diff --git a/CHANGELOG.md b/CHANGELOG.md
index 18899887..b5138acf 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,8 @@
 # Changelog
 
+## v1.6.4
+* (#240) fix Pint Quantity import error by using more recent version.
+
 ## v1.6.3
 * (#237) Add tests for MongoDB emitter and fix related bugs
 * (#238) apply `global_time_precision` to the `emit_time`
diff --git a/setup.py b/setup.py
index 0d2dd4f6..2ece395e 100644
--- a/setup.py
+++ b/setup.py
@@ -2,7 +2,7 @@
 from setuptools import setup
 
 
-VERSION = '1.6.3'
+VERSION = '1.6.4'
 
 
 if __name__ == '__main__':
@@ -54,7 +54,7 @@
             'matplotlib>=3.5.1',
             'networkx>=2.6.3',
             'numpy>=1.22.1',
-            'Pint>=0.18',
+            'Pint>=0.23',
             'pymongo>=4.0.1',
             'scipy>=1.7.3',
             'pytest>=6.2.5',