diff --git a/CHANGELOG.md b/CHANGELOG.md
index 476752d68f..e7d0c1e7c7 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -14,6 +14,35 @@ Use `pip install pip --upgrade` to upgrade pip. Check pip version with
 
 <!-- <START NEW CHANGELOG ENTRY> -->
 
+## 6.4.5
+
+([Full Changelog](https://github.com/jupyter/notebook/compare/v6.4.4...ccd9665571107e02a325a738b8baebd6532b2d3d))
+
+### Bug fixes
+
+- Recover from failure to render mimetype [#6181](https://github.com/jupyter/notebook/pull/6181) ([@martinRenou](https://github.com/martinRenou))
+
+### Maintenance and upkeep improvements
+
+- Fix crypto handling [#6197](https://github.com/jupyter/notebook/pull/6197) ([@blink1073](https://github.com/blink1073))
+- Fix `jupyter_client` warning [#6178](https://github.com/jupyter/notebook/pull/6178) ([@martinRenou](https://github.com/martinRenou))
+
+### Documentation improvements
+
+- Fix nbsphinx settings [#6200](https://github.com/jupyter/notebook/pull/6200) ([@mgeier](https://github.com/mgeier))
+- Fully revert the pinning of `nbsphinx` to 0.8.6 [#6201](https://github.com/jupyter/notebook/pull/6201) ([@kevin-bates](https://github.com/kevin-bates))
+- Pin `nbsphinx` to 0.8.6, clean up orphaned resources [#6194](https://github.com/jupyter/notebook/pull/6194) ([@kevin-bates](https://github.com/kevin-bates))
+- Fix typo in docstring [#6188](https://github.com/jupyter/notebook/pull/6188) ([@jgarte](https://github.com/jgarte))
+
+
+### Contributors to this release
+
+([GitHub contributors page for this release](https://github.com/jupyter/notebook/graphs/contributors?from=2021-09-03&to=2021-10-19&type=c))
+
+[@blink1073](https://github.com/search?q=repo%3Ajupyter%2Fnotebook+involves%3Ablink1073+updated%3A2021-09-03..2021-10-19&type=Issues) | [@jgarte](https://github.com/search?q=repo%3Ajupyter%2Fnotebook+involves%3Ajgarte+updated%3A2021-09-03..2021-10-19&type=Issues) | [@kevin-bates](https://github.com/search?q=repo%3Ajupyter%2Fnotebook+involves%3Akevin-bates+updated%3A2021-09-03..2021-10-19&type=Issues) | [@martinRenou](https://github.com/search?q=repo%3Ajupyter%2Fnotebook+involves%3AmartinRenou+updated%3A2021-09-03..2021-10-19&type=Issues) | [@mgeier](https://github.com/search?q=repo%3Ajupyter%2Fnotebook+involves%3Amgeier+updated%3A2021-09-03..2021-10-19&type=Issues)
+
+<!-- <END NEW CHANGELOG ENTRY> -->
+
 ## 6.4.4
 
 ([Full Changelog](https://github.com/jupyter/notebook/compare/v6.4.3...c06c340574e1d2207940c5bd1190eb73d82ab945))
@@ -33,8 +62,6 @@ Use `pip install pip --upgrade` to upgrade pip. Check pip version with
 
 [@blink1073](https://github.com/search?q=repo%3Ajupyter%2Fnotebook+involves%3Ablink1073+updated%3A2021-08-11..2021-09-03&type=Issues) | [@kevin-bates](https://github.com/search?q=repo%3Ajupyter%2Fnotebook+involves%3Akevin-bates+updated%3A2021-08-11..2021-09-03&type=Issues) | [@krassowski](https://github.com/search?q=repo%3Ajupyter%2Fnotebook+involves%3Akrassowski+updated%3A2021-08-11..2021-09-03&type=Issues) | [@massongit](https://github.com/search?q=repo%3Ajupyter%2Fnotebook+involves%3Amassongit+updated%3A2021-08-11..2021-09-03&type=Issues) | [@minrk](https://github.com/search?q=repo%3Ajupyter%2Fnotebook+involves%3Aminrk+updated%3A2021-08-11..2021-09-03&type=Issues) | [@Zsailer](https://github.com/search?q=repo%3Ajupyter%2Fnotebook+involves%3AZsailer+updated%3A2021-08-11..2021-09-03&type=Issues)
 
-<!-- <END NEW CHANGELOG ENTRY> -->
-
 ## 6.4.3
 
 ([Full Changelog](https://github.com/jupyter/notebook/compare/v6.4.2...c373bd89adaaddffbb71747ebbcfe8a749cae0a8))
diff --git a/notebook/_version.py b/notebook/_version.py
index 6c5729f54d..29244a3b21 100644
--- a/notebook/_version.py
+++ b/notebook/_version.py
@@ -5,7 +5,7 @@
 import re
 
 # Version string must appear intact for tbump versioning
-__version__ = '6.5.0.dev0'
+__version__ = '6.4.5'
 
 # Build up version_info tuple for backwards compatibility
 pattern = r'(?P<major>\d+).(?P<minor>\d+).(?P<patch>\d+)(?P<rest>.*)'
diff --git a/notebook/i18n/zh_CN/LC_MESSAGES/notebook.po b/notebook/i18n/zh_CN/LC_MESSAGES/notebook.po
index 9009f957cb..6b641c0fd2 100644
--- a/notebook/i18n/zh_CN/LC_MESSAGES/notebook.po
+++ b/notebook/i18n/zh_CN/LC_MESSAGES/notebook.po
@@ -368,7 +368,7 @@ msgstr ""
 #: notebook/notebookapp.py:1187
 #, python-format
 msgid "The port %i is already in use, trying another port."
-msgstr "端口 %i 已经被站用, 请尝试其他端口."
+msgstr "端口 %i 已经被占用, 请尝试其他端口."
 
 #: notebook/notebookapp.py:1190
 #, python-format
diff --git a/notebook/static/base/js/namespace.js b/notebook/static/base/js/namespace.js
index f9b9db92ee..eeab968d7c 100644
--- a/notebook/static/base/js/namespace.js
+++ b/notebook/static/base/js/namespace.js
@@ -73,7 +73,7 @@ define(function(){
     // tree
     jglobal('SessionList','tree/js/sessionlist');
 
-    Jupyter.version = "6.4.4";
+    Jupyter.version = "6.4.5";
     Jupyter._target = '_blank';
 
     return Jupyter;
diff --git a/pyproject.toml b/pyproject.toml
index 9553029ced..57c348462a 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -17,7 +17,7 @@ before-build-python = ["pip install babel", "npm install -g po2json"]
 ignore-glob = ["docs/source/examples/Notebook/Working With Markdown Cells.ipynb", "docs-translations/**/README.md", "docs/source/contributing.rst", "docs/source/examples/Notebook/JavaScript Notebook Extensions.ipynb", "CHANGELOG.md", "notebook/static/components/**/*.*"]
 
 [tool.tbump.version]
-current = "6.5.0.dev0"
+current = "6.4.5"
 regex = '''
   (?P<major>\d+)\.(?P<minor>\d+)\.(?P<patch>\d+)
   ((?P<channel>a|b|rc|.dev)(?P<release>\d+))?
diff --git a/setup.py b/setup.py
index 2a75fd08ba..4ae0febdc6 100755
--- a/setup.py
+++ b/setup.py
@@ -122,7 +122,7 @@
         'nbformat',
         'nbconvert',
         'ipykernel', # bless IPython kernel for now
-        'Send2Trash>=1.5.0',
+        'Send2Trash>=1.8.0',
         'terminado>=0.8.3',
         'prometheus_client'
     ],