diff --git a/docs/changelog.md b/docs/changelog.md
index aa6c75a4..0002f664 100644
--- a/docs/changelog.md
+++ b/docs/changelog.md
@@ -1,5 +1,8 @@
 # Change log
 
+## 2024.1.23
+- Lazy import of optional libraries to speed up startup.
+
 ## 2023.9.25
 
 - Improved pydantic2 support (@munrojm).
diff --git a/docs/monty.functools.md b/docs/monty.functools.md
index 93fd41b6..15bc0fca 100644
--- a/docs/monty.functools.md
+++ b/docs/monty.functools.md
@@ -73,10 +73,13 @@ becomes
 The decorated main accepts two new arguments:
 
 > prof_file: Name of the output file with profiling data
+
 > ```none
 > If not given, a temporary file is created.
 > ```
+
 > sortby: Profiling data are sorted according to this value.
+
 > ```none
 > default is “time”. See sort_stats.
 > ```
diff --git a/docs/monty.os.md b/docs/monty.os.md
index 96184b2e..8d85d1dc 100644
--- a/docs/monty.os.md
+++ b/docs/monty.os.md
@@ -15,6 +15,7 @@ performing some tasks, and returns to the original working directory
 afterwards. E.g.,
 
 > with cd(“/my/path/”):
+
 > ```none
 > do_something()
 > ```
diff --git a/docs/monty.re.md b/docs/monty.re.md
index b7e419ef..7082093f 100644
--- a/docs/monty.re.md
+++ b/docs/monty.re.md
@@ -25,9 +25,11 @@ A powerful regular expression version of grep.
 * **Returns**
 
 > {key1: [[[matches…], lineno], [[matches…], lineno],
+
 > ```none
 > [[matches…], lineno], …],
 > ```
+
 > key2: …}
 
 For reverse reads, the lineno is given as a -ve number. Please note
diff --git a/monty/__init__.py b/monty/__init__.py
index cfea3afd..6483e6b9 100644
--- a/monty/__init__.py
+++ b/monty/__init__.py
@@ -7,7 +7,7 @@
 
 __author__ = "Shyue Ping Ong"
 __copyright__ = "Copyright 2014, The Materials Virtual Lab"
-__version__ = "2023.11.3"
+__version__ = "2024.1.23"
 __maintainer__ = "Shyue Ping Ong"
 __email__ = "ongsp@ucsd.edu"
 __date__ = "Oct 12 2020"
diff --git a/pyproject.toml b/pyproject.toml
index ebd89a3e..df30d109 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -22,7 +22,7 @@ classifiers = [
 dependencies = [
 
 ]
-version = "2023.11.3"
+version = "2024.1.23"
 
 [tool.setuptools]
 packages = ["monty"]
diff --git a/tests/test_files/3000_lines.txt.gz b/tests/test_files/3000_lines.txt.gz
index 844db6dd..71df51eb 100644
Binary files a/tests/test_files/3000_lines.txt.gz and b/tests/test_files/3000_lines.txt.gz differ