diff --git a/README.md b/README.md
index eb96919..19a7db2 100644
--- a/README.md
+++ b/README.md
@@ -49,5 +49,13 @@ For example, the mozjpeg optimizer is released on the package
 `thumbor-plugins-mozjpeg`, and the Gifv one on the package
 `thumbor-plugins-gifv`.
 
+
+## Third Party
+
+Integration tests uses a bug.png picture by [Marcelo Jorge Vieira][marcelometal]
+licensed under [CC-BY][cc-by].
+
+[cc-by]: https://creativecommons.org/licenses/by/2.0/
 [contributing]: https://github.com/thumbor/thumbor-plugins/blob/master/CONTRIBUTING.md
+[marcelometal]: https://www.flickr.com/photos/marcelometal/540719764/
 [thumbor]: https://github.com/thumbor/thumbor
diff --git a/thumbor_plugins/optimizers/optipng/tests/integration/imgs/bend.png b/thumbor_plugins/optimizers/optipng/tests/integration/imgs/bend.png
deleted file mode 100644
index 4b5bdaa..0000000
Binary files a/thumbor_plugins/optimizers/optipng/tests/integration/imgs/bend.png and /dev/null differ
diff --git a/thumbor_plugins/optimizers/optipng/tests/integration/imgs/bug.png b/thumbor_plugins/optimizers/optipng/tests/integration/imgs/bug.png
new file mode 100644
index 0000000..6d5fff0
Binary files /dev/null and b/thumbor_plugins/optimizers/optipng/tests/integration/imgs/bug.png differ
diff --git a/thumbor_plugins/optimizers/optipng/tests/integration/test_optipng.py b/thumbor_plugins/optimizers/optipng/tests/integration/test_optipng.py
index 3f970e2..0ad8ed9 100644
--- a/thumbor_plugins/optimizers/optipng/tests/integration/test_optipng.py
+++ b/thumbor_plugins/optimizers/optipng/tests/integration/test_optipng.py
@@ -11,5 +11,5 @@ class OptiPNG(EngineCase):
 
     @gen_test(timeout=30)
     async def test_optipng(self):
-        result = await self.http_client.fetch(self.get_url("/unsafe/bend.png"))
-        self.assert_result_smaller_than_original(result, "bend.png")
+        result = await self.http_client.fetch(self.get_url("/unsafe/bug.png"))
+        self.assert_result_smaller_than_original(result, "bug.png")
diff --git a/thumbor_plugins/optimizers/pngcrush/tests/integration/imgs/bend.png b/thumbor_plugins/optimizers/pngcrush/tests/integration/imgs/bend.png
deleted file mode 100644
index 4b5bdaa..0000000
Binary files a/thumbor_plugins/optimizers/pngcrush/tests/integration/imgs/bend.png and /dev/null differ
diff --git a/thumbor_plugins/optimizers/pngcrush/tests/integration/imgs/bug.png b/thumbor_plugins/optimizers/pngcrush/tests/integration/imgs/bug.png
new file mode 100644
index 0000000..6d5fff0
Binary files /dev/null and b/thumbor_plugins/optimizers/pngcrush/tests/integration/imgs/bug.png differ
diff --git a/thumbor_plugins/optimizers/pngcrush/tests/integration/test_pngcrush.py b/thumbor_plugins/optimizers/pngcrush/tests/integration/test_pngcrush.py
index c0ecf81..670b136 100644
--- a/thumbor_plugins/optimizers/pngcrush/tests/integration/test_pngcrush.py
+++ b/thumbor_plugins/optimizers/pngcrush/tests/integration/test_pngcrush.py
@@ -11,5 +11,5 @@ class PNGCrush(EngineCase):
 
     @gen_test
     async def test_pngcrush(self):
-        result = await self.http_client.fetch(self.get_url("/unsafe/bend.png"))
-        self.assert_result_smaller_than_original(result, "bend.png")
+        result = await self.http_client.fetch(self.get_url("/unsafe/bug.png"))
+        self.assert_result_smaller_than_original(result, "bug.png")
diff --git a/thumbor_plugins/optimizers/pngquant/tests/integration/imgs/bend.png b/thumbor_plugins/optimizers/pngquant/tests/integration/imgs/bend.png
deleted file mode 100644
index 4b5bdaa..0000000
Binary files a/thumbor_plugins/optimizers/pngquant/tests/integration/imgs/bend.png and /dev/null differ
diff --git a/thumbor_plugins/optimizers/pngquant/tests/integration/imgs/bug.png b/thumbor_plugins/optimizers/pngquant/tests/integration/imgs/bug.png
new file mode 100644
index 0000000..6d5fff0
Binary files /dev/null and b/thumbor_plugins/optimizers/pngquant/tests/integration/imgs/bug.png differ
diff --git a/thumbor_plugins/optimizers/pngquant/tests/integration/test_pngquant.py b/thumbor_plugins/optimizers/pngquant/tests/integration/test_pngquant.py
index 1b26f3e..f59e6aa 100644
--- a/thumbor_plugins/optimizers/pngquant/tests/integration/test_pngquant.py
+++ b/thumbor_plugins/optimizers/pngquant/tests/integration/test_pngquant.py
@@ -11,5 +11,5 @@ class PNGQuantTest(EngineCase):
 
     @gen_test
     async def test_pngquant(self):
-        result = await self.http_client.fetch(self.get_url("/unsafe/bend.png"))
-        self.assert_result_smaller_than_original(result, "bend.png")
+        result = await self.http_client.fetch(self.get_url("/unsafe/bug.png"))
+        self.assert_result_smaller_than_original(result, "bug.png")