diff --git a/Makefile b/Makefile
index 82257b0..7597187 100644
--- a/Makefile
+++ b/Makefile
@@ -9,7 +9,7 @@ clean:
 	@rm -rf *.setup
 
 version:
-	@./CI/make_version.sh
+	@python ./CI/update_version.py
 
 
 purge: clean
diff --git a/VERSION b/VERSION
index 6e36596..b2e2357 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-MsSpec-1.3post4
+MsSpec-1.4post1
diff --git a/src/msspec/__init__.py b/src/msspec/__init__.py
index 2d4b582..909fe02 100644
--- a/src/msspec/__init__.py
+++ b/src/msspec/__init__.py
@@ -1 +1 @@
-__version__ = '1.3post4'
+__version__ = '1.4post1'
diff --git a/src/msspec/msspecgui/__init__.py b/src/msspec/msspecgui/__init__.py
index 2d4b582..909fe02 100644
--- a/src/msspec/msspecgui/__init__.py
+++ b/src/msspec/msspecgui/__init__.py
@@ -1 +1 @@
-__version__ = '1.3post4'
+__version__ = '1.4post1'