diff --git a/pkgs/development/python-modules/perfplot/default.nix b/pkgs/development/python-modules/perfplot/default.nix
index 69fa1c8c0a16..ca8f867e6e30 100644
--- a/pkgs/development/python-modules/perfplot/default.nix
+++ b/pkgs/development/python-modules/perfplot/default.nix
@@ -1,6 +1,7 @@
 { lib
 , buildPythonPackage
 , fetchFromGitHub
+, flit-core
 , dufte
 , matplotlib
 , numpy
@@ -14,15 +15,19 @@
 buildPythonPackage rec {
   pname = "perfplot";
   version = "0.9.13";
+  format = "pyproject";
   disabled = pythonOlder "3.7";
 
   src = fetchFromGitHub {
     owner = "nschloe";
     repo = pname;
-    rev = version;
+    rev = "v${version}";
     sha256 = "0ry5x38sv8gh505z6ip90jymm7kfgyf80y3vjb2i6z567bnblam6";
   };
-  format = "pyproject";
+
+  nativeBuildInputs = [
+    flit-core
+  ];
 
   propagatedBuildInputs = [
     dufte
@@ -44,5 +49,6 @@ buildPythonPackage rec {
     homepage = "https://github.com/nschloe/perfplot";
     license = licenses.mit;
     maintainers = with maintainers; [ costrouc ];
+    broken = true; # missing matplotx dependency
   };
 }
diff --git a/pkgs/development/python-modules/sqlalchemy/default.nix b/pkgs/development/python-modules/sqlalchemy/default.nix
index 085195f5a752..1d6406c5db13 100644
--- a/pkgs/development/python-modules/sqlalchemy/default.nix
+++ b/pkgs/development/python-modules/sqlalchemy/default.nix
@@ -13,11 +13,11 @@
 
 buildPythonPackage rec {
   pname = "SQLAlchemy";
-  version = "1.4.29";
+  version = "1.4.31";
 
   src = fetchPypi {
     inherit pname version;
-    sha256 = "sha256:+iutFOFHS6ZJz8lpwdLskV3T55Z380a7/gjpPvkCCzk=";
+    sha256 = "sha256-WCtZ0eV4CkR6raIrRh5QtASp3AV2jaHYc2itgZBGhBg=";
   };
 
   propagatedBuildInputs = [