Update version number
diff --git a/requirements-readthedocs.txt b/requirements-readthedocs.txt
index c1637c1..0296610 100644
--- a/requirements-readthedocs.txt
+++ b/requirements-readthedocs.txt
@@ -1,6 +1,6 @@
 # keep synchronous to setup.cfg
 # keep synchronous to src/VERSION.inc
-pyjson5 == 1.6.3
+pyjson5 == 1.6.4
 
 # keep synchronous to requirements-dev.txt
 docutils == 0.19.*
diff --git a/setup.cfg b/setup.cfg
index eb5a24e..a96e3a5 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -1,7 +1,7 @@
 [metadata]
 # keep synchronous to requirements-readthedocs.txt
 # keep synchronous to src/VERSION.inc
-version = 1.6.3
+version = 1.6.4
 
 name = pyjson5
 description = JSON5 serializer and parser for Python 3 written in Cython.
@@ -41,6 +41,7 @@
     Programming Language :: Python :: 3.9
     Programming Language :: Python :: 3.10
     Programming Language :: Python :: 3.11
+    Programming Language :: Python :: 3.12
     Programming Language :: Python :: 3 :: Only
     Programming Language :: Python :: Implementation :: CPython
     Topic :: Text Processing :: General
diff --git a/src/VERSION.inc b/src/VERSION.inc
index f3cbab0..e373d19 100644
--- a/src/VERSION.inc
+++ b/src/VERSION.inc
@@ -1 +1 @@
-"1.6.3"
+"1.6.4"