diff --git a/requirements/edx/base.txt b/requirements/edx/base.txt
index e3c92cb599..7f5b4d5a22 100644
--- a/requirements/edx/base.txt
+++ b/requirements/edx/base.txt
@@ -20,7 +20,7 @@
 -e common/lib/xmodule  # via -r requirements/edx/local.in
 amqp==2.6.1               # via kombu
 analytics-python==1.2.9   # via -r requirements/edx/base.in
-aniso8601==9.0.0          # via edx-tincan-py35, tincan
+aniso8601==9.0.1          # via edx-tincan-py35, tincan
 appdirs==1.4.4            # via fs
 attrs==20.3.0             # via -r requirements/edx/base.in, edx-ace
 babel==2.9.0              # via -r requirements/edx/base.in, enmerkar, enmerkar-underscore
diff --git a/requirements/edx/development.txt b/requirements/edx/development.txt
index 1e30f01679..4cc8c62361 100644
--- a/requirements/edx/development.txt
+++ b/requirements/edx/development.txt
@@ -21,7 +21,7 @@
 alabaster==0.7.12         # via sphinx
 amqp==2.6.1               # via -r requirements/edx/testing.txt, kombu
 analytics-python==1.2.9   # via -r requirements/edx/testing.txt
-aniso8601==9.0.0          # via -r requirements/edx/testing.txt, edx-tincan-py35, tincan
+aniso8601==9.0.1          # via -r requirements/edx/testing.txt, edx-tincan-py35, tincan
 apipkg==1.5               # via -r requirements/edx/testing.txt, execnet
 appdirs==1.4.4            # via -r requirements/edx/testing.txt, fs, virtualenv
 astroid==2.5.1            # via -r requirements/edx/testing.txt, pylint, pylint-celery
diff --git a/requirements/edx/testing.txt b/requirements/edx/testing.txt
index 4243cbef6f..aed61f2261 100644
--- a/requirements/edx/testing.txt
+++ b/requirements/edx/testing.txt
@@ -20,7 +20,7 @@
 -e common/lib/xmodule  # via -r requirements/edx/base.txt
 amqp==2.6.1               # via -r requirements/edx/base.txt, kombu
 analytics-python==1.2.9   # via -r requirements/edx/base.txt
-aniso8601==9.0.0          # via -r requirements/edx/base.txt, edx-tincan-py35, tincan
+aniso8601==9.0.1          # via -r requirements/edx/base.txt, edx-tincan-py35, tincan
 apipkg==1.5               # via execnet
 appdirs==1.4.4            # via -r requirements/edx/base.txt, fs, virtualenv
 astroid==2.5.1            # via pylint, pylint-celery