diff --git a/requirements.txt b/requirements.txt
index 5326c1a..f85ca67 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,7 +2,7 @@
 
 Flask==1.1.2
 alembic==1.4.3
-aniso8601==7.0.0
+aniso8601==8.1.1
 apache-airflow==1.10.12
 apispec==1.3.3
 appdirs==1.4.4
diff --git a/requirements_all.txt b/requirements_all.txt
index 84729cd..7a01ec4 100644
--- a/requirements_all.txt
+++ b/requirements_all.txt
@@ -1,5 +1,5 @@
 alembic==1.4.3
-aniso8601==7.0.0
+aniso8601==8.1.1
 apache-airflow==1.10.12
 apispec==1.3.3
 appdirs==1.4.4