diff --git a/poetry.lock b/poetry.lock
index c57a1df0..edc7ea9b 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -1,7 +1,7 @@
 [[package]]
 category = "dev"
 description = "Disable App Nap on OS X 10.9"
-marker = "python_version >= \"3.3\" and sys_platform == \"darwin\" or platform_system == \"Darwin\""
+marker = "sys_platform == \"darwin\" or platform_system == \"Darwin\" or python_version >= \"3.3\" and sys_platform == \"darwin\""
 name = "appnope"
 optional = false
 python-versions = "*"
@@ -24,7 +24,6 @@ tests = ["coverage", "hypothesis", "pympler", "pytest (>=4.3.0)", "six", "zope.i
 [[package]]
 category = "dev"
 description = "Specifications for callback functions passed in to an API"
-marker = "python_version >= \"3.3\""
 name = "backcall"
 optional = false
 python-versions = "*"
@@ -45,7 +44,7 @@ webencodings = "*"
 [[package]]
 category = "dev"
 description = "Cross-platform colored terminal text."
-marker = "python_version >= \"3.3\" and sys_platform == \"win32\""
+marker = "python_version >= \"3.3\" and sys_platform == \"win32\" or sys_platform == \"win32\""
 name = "colorama"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
@@ -198,7 +197,6 @@ test = ["pytest (>=3.6.0)", "pytest-cov", "mock"]
 [[package]]
 category = "dev"
 description = "An autocompletion tool for Python that can be used for text editors."
-marker = "python_version >= \"3.3\""
 name = "jedi"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
@@ -344,7 +342,7 @@ description = "Python plotting package"
 name = "matplotlib"
 optional = false
 python-versions = ">=3.6"
-version = "3.1.1"
+version = "3.2.1"
 
 [package.dependencies]
 cycler = ">=0.10"
@@ -487,7 +485,7 @@ testing = ["docopt", "pytest (>=3.0.7)"]
 [[package]]
 category = "dev"
 description = "Pexpect allows easy control of interactive console applications."
-marker = "python_version >= \"3.3\" and sys_platform != \"win32\""
+marker = "python_version >= \"3.3\" and sys_platform != \"win32\" or sys_platform != \"win32\""
 name = "pexpect"
 optional = false
 python-versions = "*"
@@ -499,7 +497,6 @@ ptyprocess = ">=0.5"
 [[package]]
 category = "dev"
 description = "Tiny 'shelve'-like database with concurrency support"
-marker = "python_version >= \"3.3\""
 name = "pickleshare"
 optional = false
 python-versions = "*"
@@ -824,7 +821,7 @@ docs = ["sphinx", "jaraco.packaging (>=3.2)", "rst.linker (>=1.9)"]
 testing = ["jaraco.itertools", "func-timeout"]
 
 [metadata]
-content-hash = "dba754f0b9d194e7966bfcde6c877ecc2c99b2ca342be245206d425795d59175"
+content-hash = "7349e53614a2c0be250cac7fbabac0c33561e5c51965d24b48f5ce1a5fba14f6"
 python-versions = "^3.6"
 
 [metadata.files]
@@ -996,15 +993,20 @@ markupsafe = [
     {file = "MarkupSafe-1.1.1.tar.gz", hash = "sha256:29872e92839765e546828bb7754a68c418d927cd064fd4708fab9fe9c8bb116b"},
 ]
 matplotlib = [
-    {file = "matplotlib-3.1.1-cp36-cp36m-macosx_10_6_intel.macosx_10_9_intel.macosx_10_9_x86_64.macosx_10_10_intel.macosx_10_10_x86_64.whl", hash = "sha256:796edbd1182cbffa7e1e7a97f1e141f875a8501ba8dd834269ae3cd45a8c976f"},
-    {file = "matplotlib-3.1.1-cp36-cp36m-manylinux1_x86_64.whl", hash = "sha256:bab9d848dbf1517bc58d1f486772e99919b19efef5dd8596d4b26f9f5ee08b6b"},
-    {file = "matplotlib-3.1.1-cp36-cp36m-win32.whl", hash = "sha256:934e6243df7165aad097572abf5b6003c77c9b6c480c3c4de6f2ef1b5fdd4ec0"},
-    {file = "matplotlib-3.1.1-cp36-cp36m-win_amd64.whl", hash = "sha256:c1fe1e6cdaa53f11f088b7470c2056c0df7d80ee4858dadf6cbe433fcba4323b"},
-    {file = "matplotlib-3.1.1-cp37-cp37m-macosx_10_6_intel.macosx_10_9_intel.macosx_10_9_x86_64.macosx_10_10_intel.macosx_10_10_x86_64.whl", hash = "sha256:ec6bd0a6a58df3628ff269978f4a4b924a0d371ad8ce1f8e2b635b99e482877a"},
-    {file = "matplotlib-3.1.1-cp37-cp37m-manylinux1_x86_64.whl", hash = "sha256:31a30d03f39528c79f3a592857be62a08595dec4ac034978ecd0f814fa0eec2d"},
-    {file = "matplotlib-3.1.1-cp37-cp37m-win32.whl", hash = "sha256:e5b8aeca9276a3a988caebe9f08366ed519fff98f77c6df5b64d7603d0e42e36"},
-    {file = "matplotlib-3.1.1-cp37-cp37m-win_amd64.whl", hash = "sha256:4442ce720907f67a79d45de9ada47be81ce17e6c2f448b3c64765af93f6829c9"},
-    {file = "matplotlib-3.1.1.tar.gz", hash = "sha256:1febd22afe1489b13c6749ea059d392c03261b2950d1d45c17e3aed812080c93"},
+    {file = "matplotlib-3.2.1-cp36-cp36m-macosx_10_9_x86_64.whl", hash = "sha256:e06304686209331f99640642dee08781a9d55c6e32abb45ed54f021f46ccae47"},
+    {file = "matplotlib-3.2.1-cp36-cp36m-manylinux1_x86_64.whl", hash = "sha256:ce378047902b7a05546b6485b14df77b2ff207a0054e60c10b5680132090c8ee"},
+    {file = "matplotlib-3.2.1-cp36-cp36m-win32.whl", hash = "sha256:2466d4dddeb0f5666fd1e6736cc5287a4f9f7ae6c1a9e0779deff798b28e1d35"},
+    {file = "matplotlib-3.2.1-cp36-cp36m-win_amd64.whl", hash = "sha256:f4412241e32d0f8d3713b68d3ca6430190a5e8a7c070f1c07d7833d8c5264398"},
+    {file = "matplotlib-3.2.1-cp37-cp37m-macosx_10_9_x86_64.whl", hash = "sha256:e20ba7fb37d4647ac38f3c6d8672dd8b62451ee16173a0711b37ba0ce42bf37d"},
+    {file = "matplotlib-3.2.1-cp37-cp37m-manylinux1_x86_64.whl", hash = "sha256:282b3fc8023c4365bad924d1bb442ddc565c2d1635f210b700722776da466ca3"},
+    {file = "matplotlib-3.2.1-cp37-cp37m-win32.whl", hash = "sha256:c1cf735970b7cd424502719b44288b21089863aaaab099f55e0283a721aaf781"},
+    {file = "matplotlib-3.2.1-cp37-cp37m-win_amd64.whl", hash = "sha256:56d3147714da5c7ac4bc452d041e70e0e0b07c763f604110bd4e2527f320b86d"},
+    {file = "matplotlib-3.2.1-cp38-cp38-macosx_10_9_x86_64.whl", hash = "sha256:af14e77829c5b5d5be11858d042d6f2459878f8e296228c7ea13ec1fd308eb68"},
+    {file = "matplotlib-3.2.1-cp38-cp38-manylinux1_x86_64.whl", hash = "sha256:aae7d107dc37b4bb72dcc45f70394e6df2e5e92ac4079761aacd0e2ad1d3b1f7"},
+    {file = "matplotlib-3.2.1-cp38-cp38-win32.whl", hash = "sha256:d35891a86a4388b6965c2d527b9a9f9e657d9e110b0575ca8a24ba0d4e34b8fc"},
+    {file = "matplotlib-3.2.1-cp38-cp38-win_amd64.whl", hash = "sha256:4bb50ee4755271a2017b070984bcb788d483a8ce3132fab68393d1555b62d4ba"},
+    {file = "matplotlib-3.2.1-pp373-pypy36_pp73-win32.whl", hash = "sha256:7a9baefad265907c6f0b037c8c35a10cf437f7708c27415a5513cf09ac6d6ddd"},
+    {file = "matplotlib-3.2.1.tar.gz", hash = "sha256:ffe2f9cdcea1086fc414e82f42271ecf1976700b8edd16ca9d376189c6d93aee"},
 ]
 mccabe = [
     {file = "mccabe-0.6.1-py2.py3-none-any.whl", hash = "sha256:ab8a6258860da4b6677da4bd2fe5dc2c659cff31b3ee4f7f5d64e79735b80d42"},
diff --git a/pyproject.toml b/pyproject.toml
index f8bec108..1a8b30bf 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -22,7 +22,7 @@ scipy=">1.4"
 [tool.poetry.dev-dependencies]
 jupyter="1.0.0"
 xgboost="0.90"
-matplotlib="3.1.1"
+matplotlib="3.2.1"
 wget="3.2"
 pandas="0.25.3"
 flake8="3.7.9"