diff --git a/CHANGELOG.md b/CHANGELOG.md
index 6713db68e99805f980556b3b5dd0543ab01a13c9..d78e50d8ebdf89c71512502b8f602d827a0e8875 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,8 @@
 Changelog is kept at [GitHub](https://github.com/Dronehub/minijson/releases),
 here's only the changelog for the version in development
 
-# v1.7
+# v2.0
 
-* I totally forgot about booleans!
+* fixed a bug with serializing uint32a
+* major refactor
+    * backwards compatible 100%
diff --git a/minijson.pyx b/minijson.pyx
index 3408cbfbdf39b9be6df3e627a054944bf1c6e3ce..fa54d2a15dffa36f305eae1cd42394386257b205 100644
--- a/minijson.pyx
+++ b/minijson.pyx
@@ -359,8 +359,8 @@ cpdef int dump(object data, cio: io.BytesIO) except -1:
             cio.write(b'\x0C')
             cio.write(STRUCT_L.pack(data)[1:])
             return 4
-        elif 0 <= data <= 0xFFFFFFFF:       # unsigned int, type 6
-            cio.write(b'\x06')
+        elif 0 <= data <= 0xFFFFFFFF:       # unsigned int, type 4
+            cio.write(b'\x04')
             cio.write(STRUCT_L.pack(data))
             return 5
         else:
diff --git a/setup.py b/setup.py
index 3c79f247a10b8de1dec72299bbc6d57b4a6b1cad..3bb138ec0df96e3e78268ac0782750044a2c5b12 100644
--- a/setup.py
+++ b/setup.py
@@ -20,6 +20,6 @@ extensions = [Extension("minijson", ["minijson.pyx"],
     define_macros=macros),
 ]
 
-setup(version='1.7',
+setup(version='2.0rc1',
       ext_modules=cythonize(extensions),
       )
diff --git a/tests/test_minijson.py b/tests/test_minijson.py
index 3b275d9ff24fbb426e8b8160b87011af8d857820..e50c4a662e803b157d02898f68bbcb74f49d6580 100644
--- a/tests/test_minijson.py
+++ b/tests/test_minijson.py
@@ -97,7 +97,10 @@ class TestMiniJSON(unittest.TestCase):
         self.assertSameAfterDumpsAndLoads(-0x7FFF)
         self.assertSameAfterDumpsAndLoads(-0xFFFF)
         self.assertSameAfterDumpsAndLoads(0x1FFFF)
-        self.assertSameAfterDumpsAndLoads(0xFFFFFFFF)
+        b = dumps(0xFFFFFFFF)
+        print('Serialized to %s' % (b, ))
+        c = loads(b)
+        self.assertEqual(0xFFFFFFFF, c)
         self.assertSameAfterDumpsAndLoads(0x1FFFFFF)
         self.assertRaises(EncodingError, lambda: dumps(0xFFFFFFFFF))