diff --git a/header_version_updater.py b/header_version_updater.py
index 1c558bd..177e81e 100644
--- a/header_version_updater.py
+++ b/header_version_updater.py
@@ -1,44 +1,43 @@
 import re
 from pathlib import Path
 
-version = input("New version = ").strip()
+version_input = input("New version = ").strip()
 
 js_file = Path("melpomene.js")
 css_file = Path("melpomene.css")
-js_css_match = r"(?<=/\* Version ).*(?= \*/)"
-
-js_variable_match = r"(?<=const MELPOMENE_VERSION = \").*(?=\";)"
+JS_CSS_MATCH = r"(?<=/\* Version ).*(?= \*/)"
+JS_VARIABLE_MATCH = r"(?<=const MELPOMENE_VERSION = \").*(?=\";)"
 
 html_file = Path("melpomene.html")
 demo_high_res_file = Path("demos/pepper_and_carrot_e35_highres.html")
 demo_low_res_file = Path("demos/pepper_and_carrot_e35_lowres.html")
-html_match = r"(?<=<!-- Version ).*(?= -->)"
+HTML_MATCH = r"(?<=<!-- Version ).*(?= -->)"
 
 zoom_generator_file = Path("zooms_generator.py")
-zoom_generator_match = r"(?<=# Version ).*(?=$)"
+ZOOM_GENERATOR_MATCH = r"(?<=# Version ).*(?=$)"
 
 
 def replace_version(version, file_path, matcher):
     with open(file=file_path, mode="r", encoding="UTF8") as file:
         file_data = file.read()
 
-    file_data = re.sub(matcher, version, file_data)
+    file_data = re.sub(matcher, version, file_data, flags=re.MULTILINE)
 
     with open(file=file_path, mode="w", encoding="UTF8") as file:
         file.write(file_data)
 
 
-if re.match(r"[.a-zA-Z\ \-0-9]{1,30}", version):
-    replace_version(version, js_file, js_css_match)
-    replace_version(version, js_file, js_variable_match)
+if re.match(r"[.a-zA-Z\ \-0-9]{1,30}", version_input):
+    replace_version(version_input, js_file, JS_CSS_MATCH)
+    replace_version(version_input, js_file, JS_VARIABLE_MATCH)
 
-    replace_version(version, css_file, js_css_match)
+    replace_version(version_input, css_file, JS_CSS_MATCH)
 
-    replace_version(version, html_file, html_match)
-    replace_version(version, demo_high_res_file, html_match)
-    replace_version(version, demo_low_res_file, html_match)
+    replace_version(version_input, html_file, HTML_MATCH)
+    replace_version(version_input, demo_high_res_file, HTML_MATCH)
+    replace_version(version_input, demo_low_res_file, HTML_MATCH)
 
-    replace_version(version, zoom_generator_file, zoom_generator_match)
+    replace_version(version_input, zoom_generator_file, ZOOM_GENERATOR_MATCH)
 
     print("Done")
 else: