diff --git a/pkgs/development/python-modules/debugpy/default.nix b/pkgs/development/python-modules/debugpy/default.nix
index 059f2110fd53..da1f25ad2c3e 100644
--- a/pkgs/development/python-modules/debugpy/default.nix
+++ b/pkgs/development/python-modules/debugpy/default.nix
@@ -2,6 +2,7 @@
 , stdenv
 , buildPythonPackage
 , fetchFromGitHub
+, fetchpatch
 , substituteAll
 , gdb
 , flask
@@ -48,6 +49,12 @@ buildPythonPackage rec {
     # To avoid this issue, debugpy should be installed using python.withPackages:
     # python.withPackages (ps: with ps; [ debugpy ])
     ./fix-test-pythonpath.patch
+
+    # Fix tests with flask>=2.0
+    (fetchpatch {
+      url = "https://github.com/microsoft/debugpy/commit/0a7f2cd67dda27ea4d38389b49a4e2a1899b834e.patch";
+      sha256 = "1g070fn07n7jj01jaf5s570zn70akf6klkamigs3ix11gh736rpn";
+    })
   ];
 
   # Remove pre-compiled "attach" libraries and recompile for host platform