version: "1.17.0"
   crypto:
     dependency: transitive
     description:
@@ -28,14 +28,14 @@ packages:
       name: image
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "3.0.2"
+    version: "4.0.12"
   meta:
     dependency: transitive
     description:
       name: meta
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.4.0"
+    version: "1.8.0"
   path:
     dependency: transitive
     description:
@@ -56,7 +56,7 @@ packages:
       name: petitparser
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "4.1.0"
+    version: "5.1.0"
   typed_data:
     dependency: transitive
     description:
@@ -77,6 +77,6 @@ packages:
       name: xml
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "5.1.2"
+    version: "6.2.2"
 sdks:
-  dart: ">=2.12.0 <3.0.0"
+  dart: ">=2.18.0 <3.0.0"
diff --git a/pubspec.yaml b/pubspec.yaml
index 5bf0fc5..ae7e573 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -4,14 +4,14 @@ repository: https://github.com/nitinramadoss/image_compare
 version: 1.1.2
 
 environment:
-  sdk: ">=2.12.0 <3.0.0"
+  sdk: ">=2.18.0 <3.0.0"
 
 dependencies:
-  image: ^3.0.0
-  universal_io: ^2.0.0
+  image: ^4.0.12
+  universal_io: ^2.0.4
 
 dev_dependencies:
-  pedantic: ^1.9.0
+  pedantic: ^1.11.1
 
 assets:
   - assets/