diff --git a/pkgs/applications/misc/cura/default.nix b/pkgs/applications/misc/cura/default.nix
index 32b9085b3de2..521da8e2f8e9 100644
--- a/pkgs/applications/misc/cura/default.nix
+++ b/pkgs/applications/misc/cura/default.nix
@@ -3,13 +3,13 @@
 
 mkDerivation rec {
   pname = "cura";
-  version = "4.10.0";
+  version = "4.12.1";
 
   src = fetchFromGitHub {
     owner = "Ultimaker";
     repo = "Cura";
     rev = version;
-    sha256 = "0v65xg31rw4kc7f98k8zz0kmhrp9m55k8ahblha9r1vr4krcf30z";
+    sha256 = "sha256-QvX9o1nrYmY6zzPcxl+xD6JTMdphzT/is1SMYrISu4o=";
   };
 
   materials = fetchFromGitHub {
diff --git a/pkgs/applications/misc/curaengine/default.nix b/pkgs/applications/misc/curaengine/default.nix
index d0dfde5b3820..c6af30b78552 100644
--- a/pkgs/applications/misc/curaengine/default.nix
+++ b/pkgs/applications/misc/curaengine/default.nix
@@ -2,13 +2,13 @@
 
 stdenv.mkDerivation rec {
   pname = "curaengine";
-  version = "4.10.0";
+  version = "4.12.1";
 
   src = fetchFromGitHub {
     owner = "Ultimaker";
     repo = "CuraEngine";
     rev = version;
-    sha256 = "sha256-t5i6s0KKcaoMqzDxZ6JL1NyKP33uxWdmyziK3xh8q88=";
+    sha256 = "sha256-+sjysxOaNLq6p3yCoB1qKosBO5Cg2/1o7xmUtZ15wkE=";
   };
 
   nativeBuildInputs = [ cmake ];
diff --git a/pkgs/development/libraries/libnest2d/default.nix b/pkgs/development/libraries/libnest2d/default.nix
index 1e666758f816..4117b38e1d9b 100644
--- a/pkgs/development/libraries/libnest2d/default.nix
+++ b/pkgs/development/libraries/libnest2d/default.nix
@@ -1,7 +1,7 @@
 { lib, stdenv, fetchFromGitHub, cmake, clipper, nlopt, boost, python3 }:
 
 stdenv.mkDerivation rec {
-  version = "2020-10-09-unstable";
+  version = "4.12.0";
   pname = "libnest2d";
 
   # This revision is waiting to be merged upstream
diff --git a/pkgs/development/python-modules/libarcus/default.nix b/pkgs/development/python-modules/libarcus/default.nix
index 4002f527a451..494e786e9784 100644
--- a/pkgs/development/python-modules/libarcus/default.nix
+++ b/pkgs/development/python-modules/libarcus/default.nix
@@ -4,14 +4,14 @@
 
 buildPythonPackage rec {
   pname = "libarcus";
-  version = "4.10.0";
+  version = "4.12.0";
   format = "other";
 
   src = fetchFromGitHub {
     owner = "Ultimaker";
     repo = "libArcus";
     rev = version;
-    sha256 = "1ahka8s8fjwymyr7pca7i7h51ikfr35zy4nkzfcjn946x7p0dprf";
+    sha256 = "sha256-X33ptwYj9YkVWqUDPP+Ic+hoIb+rwsLdQXvHLA9z+3w=";
   };
 
   patches = [
diff --git a/pkgs/development/python-modules/libsavitar/default.nix b/pkgs/development/python-modules/libsavitar/default.nix
index e82400b565fd..588ebfcd1e95 100644
--- a/pkgs/development/python-modules/libsavitar/default.nix
+++ b/pkgs/development/python-modules/libsavitar/default.nix
@@ -2,14 +2,14 @@
 
 buildPythonPackage rec {
   pname = "libsavitar";
-  version = "4.10.0";
+  version = "4.12.0";
   format = "other";
 
   src = fetchFromGitHub {
     owner = "Ultimaker";
     repo = "libSavitar";
     rev = version;
-    sha256 = "1zyzsrdm5aazv12h7ga35amfryrbxdsmx3abvh27hixyh9f92fdp";
+    sha256 = "sha256-MAA1WtGED6lvU6N4BE6wwY1aYaFrCq/gkmQFz3VWqNA=";
   };
 
   postPatch = ''
diff --git a/pkgs/development/python-modules/pynest2d/default.nix b/pkgs/development/python-modules/pynest2d/default.nix
index 1f338806a18f..9be7072a89fb 100644
--- a/pkgs/development/python-modules/pynest2d/default.nix
+++ b/pkgs/development/python-modules/pynest2d/default.nix
@@ -2,7 +2,7 @@
 , libnest2d, sip_4, clipper }:
 
 buildPythonPackage rec {
-  version = "4.10.0";
+  version = "4.12.0";
   pname = "pynest2d";
   format = "other";
 
@@ -10,7 +10,7 @@ buildPythonPackage rec {
     owner = "Ultimaker";
     repo = "pynest2d";
     rev = version;
-    sha256 = "03aj0whxj9rs9nz3idld7w4vpmnr6vr40vpwmzcf5w2pi2n4z4lk";
+    sha256 = "sha256-QQdTDhO4i9NVhegGTmdEQSNv3gooaZzTX/Rv86h3GEo=";
   };
 
   propagatedBuildInputs = [ libnest2d sip_4 clipper ];
diff --git a/pkgs/development/python-modules/uranium/default.nix b/pkgs/development/python-modules/uranium/default.nix
index a8ce6713f2c0..58b96b5cd7a4 100644
--- a/pkgs/development/python-modules/uranium/default.nix
+++ b/pkgs/development/python-modules/uranium/default.nix
@@ -2,7 +2,7 @@
 , pyqt5, numpy, scipy, shapely, libarcus, cryptography, doxygen, gettext, pythonOlder }:
 
 buildPythonPackage rec {
-  version = "4.10.0";
+  version = "4.12.0";
   pname = "uranium";
   format = "other";
 
@@ -10,7 +10,7 @@ buildPythonPackage rec {
     owner = "Ultimaker";
     repo = "Uranium";
     rev = version;
-    sha256 = "0bxbkqc4ajs52vmalmhvvqvl1aw2ss6yf7nclwx8nc2g5vchd4ng";
+    sha256 = "sha256-SE9xqrloPXIRTJiiqUdRKFmb4c0OjmJK5CMn6VXMFmk=";
   };
 
   disabled = pythonOlder "3.5.0";