diff --git a/cerulean_cloud/cloud_function_ais_analysis/requirements.txt b/cerulean_cloud/cloud_function_ais_analysis/requirements.txt
index bc8b3093..983c5f65 100644
--- a/cerulean_cloud/cloud_function_ais_analysis/requirements.txt
+++ b/cerulean_cloud/cloud_function_ais_analysis/requirements.txt
@@ -7,4 +7,5 @@ geopandas==0.12.2
 movingpandas==0.15rc1
 numpy==1.21.5
 scipy==1.8.0
-shapely==2.0.1
\ No newline at end of file
+shapely==2.0.1
+Flask>=1.0,<3.0
\ No newline at end of file