diff --git a/pkgs/development/python-modules/plotnine/default.nix b/pkgs/development/python-modules/plotnine/default.nix
index fb86d44472d2..6368f8c66785 100644
--- a/pkgs/development/python-modules/plotnine/default.nix
+++ b/pkgs/development/python-modules/plotnine/default.nix
@@ -17,7 +17,7 @@
 
 buildPythonPackage rec {
   pname = "plotnine";
-  version = "0.13.5";
+  version = "0.13.6";
   pyproject = true;
 
   disabled = pythonOlder "3.9";
@@ -26,7 +26,7 @@ buildPythonPackage rec {
     owner = "has2k1";
     repo = "plotnine";
     rev = "refs/tags/v${version}";
-    hash = "sha256-vGxsBcY4CRT4rBUq0AQ4oo0etKK+CtUD487VvnoK/rI=";
+    hash = "sha256-/yxRYK3ZTrYj+l3TQhFllyICnJjCZPd4ebNurCLZAYg=";
   };
 
   postPatch = ''
@@ -57,6 +57,12 @@ buildPythonPackage rec {
 
   pythonImportsCheck = [ "plotnine" ];
 
+  disabledTests = [
+    # Tries to change locale. The issued warning causes this test to fail.
+    # UserWarning: Could not set locale to English/United States. Some date-related tests may fail
+    "test_no_after_scale_warning"
+  ];
+
   disabledTestPaths = [
     # Assertion Errors:
     # Generated plot images do not exactly match the expected files.
diff --git a/pkgs/development/python-modules/statsmodels/default.nix b/pkgs/development/python-modules/statsmodels/default.nix
index e3f40a5cff31..24dc020859d8 100644
--- a/pkgs/development/python-modules/statsmodels/default.nix
+++ b/pkgs/development/python-modules/statsmodels/default.nix
@@ -10,6 +10,7 @@
 , scipy
 , setuptools
 , setuptools-scm
+, stdenv
 }:
 
 buildPythonPackage rec {
@@ -57,5 +58,7 @@ buildPythonPackage rec {
     homepage = "https://www.github.com/statsmodels/statsmodels";
     changelog = "https://github.com/statsmodels/statsmodels/releases/tag/v${version}";
     license = licenses.bsd3;
+    # Fails at build time
+    broken = stdenv.isDarwin;
   };
 }