diff --git a/CHANGELOG.md b/CHANGELOG.md
index cd0c4a3..16328d1 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,11 @@
 ## Release History
 
 
+### 0.9.9 (2021-07-02)
+
+* stegano now uses Pillow 8.3.0.
+
+
 ### 0.9.8 (2019-12-20)
 
 * stegano is now using poetry;
diff --git a/poetry.lock b/poetry.lock
index 4c1be94..bbf80e3 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -8,7 +8,7 @@ python-versions = "*"
 
 [[package]]
 name = "babel"
-version = "2.9.0"
+version = "2.9.1"
 description = "Internationalization utilities"
 category = "dev"
 optional = false
@@ -19,7 +19,7 @@ pytz = ">=2015.7"
 
 [[package]]
 name = "certifi"
-version = "2020.12.5"
+version = "2021.5.30"
 description = "Python package for providing Mozilla's CA Bundle."
 category = "dev"
 optional = false
@@ -65,7 +65,7 @@ colorama = "*"
 
 [[package]]
 name = "docutils"
-version = "0.17"
+version = "0.16"
 description = "Docutils -- Python Documentation Utilities"
 category = "dev"
 optional = false
@@ -73,7 +73,7 @@ python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
 
 [[package]]
 name = "flake8"
-version = "3.9.0"
+version = "3.9.2"
 description = "the modular source code checker: pep8 pyflakes and co"
 category = "dev"
 optional = false
@@ -103,7 +103,7 @@ python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
 
 [[package]]
 name = "importlib-metadata"
-version = "3.10.0"
+version = "4.6.0"
 description = "Read metadata from Python packages"
 category = "dev"
 optional = false
@@ -115,29 +115,30 @@ zipp = ">=0.5"
 
 [package.extras]
 docs = ["sphinx", "jaraco.packaging (>=8.2)", "rst.linker (>=1.9)"]
-testing = ["pytest (>=4.6)", "pytest-checkdocs (>=2.4)", "pytest-flake8", "pytest-cov", "pytest-enabler (>=1.0.1)", "packaging", "pep517", "pyfakefs", "flufl.flake8", "pytest-black (>=0.3.7)", "pytest-mypy", "importlib-resources (>=1.3)"]
+perf = ["ipython"]
+testing = ["pytest (>=4.6)", "pytest-checkdocs (>=2.4)", "pytest-flake8", "pytest-cov", "pytest-enabler (>=1.0.1)", "packaging", "pep517", "pyfakefs", "flufl.flake8", "pytest-perf (>=0.9.2)", "pytest-black (>=0.3.7)", "pytest-mypy", "importlib-resources (>=1.3)"]
 
 [[package]]
 name = "jinja2"
-version = "2.11.3"
+version = "3.0.1"
 description = "A very fast and expressive template engine."
 category = "dev"
 optional = false
-python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
+python-versions = ">=3.6"
 
 [package.dependencies]
-MarkupSafe = ">=0.23"
+MarkupSafe = ">=2.0"
 
 [package.extras]
-i18n = ["Babel (>=0.8)"]
+i18n = ["Babel (>=2.7)"]
 
 [[package]]
 name = "markupsafe"
-version = "1.1.1"
+version = "2.0.1"
 description = "Safely add untrusted strings to HTML/XML markup."
 category = "dev"
 optional = false
-python-versions = ">=2.7,!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*"
+python-versions = ">=3.6"
 
 [[package]]
 name = "mccabe"
@@ -208,7 +209,7 @@ python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
 
 [[package]]
 name = "pillow"
-version = "8.2.0"
+version = "8.3.0"
 description = "Python Imaging Library (Fork)"
 category = "main"
 optional = false
@@ -232,7 +233,7 @@ python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
 
 [[package]]
 name = "pygments"
-version = "2.8.1"
+version = "2.9.0"
 description = "Pygments is a syntax highlighting package written in Python."
 category = "dev"
 optional = false
@@ -274,7 +275,7 @@ socks = ["PySocks (>=1.5.6,!=1.5.7)", "win-inet-pton"]
 
 [[package]]
 name = "six"
-version = "1.15.0"
+version = "1.16.0"
 description = "Python 2 and 3 compatibility utilities"
 category = "dev"
 optional = false
@@ -290,7 +291,7 @@ python-versions = "*"
 
 [[package]]
 name = "sphinx"
-version = "3.5.3"
+version = "3.5.4"
 description = "Python documentation generator"
 category = "dev"
 optional = false
@@ -300,7 +301,7 @@ python-versions = ">=3.5"
 alabaster = ">=0.7,<0.8"
 babel = ">=1.3"
 colorama = {version = ">=0.3.5", markers = "sys_platform == \"win32\""}
-docutils = ">=0.12"
+docutils = ">=0.12,<0.17"
 imagesize = "*"
 Jinja2 = ">=2.3"
 packaging = "*"
@@ -345,11 +346,11 @@ test = ["pytest"]
 
 [[package]]
 name = "sphinxcontrib-htmlhelp"
-version = "1.0.3"
+version = "2.0.0"
 description = "sphinxcontrib-htmlhelp is a sphinx extension which renders HTML help files"
 category = "dev"
 optional = false
-python-versions = ">=3.5"
+python-versions = ">=3.6"
 
 [package.extras]
 lint = ["flake8", "mypy", "docutils-stubs"]
@@ -380,7 +381,7 @@ test = ["pytest"]
 
 [[package]]
 name = "sphinxcontrib-serializinghtml"
-version = "1.1.4"
+version = "1.1.5"
 description = "sphinxcontrib-serializinghtml is a sphinx extension which outputs \"serialized\" HTML files (json and pickle)."
 category = "dev"
 optional = false
@@ -392,7 +393,7 @@ test = ["pytest"]
 
 [[package]]
 name = "typed-ast"
-version = "1.4.2"
+version = "1.4.3"
 description = "a fork of Python 2 and 3 ast modules with type comment support"
 category = "dev"
 optional = false
@@ -400,7 +401,7 @@ python-versions = "*"
 
 [[package]]
 name = "typing-extensions"
-version = "3.7.4.3"
+version = "3.10.0.0"
 description = "Backported and Experimental Type Hints for Python 3.5+"
 category = "dev"
 optional = false
@@ -408,16 +409,16 @@ python-versions = "*"
 
 [[package]]
 name = "urllib3"
-version = "1.26.4"
+version = "1.26.6"
 description = "HTTP library with thread-safe connection pooling, file post, and more."
 category = "dev"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*, <4"
 
 [package.extras]
+brotli = ["brotlipy (>=0.6.0)"]
 secure = ["pyOpenSSL (>=0.14)", "cryptography (>=1.3.4)", "idna (>=2.0.0)", "certifi", "ipaddress"]
 socks = ["PySocks (>=1.5.6,!=1.5.7,<2.0)"]
-brotli = ["brotlipy (>=0.6.0)"]
 
 [[package]]
 name = "zipp"
@@ -442,12 +443,12 @@ alabaster = [
     {file = "alabaster-0.7.12.tar.gz", hash = "sha256:a661d72d58e6ea8a57f7a86e37d86716863ee5e92788398526d58b26a4e4dc02"},
 ]
 babel = [
-    {file = "Babel-2.9.0-py2.py3-none-any.whl", hash = "sha256:9d35c22fcc79893c3ecc85ac4a56cde1ecf3f19c540bba0922308a6c06ca6fa5"},
-    {file = "Babel-2.9.0.tar.gz", hash = "sha256:da031ab54472314f210b0adcff1588ee5d1d1d0ba4dbd07b94dba82bde791e05"},
+    {file = "Babel-2.9.1-py2.py3-none-any.whl", hash = "sha256:ab49e12b91d937cd11f0b67cb259a57ab4ad2b59ac7a3b41d6c06c0ac5b0def9"},
+    {file = "Babel-2.9.1.tar.gz", hash = "sha256:bc0c176f9f6a994582230df350aa6e05ba2ebe4b3ac317eab29d9be5d2768da0"},
 ]
 certifi = [
-    {file = "certifi-2020.12.5-py2.py3-none-any.whl", hash = "sha256:719a74fb9e33b9bd44cc7f3a8d94bc35e4049deebe19ba7d8e108280cfd59830"},
-    {file = "certifi-2020.12.5.tar.gz", hash = "sha256:1a4995114262bffbc2413b159f2a1a480c969de6e6eb13ee966d470af86af59c"},
+    {file = "certifi-2021.5.30-py2.py3-none-any.whl", hash = "sha256:50b1e4f8446b06f41be7dd6338db18e0990601dce795c2b1686458aa7e8fa7d8"},
+    {file = "certifi-2021.5.30.tar.gz", hash = "sha256:2bbf76fd432960138b3ef6dda3dde0544f27cbf8546c458e60baf371917ba9ee"},
 ]
 chardet = [
     {file = "chardet-4.0.0-py2.py3-none-any.whl", hash = "sha256:f864054d66fd9118f2e67044ac8981a54775ec5b67aed0441892edb553d21da5"},
@@ -516,12 +517,12 @@ crayons = [
     {file = "crayons-0.4.0.tar.gz", hash = "sha256:bd33b7547800f2cfbd26b38431f9e64b487a7de74a947b0fafc89b45a601813f"},
 ]
 docutils = [
-    {file = "docutils-0.17-py2.py3-none-any.whl", hash = "sha256:a71042bb7207c03d5647f280427f14bfbd1a65c9eb84f4b341d85fafb6bb4bdf"},
-    {file = "docutils-0.17.tar.gz", hash = "sha256:e2ffeea817964356ba4470efba7c2f42b6b0de0b04e66378507e3e2504bbff4c"},
+    {file = "docutils-0.16-py2.py3-none-any.whl", hash = "sha256:0c5b78adfbf7762415433f5515cd5c9e762339e23369dbe8000d84a4bf4ab3af"},
+    {file = "docutils-0.16.tar.gz", hash = "sha256:c2de3a60e9e7d07be26b7f2b00ca0309c207e06c100f9cc2a94931fc75a478fc"},
 ]
 flake8 = [
-    {file = "flake8-3.9.0-py2.py3-none-any.whl", hash = "sha256:12d05ab02614b6aee8df7c36b97d1a3b2372761222b19b58621355e82acddcff"},
-    {file = "flake8-3.9.0.tar.gz", hash = "sha256:78873e372b12b093da7b5e5ed302e8ad9e988b38b063b61ad937f26ca58fc5f0"},
+    {file = "flake8-3.9.2-py2.py3-none-any.whl", hash = "sha256:bf8fd333346d844f616e8d47905ef3a3384edae6b4e9beb0c5101e25e3110907"},
+    {file = "flake8-3.9.2.tar.gz", hash = "sha256:07528381786f2a6237b061f6e96610a4167b226cb926e2aa2b6b1d78057c576b"},
 ]
 idna = [
     {file = "idna-2.10-py2.py3-none-any.whl", hash = "sha256:b97d804b1e9b523befed77c48dacec60e6dcb0b5391d57af6a65a312a90648c0"},
@@ -532,66 +533,48 @@ imagesize = [
     {file = "imagesize-1.2.0.tar.gz", hash = "sha256:b1f6b5a4eab1f73479a50fb79fcf729514a900c341d8503d62a62dbc4127a2b1"},
 ]
 importlib-metadata = [
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-    {file = "importlib_metadata-3.10.0.tar.gz", hash = "sha256:c9db46394197244adf2f0b08ec5bc3cf16757e9590b02af1fca085c16c0d600a"},
+    {file = "importlib_metadata-4.6.0-py3-none-any.whl", hash = "sha256:c6513572926a96458f8c8f725bf0e00108fba0c9583ade9bd15b869c9d726e33"},
+    {file = "importlib_metadata-4.6.0.tar.gz", hash = "sha256:4a5611fea3768d3d967c447ab4e93f567d95db92225b43b7b238dbfb855d70bb"},
 ]
 jinja2 = [
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-    {file = "Jinja2-2.11.3.tar.gz", hash = "sha256:a6d58433de0ae800347cab1fa3043cebbabe8baa9d29e668f1c768cb87a333c6"},
+    {file = "Jinja2-3.0.1-py3-none-any.whl", hash = "sha256:1f06f2da51e7b56b8f238affdd6b4e2c61e39598a378cc49345bc1bd42a978a4"},
+    {file = "Jinja2-3.0.1.tar.gz", hash = "sha256:703f484b47a6af502e743c9122595cc812b0271f661722403114f71a79d0f5a4"},
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 markupsafe = [
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diff --git a/pyproject.toml b/pyproject.toml
index 6f7e1f2..fcedf52 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "stegano"
-version = "0.9.8"
+version = "0.9.9"
 description = "A pure Python Steganography module."
 authors = [
     "Cédric Bonhomme <cedric@cedricbonhomme.org>"