diff --git a/lock.nix b/lock.nix
index 64f2376..ec4adc3 100644
--- a/lock.nix
+++ b/lock.nix
@@ -4,19 +4,19 @@
     sha256 = "sha256-DlvJv33ml5UTKgu4b0HauOfFIoDx6QXtbqUF3vWeRCY=";
   };
   nixpkgs = {
-    revision = "55d1f923c480dadce40f5231feb472e81b0bab48";
-    sha256 = "sha256-y2ZtlIlNTuVJUZCqzZAhIw5rrKP4DOSklev6c8PyCkQ=";
+    revision = "36ab78dab7da2e4e27911007033713bab534187b";
+    sha256 = "sha256-urV51uWH7fVnhIvsZIELIYalMYsyr2FCalvlRTzqWRw=";
   };
   nixpkgs-unstable = {
-    revision = "2795c506fe8fb7b03c36ccb51f75b6df0ab2553f";
-    sha256 = "sha256-W7lqHp0qZiENCDwUZ5EX/lNhxjMdNapFnbErcbnP11Q=";
+    revision = "9e83b64f727c88a7711a2c463a7b16eedb69a84c";
+    sha256 = "sha256-v263g4GbxXv87hMXMCpjkIxd/viIF7p3JpJrwgKdNiI=";
   };
   nix-bitcoin = {
-    revision = "e7e6353b3a72205b037be53eda2e71e24e46b45e";
-    sha256 = "sha256-Y53kyw7CQUEUiKPVQQzCMB4OIiZtOoFNurJhhM6Xvx4=";
+    revision = "ac1344fb6d91e2af219803eaaa67d1d974666156";
+    sha256 = "sha256-qLwBEXlGY2pLNPhPNpeOE0DNC1luovTYE3ZDPMyMPXc=";
   };
   cosmic-modules = {
-    revision = "e3bea95daa167bf84a4bf3387ef6f01f081152b6";
-    sha256 = "sha256-QhmqgiAGqR7VYxyNsdpR2qfejRnviyf7ElZ8v8MtwwY=";
+    revision = "ef3b52e04d4294aa98fdac6c065b2d818022efd1";
+    sha256 = "sha256-zuONfwNObFx8A2zunwwkW2jUgO6rvd6dO2okiiCxPO8=";
   };
 }
diff --git a/nixos/modules/core-desktop.nix b/nixos/modules/core-desktop.nix
index 72a1f33..d81ceec 100644
--- a/nixos/modules/core-desktop.nix
+++ b/nixos/modules/core-desktop.nix
@@ -27,12 +27,7 @@
       kdePackages.kdeconnect-kde
       pcmanfm
       pwvucontrol
-      (qimgv.override {
-        opencv4 = opencv4.override {
-          # https://github.com/NixOS/nixpkgs/issues/383175
-          enableCuda = false;
-        };
-      })
+      qimgv
     ];
 
     programs.mpv = let
diff --git a/nixos/modules/nvidia.nix b/nixos/modules/nvidia.nix
index afd3d33..ad6f2db 100644
--- a/nixos/modules/nvidia.nix
+++ b/nixos/modules/nvidia.nix
@@ -24,12 +24,18 @@
       nvidiaSettings = true;
       package = let
         mkDriverArgs = {
-          version = "575.51.02";
-          sha256_64bit = "sha256-XZ0N8ISmoAC8p28DrGHk/YN1rJsInJ2dZNL8O+Tuaa0=";
-          sha256_aarch64 = "sha256-NNeQU9sPfH1sq3d5RUq1MWT6+7mTo1SpVfzabYSVMVI=";
-          openSha256 = "sha256-NQg+QDm9Gt+5bapbUO96UFsPnz1hG1dtEwT/g/vKHkw=";
-          settingsSha256 = "sha256-6n9mVkEL39wJj5FB1HBml7TTJhNAhS/j5hqpNGFQE4w=";
-          persistencedSha256 = "sha256-dgmco+clEIY8bedxHC4wp+fH5JavTzyI1BI8BxoeJJI=";
+          version = "575.64";
+          sha256_64bit = "sha256-6wG8/nOwbH0ktgg8J+ZBT2l5VC8G5lYBQhtkzMCtaLE=";
+          sha256_aarch64 = "sha256-uHj8fB1sSJfX0NWZEE1eZN1LQQkf7J0jPV3EeQCSG10=";
+          openSha256 = "sha256-y93FdR5TZuurDlxc/p5D5+a7OH93qU4hwQqMXorcs/g=";
+          settingsSha256 = "sha256-3BvryH7p0ioweNN4S8oLDCTSS47fQPWVYwNq4AuWQgQ=";
+          persistencedSha256 = "sha256-QkDNQKwCsakZOLcSie1NBiFCM5e5NFGiIKtPSFeWdXs=";
+          patches = [
+            (pkgs.fetchpatch {
+              url = "https://raw.githubusercontent.com/rpmfusion/nvidia-kmod/020f5fabfb067150f8dd0d6e470a7a694f59eb59/Workaround-nv_vm_flags_-calling-GPL-only-code.patch";
+              hash = "sha256-2WQs8WDVzNivwUSWn7t2hoduUVvmem5e+JpGt04380c=";
+            })
+          ];
         };
       in ( config.boot.kernelPackages.nvidiaPackages.mkDriver mkDriverArgs ).overrideAttrs (super: {
         passthru = super.passthru or {} // {
diff --git a/nixos/modules/razer.nix b/nixos/modules/razer.nix
index f299e95..cfcda07 100644
--- a/nixos/modules/razer.nix
+++ b/nixos/modules/razer.nix
@@ -15,14 +15,14 @@
       # NIXPKGS-PR: 384992
       packages = let
         oldVersion = pkgs.python3Packages.openrazer-daemon.version;
-        version = "3.10.1";
+        version = "3.10.3";
       in lib.mapAttrs (_: package: package.overrideAttrs (oldAttrs: {
         version = lib.replaceStrings [ oldVersion ] [ version ] oldAttrs.version;
         src = pkgs.fetchFromGitHub {
           owner = "openrazer";
           repo = "openrazer";
           tag = "v${version}";
-          hash = "sha256-igrGx7Y6ENtZatJCTAW43/0q6ZjljJ9/kU3QFli4yIU=";
+          hash = "sha256-M5g3Rn9WuyudhWQfDooopjexEgGVB0rzfJsPg+dqwn4=";
         };
       })) {
         kernel = config.boot.kernelPackages.openrazer;
diff --git a/nixos/modules/shell.nix b/nixos/modules/shell.nix
index 891e3b9..2c70c93 100644
--- a/nixos/modules/shell.nix
+++ b/nixos/modules/shell.nix
@@ -15,7 +15,17 @@ in
       aliasDrag
       ranger-git
       ripgrep
-      kitty
+      (kitty.overrideAttrs (superAttrs: {
+        patches = superAttrs.patches or [] ++ [
+          (fetchpatch {
+            url = "https://github.com/AmirulAndalib/kitty/commit/61fd8c4003b361503160424cbed1960153f40290.patch";
+            excludes = lib.map lib.escapeRegex [
+              "docs/changelog.rst"
+            ];
+            hash = "sha256-TqO/pLRkxN+Mz4nfNfTntGpPoy6OgbtAGmdohG/1BFs=";
+          })
+        ];
+      }))
       zoxide
     ]) ++ [
       (
@@ -29,15 +39,19 @@ in
       HISTCONTROL=ignoreboth
     '';
 
-    programs.bash.interactiveShellInit = ''
-      HISTCONTROL=ignoreboth
-      if test -n "$KITTY_INSTALLATION_DIR"; then
-        export KITTY_SHELL_INTEGRATION="enabled,no-sudo"
-        source "$KITTY_INSTALLATION_DIR/shell-integration/bash/kitty.bash"
-      fi
-      eval "''$(zoxide init bash)"
-      alias bye=exit
-    '';
+    programs.bash.interactiveShellInit = lib.mkMerge [
+      ''
+        HISTCONTROL=ignoreboth
+        if test -n "$KITTY_INSTALLATION_DIR"; then
+          export KITTY_SHELL_INTEGRATION="enabled,no-sudo"
+          source "$KITTY_INSTALLATION_DIR/shell-integration/bash/kitty.bash"
+        fi
+        alias bye=exit
+      ''
+      (lib.mkAfter ''
+        eval "''$(${lib.getExe pkgs.zoxide} init bash)"
+      '')
+    ];
 
     environment.etc."xdg/kitty/kitty.conf".text = ''
       font_family MesloLGS Nerd Font
diff --git a/pkgs/by-name/ra/ranger-git/package.nix b/pkgs/by-name/ra/ranger-git/package.nix
index d60114a..7efb7ce 100644
--- a/pkgs/by-name/ra/ranger-git/package.nix
+++ b/pkgs/by-name/ra/ranger-git/package.nix
@@ -16,8 +16,8 @@ ranger.overrideAttrs (selfAttrs: superAttrs: {
   src = fetchFromGitHub {
     owner = "ranger";
     repo = "ranger";
-    rev = "b00f923911090204139c9e19ba42e9d80aa0889f";
-    hash = "sha256-uMvo+5I5WCJGT5+XRS/NFClDGH4F59ogQJb+RYuraX4=";
+    rev = "7e38143eaa91c82bed8f309aa167b1e6f2607576";
+    hash = "sha256-O0DjecncpN+Bv8Ng+keuvU9iVtWAV4a50p959pMvkww=";
   };
 
   patches = superAttrs.patches or [] ++ [
diff --git a/pkgs/overlays/unstable-from-source.nix b/pkgs/overlays/unstable-from-source.nix
index bca6b9f..416b778 100644
--- a/pkgs/overlays/unstable-from-source.nix
+++ b/pkgs/overlays/unstable-from-source.nix
@@ -1,6 +1,8 @@
 {
   unstableSource,
   attributeName ? "unstable",
+  # callPackage :: function | boolean
+  callPackage ? false,
 }:
 
 self: super:
@@ -15,26 +17,58 @@ let
     "parsed"
   ];
 
-  unstablePkgsForNixpkgs = nixpkgs: import unstableSource {
+  # if overlay is found in previous layer, then it was provided in "overlays" argument
+  # otherwise, it is provided in "crossOverlays" argument.
+  overlays = self.lib.groupBy (overlay:
+    if self.lib.elem overlay self.buildPackages.overlays then "allLayers"
+    else "finalLayer"
+  ) self.overlays;
+
+  unstablePkgs = import unstableSource {
     # localSystem -> pkgs.stdenv.buildPlatform
-    localSystem = sanitizePlatform nixpkgs.stdenv.buildPlatform;
+    localSystem = sanitizePlatform self.stdenv.buildPlatform;
     # crossSystem -> pkgs.stdenv.hostPlatform or pkgs.stdenv.targetPlatform ??
     # passing below
     # config -> pkgs.config
-    config = nixpkgs.config;
-    # overlays -> partial of pkgs.overlays
-    overlays = nixpkgs.overlays;
-    # crossOverlays -> partial of pkgs.overlays
-    # crossOverlays are merged to overlays, not sure what issues that might raise.
-    # ignoring.
+    config = self.config;
+    # overlays -> pkgs.buildPackages.overlays
+    overlays = overlays.allLayers or [];
+    # crossOverlays -> pkgs.overlays without pkgs.buildPackages.overlays
+    crossOverlays = overlays.finalLayer or [];
   } // self.lib.optionalAttrs (
-    self.lib.systems.equals nixpkgs.stdenv.buildPlatform nixpkgs.stdenv.hostPlatform
+    self.lib.systems.equals self.stdenv.buildPlatform self.stdenv.hostPlatform
   ) {
     # workaround for some odd structured packages that changes behaviour
     # when crossSystem is passed.
-    crossSystem = sanitizePlatform nixpkgs.stdenv.hostPlatform;
+    crossSystem = sanitizePlatform self.stdenv.hostPlatform;
   };
+
+  callPackage' = if builtins.isFunction callPackage then callPackage
+    else if builtins.isBool callPackage && callPackage then self.callPackage
+    else if builtins.isBool callPackage && !callPackage then throw "this should never be evaluated"
+    else throw ''
+      callPackage argument should be a function or a boolean.
+      If you want to use the callPackage from self, set it to true.
+      If you want to use a custom callPackage, set it to a function (pkgs.callPackage).
+    '';
+
+  callPackagesUnstablePkgs = self.lib.mapAttrsRecursiveCond (
+    attrset: !(self.lib.hasAttr "override" attrset) && attrset.recurseForDerivations or false
+  ) (
+    _: unstablePackage: callPackage' {
+      # For some reason, override functor of the package has its argument set as required,
+      # which is totally false! the override functor can take all of those arguemnts optionally.
+      __functionArgs = self.lib.mapAttrs (_: _: true) (self.lib.functionArgs unstablePackage.override);
+      __functor =
+        if builtins.isFunction unstablePackage.override then unstablePackage.override
+        else unstablePackage.override.__functor;
+    } {}
+  ) unstablePkgs;
+
 in
 {
-  "${attributeName}" = if useUnstable then unstablePkgsForNixpkgs self else self;
+  "${attributeName}" = if !useUnstable then self
+    # if callPackage is not false
+    else if !(builtins.isBool callPackage && !callPackage) then callPackagesUnstablePkgs
+    else unstablePkgs;
 }