diff --git a/textimager-uima-cltk/requirements.txt b/textimager-uima-cltk/requirements.txt
index eea066de..ee04d9b8 100644
--- a/textimager-uima-cltk/requirements.txt
+++ b/textimager-uima-cltk/requirements.txt
@@ -1,3 +1,3 @@
-flask==1.0
+flask==3.1.3
 cltk==0.1.99
 flask-cors==3.0.6