diff --git a/extraction/techniques.py b/extraction/techniques.py
index f1dc18d..df51dc9 100644
--- a/extraction/techniques.py
+++ b/extraction/techniques.py
@@ -44,7 +44,7 @@ class HeadTags(Technique):
     def extract(self, html):
         "Extract data from meta, link and title tags within the head tag."
         extracted = {}
-        soup = BeautifulSoup(html)
+        soup = BeautifulSoup(html, "lxml")
         # extract data from title tag
         title_tag = soup.find('title')
         if title_tag:
@@ -168,7 +168,7 @@ def extract(self, html):
         titles = []
         descriptions = []
         videos = []
-        soup = BeautifulSoup(html)
+        soup = BeautifulSoup(html, "lxml")
         for article in soup.find_all('article') or []:
             title = article.find('h1')
             if title:
@@ -207,7 +207,7 @@ class SemanticTags(Technique):
     def extract(self, html):
         "Extract data from usual semantic tags."
         extracted = {}
-        soup = BeautifulSoup(html)
+        soup = BeautifulSoup(html, "lxml")
         
         for tag, dest, max_to_store in self.extract_string:
             for found in soup.find_all(tag)[:max_to_store] or []: