diff --git a/poetry.lock b/poetry.lock
index c83d018..d07ba83 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -38,14 +38,6 @@ dev = ["coverage", "hypothesis", "pympler", "pytest (>=4.3.0)", "six", "zope.int
 docs = ["sphinx", "zope.interface"]
 tests = ["coverage", "hypothesis", "pympler", "pytest (>=4.3.0)", "six", "zope.interface"]
 
-[[package]]
-category = "main"
-description = "The ssl.match_hostname() function from Python 3.5"
-name = "backports.ssl-match-hostname"
-optional = false
-python-versions = "*"
-version = "3.7.0.1"
-
 [[package]]
 category = "dev"
 description = "The uncompromising code formatter."
@@ -412,11 +404,8 @@ category = "main"
 description = "Tornado is a Python web framework and asynchronous networking library, originally developed at FriendFeed."
 name = "tornado"
 optional = false
-python-versions = "*"
-version = "3.2"
-
-[package.dependencies]
-"backports.ssl_match_hostname" = "*"
+python-versions = ">= 2.7, !=3.0.*, !=3.1.*, !=3.2.*, != 3.3.*"
+version = "5.1.1"
 
 [[package]]
 category = "dev"
@@ -483,7 +472,7 @@ docs = ["sphinx", "jaraco.packaging (>=3.2)", "rst.linker (>=1.9)"]
 testing = ["pathlib2", "unittest2", "jaraco.itertools", "func-timeout"]
 
 [metadata]
-content-hash = "70cf274c1fa61f39efdf03028068ec44f48f92eaa24c24bfebf145809c863a91"
+content-hash = "d522ba07e4a1877d27d25541de34eda133d353f99e81815b225d840c5d9d4b79"
 python-versions = "^3.5"
 
 [metadata.files]
@@ -503,9 +492,6 @@ attrs = [
     {file = "attrs-19.3.0-py2.py3-none-any.whl", hash = "sha256:08a96c641c3a74e44eb59afb61a24f2cb9f4d7188748e76ba4bb5edfa3cb7d1c"},
     {file = "attrs-19.3.0.tar.gz", hash = "sha256:f7b7ce16570fe9965acd6d30101a28f62fb4a7f9e926b3bbc9b61f8b04247e72"},
 ]
-"backports.ssl-match-hostname" = [
-    {file = "backports.ssl_match_hostname-3.7.0.1.tar.gz", hash = "sha256:bb82e60f9fbf4c080eabd957c39f0641f0fc247d9a16e31e26d594d8f42b9fd2"},
-]
 black = [
     {file = "black-19.10b0-py36-none-any.whl", hash = "sha256:1b30e59be925fafc1ee4565e5e08abef6b03fe455102883820fe5ee2e4734e0b"},
     {file = "black-19.10b0.tar.gz", hash = "sha256:c2edb73a08e9e0e6f65a0e6af18b059b8b1cdd5bef997d7a0b181df93dc81539"},
@@ -718,7 +704,13 @@ toml = [
     {file = "toml-0.10.1.tar.gz", hash = "sha256:926b612be1e5ce0634a2ca03470f95169cf16f939018233a670519cb4ac58b0f"},
 ]
 tornado = [
-    {file = "tornado-3.2.tar.gz", hash = "sha256:c8c2949c8d42af781437e356978f00a42b16a090612573cd7385c62451a00c2b"},
+    {file = "tornado-5.1.1-cp35-cp35m-win32.whl", hash = "sha256:732e836008c708de2e89a31cb2fa6c0e5a70cb60492bee6f1ea1047500feaf7f"},
+    {file = "tornado-5.1.1-cp35-cp35m-win_amd64.whl", hash = "sha256:0662d28b1ca9f67108c7e3b77afabfb9c7e87bde174fbda78186ecedc2499a9d"},
+    {file = "tornado-5.1.1-cp36-cp36m-win32.whl", hash = "sha256:8154ec22c450df4e06b35f131adc4f2f3a12ec85981a203301d310abf580500f"},
+    {file = "tornado-5.1.1-cp36-cp36m-win_amd64.whl", hash = "sha256:d4b3e5329f572f055b587efc57d29bd051589fb5a43ec8898c77a47ec2fa2bbb"},
+    {file = "tornado-5.1.1-cp37-cp37m-win32.whl", hash = "sha256:e5f2585afccbff22390cddac29849df463b252b711aa2ce7c5f3f342a5b3b444"},
+    {file = "tornado-5.1.1-cp37-cp37m-win_amd64.whl", hash = "sha256:8e9d728c4579682e837c92fdd98036bd5cdefa1da2aaf6acf26947e6dd0c01c5"},
+    {file = "tornado-5.1.1.tar.gz", hash = "sha256:4e5158d97583502a7e2739951553cbd88a72076f152b4b11b64b9a10c4c49409"},
 ]
 typed-ast = [
     {file = "typed_ast-1.4.1-cp35-cp35m-manylinux1_i686.whl", hash = "sha256:73d785a950fc82dd2a25897d525d003f6378d1cb23ab305578394694202a58c3"},
diff --git a/pyproject.toml b/pyproject.toml
index a152059..a58a4fb 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -20,7 +20,7 @@ jinja2 = "==2.7.2"
 misaka = "==1.0.2"
 parguments = "==0.3.2"
 pygments = "==1.6"
-tornado = "==3.2"
+tornado = "==5.1.1"
 ujson = "==2.0.3"
 watchdog = "==0.7.0"
 pyyaml = "^5.3"