diff --git a/requirements-dev.txt b/requirements-dev.txt
index 7f386ad..274ba2d 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -6,7 +6,7 @@ autopep8==1.4.4
 awscli==1.16.196
 babel==2.7.0
 bandit==1.6.2
-bleach==3.1.0
+bleach==3.1.1
 botocore==1.12.186
 certifi==2019.6.16
 chardet==3.0.4
diff --git a/verifytweet/config/settings.py b/verifytweet/config/settings.py
index 3b6552c..242d921 100644
--- a/verifytweet/config/settings.py
+++ b/verifytweet/config/settings.py
@@ -30,6 +30,9 @@ def no_of_workers():
     twice the cpu count.
 
     """
+    if os.getenv('NUM_WORKERS').isdigit():
+        return int(os.getenv('NUM_WORKERS'))
+    
     return multiprocessing.cpu_count() * 2 + 1