diff --git a/requirements.txt b/requirements.txt
index c1b286d..369f585 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -12,7 +12,7 @@ Flask-Session==0.3.1
 
 
 # External libraries
-SQLAlchemy==1.0.11
+SQLAlchemy==1.2.18
 twilio==6.9.0
 passlib==1.6.5
 bcrypt==2.0.0
@@ -24,5 +24,7 @@ pysocks==1.6.6
 unittest2==1.1.0
 coverage==4.0.3
 xmlunittest==0.3.2
-lxml==3.4
+lxml==4.9.1
 mock==2.0.0
+mako>=1.2.2 # not directly required, pinned by Snyk to avoid a vulnerability
+pyjwt>=2.4.0 # not directly required, pinned by Snyk to avoid a vulnerability