diff --git a/lock.nix b/lock.nix
index 821100a..a0a1268 100644
--- a/lock.nix
+++ b/lock.nix
@@ -4,12 +4,12 @@
     sha256 = "sha256-DlvJv33ml5UTKgu4b0HauOfFIoDx6QXtbqUF3vWeRCY=";
   };
   nixpkgs = {
-    revision = "7282cb574e0607e65224d33be8241eae7cfe0979";
-    sha256 = "sha256-hYKMs3ilp09anGO7xzfGs3JqEgUqFMnZ8GMAqI6/k04=";
+    revision = "8f1b52b04f2cb6e5ead50bd28d76528a2f0380ef";
+    sha256 = "sha256-OGcDEz60TXQC+gVz5sdtgGJdKVYr6rwdzQKuZAJQpCA=";
   };
   nixpkgs-unstable = {
-    revision = "96ec055edbe5ee227f28cdbc3f1ddf1df5965102";
-    sha256 = "sha256-7doLyJBzCllvqX4gszYtmZUToxKvMUrg45EUWaUYmBg=";
+    revision = "c2a03962b8e24e669fb37b7df10e7c79531ff1a4";
+    sha256 = "sha256-lcZQ8RhsmhsK8u7LIFsJhsLh/pzR9yZ8yqpTzyGdj+Q=";
   };
   nix-bitcoin = {
     revision = "a06d1d8118865af14a9187e7d1a7a141dd89af74";
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 4b40bcb..416b778 100644
--- a/pkgs/overlays/unstable-from-source.nix
+++ b/pkgs/overlays/unstable-from-source.nix
@@ -32,9 +32,9 @@ let
     # config -> pkgs.config
     config = self.config;
     # overlays -> pkgs.buildPackages.overlays
-    overlays = overlays.allLayers;
+    overlays = overlays.allLayers or [];
     # crossOverlays -> pkgs.overlays without pkgs.buildPackages.overlays
-    crossOverlays = overlays.finalLayer;
+    crossOverlays = overlays.finalLayer or [];
   } // self.lib.optionalAttrs (
     self.lib.systems.equals self.stdenv.buildPlatform self.stdenv.hostPlatform
   ) {