diff --git a/requirements/requirements-testing.txt b/requirements/requirements-testing.txt
index d909cd7a..e7181641 100644
--- a/requirements/requirements-testing.txt
+++ b/requirements/requirements-testing.txt
@@ -100,7 +100,7 @@ dataclasses; python_version<"3.7
 Flask==0.12.5
  cloudant==2.15.0
  pymongo[tls]==3.13.0
- winkerberos==0.7.0
+ winkerberos==0.9.1
  pykerberos==1.2.4
  ibm_db
  
@@ -110,7 +110,7 @@ cloudant==2.15.0
 
 pymongo[tls]==3.13.0
 
-winkerberos==0.8.0
+winkerberos==0.9.1
 
 pykerberos==1.2.4
 
diff --git a/requirements/requirements/requirements-optionals.txt b/requirements/requirements/requirements-optionals.txt
index a251cf9e..2069f535 100644
--- a/requirements/requirements/requirements-optionals.txt
+++ b/requirements/requirements/requirements-optionals.txt
@@ -100,6 +100,6 @@ dataclasses; python_version<"3.7
 Flask==0.12.5
  cloudant==2.15.0
  pymongo[tls]==3.13.0
- winkerberos==0.7.0
+ winkerberos==0.9.1
  pykerberos==1.2.4
  ibm_db