diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index 6f57efd..26b3a43 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -1,6 +1,12 @@
 Release History
 ===============
 
+0.9.2 (2019-04-04)
+------------------
+
+* updated Pillow dependency to version 6.0.0 in order to fix a bug when opening
+  some PNG files (https://github.com/python-pillow/Pillow/issues/3557).
+
 0.9.1 (2019-03-06)
 ------------------
 
diff --git a/Pipfile.lock b/Pipfile.lock
index b769e8d..4e7e0e4 100644
--- a/Pipfile.lock
+++ b/Pipfile.lock
@@ -41,39 +41,35 @@
         },
         "pillow": {
             "hashes": [
-                "sha256:051de330a06c99d6f84bcf582960487835bcae3fc99365185dc2d4f65a390c0e",
-                "sha256:0ae5289948c5e0a16574750021bd8be921c27d4e3527800dc9c2c1d2abc81bf7",
-                "sha256:0b1efce03619cdbf8bcc61cfae81fcda59249a469f31c6735ea59badd4a6f58a",
-                "sha256:163136e09bd1d6c6c6026b0a662976e86c58b932b964f255ff384ecc8c3cefa3",
-                "sha256:18e912a6ccddf28defa196bd2021fe33600cbe5da1aa2f2e2c6df15f720b73d1",
-                "sha256:24ec3dea52339a610d34401d2d53d0fb3c7fd08e34b20c95d2ad3973193591f1",
-                "sha256:267f8e4c0a1d7e36e97c6a604f5b03ef58e2b81c1becb4fccecddcb37e063cc7",
-                "sha256:3273a28734175feebbe4d0a4cde04d4ed20f620b9b506d26f44379d3c72304e1",
-                "sha256:4c678e23006798fc8b6f4cef2eaad267d53ff4c1779bd1af8725cc11b72a63f3",
-                "sha256:4d4bc2e6bb6861103ea4655d6b6f67af8e5336e7216e20fff3e18ffa95d7a055",
-                "sha256:505738076350a337c1740a31646e1de09a164c62c07db3b996abdc0f9d2e50cf",
-                "sha256:5233664eadfa342c639b9b9977190d64ad7aca4edc51a966394d7e08e7f38a9f",
-                "sha256:5d95cb9f6cced2628f3e4de7e795e98b2659dfcc7176ab4a01a8b48c2c2f488f",
-                "sha256:7eda4c737637af74bac4b23aa82ea6fbb19002552be85f0b89bc27e3a762d239",
-                "sha256:801ddaa69659b36abf4694fed5aa9f61d1ecf2daaa6c92541bbbbb775d97b9fe",
-                "sha256:825aa6d222ce2c2b90d34a0ea31914e141a85edefc07e17342f1d2fdf121c07c",
-                "sha256:9c215442ff8249d41ff58700e91ef61d74f47dfd431a50253e1a1ca9436b0697",
-                "sha256:a3d90022f2202bbb14da991f26ca7a30b7e4c62bf0f8bf9825603b22d7e87494",
-                "sha256:a631fd36a9823638fe700d9225f9698fb59d049c942d322d4c09544dc2115356",
-                "sha256:a6523a23a205be0fe664b6b8747a5c86d55da960d9586db039eec9f5c269c0e6",
-                "sha256:a756ecf9f4b9b3ed49a680a649af45a8767ad038de39e6c030919c2f443eb000",
-                "sha256:b117287a5bdc81f1bac891187275ec7e829e961b8032c9e5ff38b70fd036c78f",
-                "sha256:ba04f57d1715ca5ff74bb7f8a818bf929a204b3b3c2c2826d1e1cc3b1c13398c",
-                "sha256:cd878195166723f30865e05d87cbaf9421614501a4bd48792c5ed28f90fd36ca",
-                "sha256:cee815cc62d136e96cf76771b9d3eb58e0777ec18ea50de5cfcede8a7c429aa8",
-                "sha256:d1722b7aa4b40cf93ac3c80d3edd48bf93b9208241d166a14ad8e7a20ee1d4f3",
-                "sha256:d7c1c06246b05529f9984435fc4fa5a545ea26606e7f450bdbe00c153f5aeaad",
-                "sha256:e9c8066249c040efdda84793a2a669076f92a301ceabe69202446abb4c5c5ef9",
-                "sha256:f227d7e574d050ff3996049e086e1f18c7bd2d067ef24131e50a1d3fe5831fbc",
-                "sha256:fc9a12aad714af36cf3ad0275a96a733526571e52710319855628f476dcb144e"
+                "sha256:15c056bfa284c30a7f265a41ac4cbbc93bdbfc0dfe0613b9cb8a8581b51a9e55",
+                "sha256:1a4e06ba4f74494ea0c58c24de2bb752818e9d504474ec95b0aa94f6b0a7e479",
+                "sha256:1c3c707c76be43c9e99cb7e3d5f1bee1c8e5be8b8a2a5eeee665efbf8ddde91a",
+                "sha256:1fd0b290203e3b0882d9605d807b03c0f47e3440f97824586c173eca0aadd99d",
+                "sha256:24114e4a6e1870c5a24b1da8f60d0ba77a0b4027907860188ea82bd3508c80eb",
+                "sha256:258d886a49b6b058cd7abb0ab4b2b85ce78669a857398e83e8b8e28b317b5abb",
+                "sha256:33c79b6dd6bc7f65079ab9ca5bebffb5f5d1141c689c9c6a7855776d1b09b7e8",
+                "sha256:367385fc797b2c31564c427430c7a8630db1a00bd040555dfc1d5c52e39fcd72",
+                "sha256:3c1884ff078fb8bf5f63d7d86921838b82ed4a7d0c027add773c2f38b3168754",
+                "sha256:44e5240e8f4f8861d748f2a58b3f04daadab5e22bfec896bf5434745f788f33f",
+                "sha256:46aa988e15f3ea72dddd81afe3839437b755fffddb5e173886f11460be909dce",
+                "sha256:74d90d499c9c736d52dd6d9b7221af5665b9c04f1767e35f5dd8694324bd4601",
+                "sha256:809c0a2ce9032cbcd7b5313f71af4bdc5c8c771cb86eb7559afd954cab82ebb5",
+                "sha256:85d1ef2cdafd5507c4221d201aaf62fc9276f8b0f71bd3933363e62a33abc734",
+                "sha256:8c3889c7681af77ecfa4431cd42a2885d093ecb811e81fbe5e203abc07e0995b",
+                "sha256:9218d81b9fca98d2c47d35d688a0cea0c42fd473159dfd5612dcb0483c63e40b",
+                "sha256:9aa4f3827992288edd37c9df345783a69ef58bd20cc02e64b36e44bcd157bbf1",
+                "sha256:9d80f44137a70b6f84c750d11019a3419f409c944526a95219bea0ac31f4dd91",
+                "sha256:b7ebd36128a2fe93991293f997e44be9286503c7530ace6a55b938b20be288d8",
+                "sha256:c4c78e2c71c257c136cdd43869fd3d5e34fc2162dc22e4a5406b0ebe86958239",
+                "sha256:c6a842537f887be1fe115d8abb5daa9bc8cc124e455ff995830cc785624a97af",
+                "sha256:cf0a2e040fdf5a6d95f4c286c6ef1df6b36c218b528c8a9158ec2452a804b9b8",
+                "sha256:cfd28aad6fc61f7a5d4ee556a997dc6e5555d9381d1390c00ecaf984d57e4232",
+                "sha256:dca5660e25932771460d4688ccbb515677caaf8595f3f3240ec16c117deff89a",
+                "sha256:de7aedc85918c2f887886442e50f52c1b93545606317956d65f342bd81cb4fc3",
+                "sha256:e6c0bbf8e277b74196e3140c35f9a1ae3eafd818f7f2d3a15819c49135d6c062"
             ],
             "index": "pypi",
-            "version": "==5.4.1"
+            "version": "==6.0.0"
         }
     },
     "develop": {
@@ -86,10 +82,10 @@
         },
         "certifi": {
             "hashes": [
-                "sha256:47f9c83ef4c0c621eaef743f133f09fa8a74a9b75f037e8624f83bd1b6626cb7",
-                "sha256:993f830721089fef441cdfeb4b2c8c9df86f0c63239f06bd025a76a7daddb033"
+                "sha256:59b7658e26ca9c7339e00f8f4636cdfe59d34fa37b9b04f6f9e9926b3cece1a5",
+                "sha256:b26104d6835d1f5e49452a26eb2ff87fe7090b89dfcaee5ea2212697e1e1d7ae"
             ],
-            "version": "==2018.11.29"
+            "version": "==2019.3.9"
         },
         "chardet": {
             "hashes": [
@@ -100,48 +96,48 @@
         },
         "coverage": {
             "hashes": [
-                "sha256:09e47c529ff77bf042ecfe858fb55c3e3eb97aac2c87f0349ab5a7efd6b3939f",
-                "sha256:0a1f9b0eb3aa15c990c328535655847b3420231af299386cfe5efc98f9c250fe",
-                "sha256:0cc941b37b8c2ececfed341444a456912e740ecf515d560de58b9a76562d966d",
-                "sha256:10e8af18d1315de936d67775d3a814cc81d0747a1a0312d84e27ae5610e313b0",
-                "sha256:1b4276550b86caa60606bd3572b52769860a81a70754a54acc8ba789ce74d607",
-                "sha256:1e8a2627c48266c7b813975335cfdea58c706fe36f607c97d9392e61502dc79d",
-                "sha256:2b224052bfd801beb7478b03e8a66f3f25ea56ea488922e98903914ac9ac930b",
-                "sha256:447c450a093766744ab53bf1e7063ec82866f27bcb4f4c907da25ad293bba7e3",
-                "sha256:46101fc20c6f6568561cdd15a54018bb42980954b79aa46da8ae6f008066a30e",
-                "sha256:4710dc676bb4b779c4361b54eb308bc84d64a2fa3d78e5f7228921eccce5d815",
-                "sha256:510986f9a280cd05189b42eee2b69fecdf5bf9651d4cd315ea21d24a964a3c36",
-                "sha256:5535dda5739257effef56e49a1c51c71f1d37a6e5607bb25a5eee507c59580d1",
-                "sha256:5a7524042014642b39b1fcae85fb37556c200e64ec90824ae9ecf7b667ccfc14",
-                "sha256:5f55028169ef85e1fa8e4b8b1b91c0b3b0fa3297c4fb22990d46ff01d22c2d6c",
-                "sha256:6694d5573e7790a0e8d3d177d7a416ca5f5c150742ee703f3c18df76260de794",
-                "sha256:6831e1ac20ac52634da606b658b0b2712d26984999c9d93f0c6e59fe62ca741b",
-                "sha256:77f0d9fa5e10d03aa4528436e33423bfa3718b86c646615f04616294c935f840",
-                "sha256:828ad813c7cdc2e71dcf141912c685bfe4b548c0e6d9540db6418b807c345ddd",
-                "sha256:85a06c61598b14b015d4df233d249cd5abfa61084ef5b9f64a48e997fd829a82",
-                "sha256:8cb4febad0f0b26c6f62e1628f2053954ad2c555d67660f28dfb1b0496711952",
-                "sha256:a5c58664b23b248b16b96253880b2868fb34358911400a7ba39d7f6399935389",
-                "sha256:aaa0f296e503cda4bc07566f592cd7a28779d433f3a23c48082af425d6d5a78f",
-                "sha256:ab235d9fe64833f12d1334d29b558aacedfbca2356dfb9691f2d0d38a8a7bfb4",
-                "sha256:b3b0c8f660fae65eac74fbf003f3103769b90012ae7a460863010539bb7a80da",
-                "sha256:bab8e6d510d2ea0f1d14f12642e3f35cefa47a9b2e4c7cea1852b52bc9c49647",
-                "sha256:c45297bbdbc8bb79b02cf41417d63352b70bcb76f1bbb1ee7d47b3e89e42f95d",
-                "sha256:d19bca47c8a01b92640c614a9147b081a1974f69168ecd494687c827109e8f42",
-                "sha256:d64b4340a0c488a9e79b66ec9f9d77d02b99b772c8b8afd46c1294c1d39ca478",
-                "sha256:da969da069a82bbb5300b59161d8d7c8d423bc4ccd3b410a9b4d8932aeefc14b",
-                "sha256:ed02c7539705696ecb7dc9d476d861f3904a8d2b7e894bd418994920935d36bb",
-                "sha256:ee5b8abc35b549012e03a7b1e86c09491457dba6c94112a2482b18589cc2bdb9"
+                "sha256:3684fabf6b87a369017756b551cef29e505cb155ddb892a7a29277b978da88b9",
+                "sha256:39e088da9b284f1bd17c750ac672103779f7954ce6125fd4382134ac8d152d74",
+                "sha256:3c205bc11cc4fcc57b761c2da73b9b72a59f8d5ca89979afb0c1c6f9e53c7390",
+                "sha256:465ce53a8c0f3a7950dfb836438442f833cf6663d407f37d8c52fe7b6e56d7e8",
+                "sha256:48020e343fc40f72a442c8a1334284620f81295256a6b6ca6d8aa1350c763bbe",
+                "sha256:5296fc86ab612ec12394565c500b412a43b328b3907c0d14358950d06fd83baf",
+                "sha256:5f61bed2f7d9b6a9ab935150a6b23d7f84b8055524e7be7715b6513f3328138e",
+                "sha256:68a43a9f9f83693ce0414d17e019daee7ab3f7113a70c79a3dd4c2f704e4d741",
+                "sha256:6b8033d47fe22506856fe450470ccb1d8ba1ffb8463494a15cfc96392a288c09",
+                "sha256:7ad7536066b28863e5835e8cfeaa794b7fe352d99a8cded9f43d1161be8e9fbd",
+                "sha256:7bacb89ccf4bedb30b277e96e4cc68cd1369ca6841bde7b005191b54d3dd1034",
+                "sha256:839dc7c36501254e14331bcb98b27002aa415e4af7ea039d9009409b9d2d5420",
+                "sha256:8f9a95b66969cdea53ec992ecea5406c5bd99c9221f539bca1e8406b200ae98c",
+                "sha256:932c03d2d565f75961ba1d3cec41ddde00e162c5b46d03f7423edcb807734eab",
+                "sha256:988529edadc49039d205e0aa6ce049c5ccda4acb2d6c3c5c550c17e8c02c05ba",
+                "sha256:998d7e73548fe395eeb294495a04d38942edb66d1fa61eb70418871bc621227e",
+                "sha256:9de60893fb447d1e797f6bf08fdf0dbcda0c1e34c1b06c92bd3a363c0ea8c609",
+                "sha256:9e80d45d0c7fcee54e22771db7f1b0b126fb4a6c0a2e5afa72f66827207ff2f2",
+                "sha256:a545a3dfe5082dc8e8c3eb7f8a2cf4f2870902ff1860bd99b6198cfd1f9d1f49",
+                "sha256:a5d8f29e5ec661143621a8f4de51adfb300d7a476224156a39a392254f70687b",
+                "sha256:aca06bfba4759bbdb09bf52ebb15ae20268ee1f6747417837926fae990ebc41d",
+                "sha256:bb23b7a6fd666e551a3094ab896a57809e010059540ad20acbeec03a154224ce",
+                "sha256:bfd1d0ae7e292105f29d7deaa9d8f2916ed8553ab9d5f39ec65bcf5deadff3f9",
+                "sha256:c62ca0a38958f541a73cf86acdab020c2091631c137bd359c4f5bddde7b75fd4",
+                "sha256:c709d8bda72cf4cd348ccec2a4881f2c5848fd72903c185f363d361b2737f773",
+                "sha256:c968a6aa7e0b56ecbd28531ddf439c2ec103610d3e2bf3b75b813304f8cb7723",
+                "sha256:df785d8cb80539d0b55fd47183264b7002077859028dfe3070cf6359bf8b2d9c",
+                "sha256:f406628ca51e0ae90ae76ea8398677a921b36f0bd71aab2099dfed08abd0322f",
+                "sha256:f46087bbd95ebae244a0eda01a618aff11ec7a069b15a3ef8f6b520db523dcf1",
+                "sha256:f8019c5279eb32360ca03e9fac40a12667715546eed5c5eb59eb381f2f501260",
+                "sha256:fc5f4d209733750afd2714e9109816a29500718b32dd9a5db01c0cb3a019b96a"
             ],
             "index": "pypi",
-            "version": "==4.5.2"
+            "version": "==4.5.3"
         },
         "coveralls": {
             "hashes": [
-                "sha256:6f213e461390973f4a97fb9e9d4ebd4956af296ff0a4d868e622108145835cb7",
-                "sha256:a7d0078c9e9b5692c03dcd3884647e837836c265c01e98094632feadef767d36"
+                "sha256:baa26648430d5c2225ab12d7e2067f75597a4b967034bba7e3d5ab7501d207a1",
+                "sha256:ff9b7823b15070f26f654837bb02a201d006baaf2083e0514ffd3b34a3ffed81"
             ],
             "index": "pypi",
-            "version": "==1.6.0"
+            "version": "==1.7.0"
         },
         "docopt": {
             "hashes": [
@@ -166,11 +162,20 @@
         },
         "mypy": {
             "hashes": [
-                "sha256:308c274eb8482fbf16006f549137ddc0d69e5a589465e37b99c4564414363ca7",
-                "sha256:e80fd6af34614a0e898a57f14296d0dacb584648f0339c2e000ddbf0f4cc2f8d"
+                "sha256:03261a04ace27250cf14f1301969e2cc36ad0343dd437e60007ce42f06ddbaff",
+                "sha256:6a7923e90dd8f8b8e762327e3a4dd814f0bc5581a627010f4e2ec72d906ada0f",
+                "sha256:6a7c2b16ff7dee1cd4a913641d6a8da0cd386be812524f41427ea25f8fe337a6",
+                "sha256:7480db0bc2bb473547c8d519ea549de9f9654170e6f5b34310094ebe5ee1c9dc",
+                "sha256:863774c896f2cdc62a0e2252e9ba7aaeb7da04c0296f47c82b125dce3437c580",
+                "sha256:9a990cf039891a83ee90f130256cc06d09c0793242ea38d0fe33fdc449507123",
+                "sha256:b03573d0cd8c051aa9ef7f47d564cf44bbc5e91e89a7a078b3ca904b3da8855a",
+                "sha256:b10b16d9aa7a01266f14260344fb25849ef0d508c512a916043f77987489aeff",
+                "sha256:b1eab82221c3cc94bf22152e701b3efc9d64f60fac4cab20969a0427e5a78261",
+                "sha256:e663d4424531dc99fb85c947df8a4a107442f53f20a4e0bcefaa1d21c87e1563",
+                "sha256:ffac30f3fa2c9e10118cbb0faa0b7da7edb6e3c24a4048a15446a1f3409884e3"
             ],
             "index": "pypi",
-            "version": "==0.670"
+            "version": "==0.700"
         },
         "mypy-extensions": {
             "hashes": [
diff --git a/setup.py b/setup.py
index 04e492b..2d20718 100644
--- a/setup.py
+++ b/setup.py
@@ -33,7 +33,7 @@ with codecs.open(os.path.join(here, 'CHANGELOG.rst'), encoding='utf-8') as f:
 
 setup(
     name='Stegano',
-    version='0.9.1',
+    version='0.9.2',
     author='Cédric Bonhomme',
     author_email='cedric@cedricbonhomme.org',
     packages=packages,