diff --git a/deploy.py b/deploy.py
index 9fcefbb..d3dd4dc 100644
--- a/deploy.py
+++ b/deploy.py
@@ -15,7 +15,7 @@ chdir('html')
 for f in [i for i in listdir() if i.endswith('.html')]:
 
     # 1. Minify the index.html file using minify-html
-    minified_content = minify_html.minify(open(f, 'r').read(), minify_css=True, minify_doctype=False)
+    minified_content = minify_html.minify(open(f, 'r').read(), minify_css=True, do_not_minify_doctype=True)
 
     # 2. Upload the file to an FTP server
 
diff --git a/requirements.txt b/requirements.txt
index 6bd459d..de724f3 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,2 +1,2 @@
 requests
-minify-html
\ No newline at end of file
+minify-html==0.15.0
\ No newline at end of file