diff --git a/requirements/adapter_dev.txt b/requirements/adapter_dev.txt
index 00259471c..c179de2f5 100644
--- a/requirements/adapter_dev.txt
+++ b/requirements/adapter_dev.txt
@@ -12,7 +12,8 @@ Django>=4.2.30,<6; python_version>="3.8"
 falcon>=2,<4; python_version<"3.9"
 falcon>=4.2.0,<5; python_version>="3.9"
 fastapi>=0.70.0,<1
-Flask>=1,<4
+Flask>=1,<4; python_version<"3.9"
+Flask>=3.1.3,<4; python_version>="3.9"
 Werkzeug>=2,<3; python_version<"3.9"
 Werkzeug>=3.1.8,<4; python_version>="3.9"
 pyramid>=1,<3