diff --git a/requirements.txt b/requirements.txt
index 0eb9df3bc6..5dcc0b3e7f 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -3,7 +3,7 @@ Lektor==3.3.12
 # These are pinned because they're versions that are known to work
 Babel==2.17.0
 EXIFRead==3.0.0
-Flask==3.1.3
+Flask==2.3.3
 Jinja2==3.1.6
 Lektor==3.3.12
 Werkzeug==2.3.8