diff --git a/pkgs/development/python-modules/pyobjc-core/default.nix b/pkgs/development/python-modules/pyobjc-core/default.nix
index 6b70120c077f..e07a01289f74 100644
--- a/pkgs/development/python-modules/pyobjc-core/default.nix
+++ b/pkgs/development/python-modules/pyobjc-core/default.nix
@@ -8,14 +8,14 @@
 
 buildPythonPackage rec {
   pname = "pyobjc-core";
-  version = "12.1";
+  version = "11.1";
   pyproject = true;
 
   src = fetchFromGitHub {
     owner = "ronaldoussoren";
     repo = "pyobjc";
     tag = "v${version}";
-    hash = "sha256-mKrn8p6zP53sGCpFjBEWqGNx5MVXcE9x9nlTrzTdPBM=";
+    hash = "sha256-2qPGJ/1hXf3k8AqVLr02fVIM9ziVG9NMrm3hN1de1Us=";
   };
 
   sourceRoot = "${src.name}/pyobjc-core";
diff --git a/pkgs/development/python-modules/pyobjc-framework-Quartz/default.nix b/pkgs/development/python-modules/pyobjc-framework-Quartz/default.nix
index ee4d328f8398..0c238cbb69d0 100644
--- a/pkgs/development/python-modules/pyobjc-framework-Quartz/default.nix
+++ b/pkgs/development/python-modules/pyobjc-framework-Quartz/default.nix
@@ -10,14 +10,14 @@
 
 buildPythonPackage rec {
   pname = "pyobjc-framework-Quartz";
-  version = "12.1";
+  version = "11.1";
   pyproject = true;
 
   src = fetchFromGitHub {
     owner = "ronaldoussoren";
     repo = "pyobjc";
     tag = "v${version}";
-    hash = "sha256-mKrn8p6zP53sGCpFjBEWqGNx5MVXcE9x9nlTrzTdPBM=";
+    hash = "sha256-2qPGJ/1hXf3k8AqVLr02fVIM9ziVG9NMrm3hN1de1Us=";
   };
 
   sourceRoot = "${src.name}/pyobjc-framework-Quartz";
diff --git a/pkgs/development/python-modules/pyobjc-framework-Security/default.nix b/pkgs/development/python-modules/pyobjc-framework-Security/default.nix
index 2860a0b0fee6..8209ff78bd8d 100644
--- a/pkgs/development/python-modules/pyobjc-framework-Security/default.nix
+++ b/pkgs/development/python-modules/pyobjc-framework-Security/default.nix
@@ -10,14 +10,14 @@
 
 buildPythonPackage rec {
   pname = "pyobjc-framework-Security";
-  version = "12.1";
+  version = "11.1";
   pyproject = true;
 
   src = fetchFromGitHub {
     owner = "ronaldoussoren";
     repo = "pyobjc";
     tag = "v${version}";
-    hash = "sha256-mKrn8p6zP53sGCpFjBEWqGNx5MVXcE9x9nlTrzTdPBM=";
+    hash = "sha256-2qPGJ/1hXf3k8AqVLr02fVIM9ziVG9NMrm3hN1de1Us=";
   };
 
   sourceRoot = "${src.name}/pyobjc-framework-Security";
diff --git a/pkgs/development/python-modules/pyobjc-framework-WebKit/default.nix b/pkgs/development/python-modules/pyobjc-framework-WebKit/default.nix
index a31db7779b49..9e466395e469 100644
--- a/pkgs/development/python-modules/pyobjc-framework-WebKit/default.nix
+++ b/pkgs/development/python-modules/pyobjc-framework-WebKit/default.nix
@@ -10,14 +10,14 @@
 
 buildPythonPackage rec {
   pname = "pyobjc-framework-WebKit";
-  version = "12.1";
+  version = "11.1";
   pyproject = true;
 
   src = fetchFromGitHub {
     owner = "ronaldoussoren";
     repo = "pyobjc";
     tag = "v${version}";
-    hash = "sha256-mKrn8p6zP53sGCpFjBEWqGNx5MVXcE9x9nlTrzTdPBM=";
+    hash = "sha256-2qPGJ/1hXf3k8AqVLr02fVIM9ziVG9NMrm3hN1de1Us=";
   };
 
   sourceRoot = "${src.name}/pyobjc-framework-WebKit";