diff --git a/pkgs/applications/misc/octoprint/default.nix b/pkgs/applications/misc/octoprint/default.nix
index 71705b005453..aecea732a23e 100644
--- a/pkgs/applications/misc/octoprint/default.nix
+++ b/pkgs/applications/misc/octoprint/default.nix
@@ -70,6 +70,7 @@ in pythonPackages.buildPythonApplication rec {
       -e 's,Flask-Login>=[^"]*,Flask-Login,g' \
       -e 's,rsa>=[^"]*,rsa,g' \
       -e 's,PyYAML>=[^"]*,PyYAML,g' \
+      -e 's,flask>=[^"]*,flask,g' \
       setup.py
   '';
 
diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index 578251af1f4b..be63f65e6a6f 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -11124,11 +11124,11 @@ in {
   };
 
   flask = buildPythonPackage {
-    name = "flask-0.10.1";
+    name = "flask-0.11.1";
 
     src = pkgs.fetchurl {
-      url = "mirror://pypi/F/Flask/Flask-0.10.1.tar.gz";
-      sha256 = "4c83829ff83d408b5e1d4995472265411d2c414112298f2eb4b359d9e4563373";
+      url = "mirror://pypi/F/Flask/Flask-0.11.1.tar.gz";
+      sha256 = "03kbfll4sj3v5z7r31c7bhfpi11r1np076d4p1k2kg4yzcmkywdl";
     };
 
     propagatedBuildInputs = with self; [ itsdangerous click werkzeug jinja2 ];