diff --git a/colin-api/requirements.txt b/colin-api/requirements.txt
index ee2d1ef93f..f368b51c79 100644
--- a/colin-api/requirements.txt
+++ b/colin-api/requirements.txt
@@ -10,6 +10,7 @@ blinker==1.4
 certifi==2020.12.5
 click==8.1.3
 cx-Oracle==8.1.0
+datedelta==1.3
 debugpy
 ecdsa==0.14.1
 flask-jwt-oidc==0.3.0