diff --git a/pkgs/os-specific/linux/firmware/b43-firmware/5.1.138.nix b/pkgs/os-specific/linux/firmware/b43-firmware/5.1.138.nix
index 62ba72222d4b..e4b10e79d42d 100644
--- a/pkgs/os-specific/linux/firmware/b43-firmware/5.1.138.nix
+++ b/pkgs/os-specific/linux/firmware/b43-firmware/5.1.138.nix
@@ -4,18 +4,13 @@
   fetchurl,
   b43FirmwareCutter,
 }:
-
-let
-  version = "5.100.138";
-in
-
-stdenvNoCC.mkDerivation {
+stdenvNoCC.mkDerivation (finalAttrs: {
   pname = "b43-firmware";
-  inherit version;
+  version = "5.100.138";
 
   src = fetchurl {
-    url = "http://www.lwfinger.com/b43-firmware/broadcom-wl-${version}.tar.bz2";
-    sha256 = "0vz4ka8gycf72gmnaq61k8rh8y17j1wm2k3fidxvcqjvmix0drzi";
+    url = "https://github.com/minios-linux/b43-firmware/releases/download/b43-firmware/broadcom-wl-${finalAttrs.version}.tar.bz2";
+    hash = "sha256-8ecGeqxbYrZ7i25MUXmQJ3gEM5rBYGXrE8cx/5Ca5G8=";
   };
 
   nativeBuildInputs = [ b43FirmwareCutter ];
@@ -29,5 +24,6 @@ stdenvNoCC.mkDerivation {
     description = "Firmware for cards supported by the b43 kernel module";
     homepage = "https://wireless.wiki.kernel.org/en/users/drivers/b43";
     license = lib.licenses.unfree;
+    sourceProvenance = with lib.sourceTypes; [ binaryFirmware ];
   };
-}
+})
diff --git a/pkgs/os-specific/linux/firmware/b43-firmware/6.30.163.46.nix b/pkgs/os-specific/linux/firmware/b43-firmware/6.30.163.46.nix
index b85f5f60385c..34b3e8cf2775 100644
--- a/pkgs/os-specific/linux/firmware/b43-firmware/6.30.163.46.nix
+++ b/pkgs/os-specific/linux/firmware/b43-firmware/6.30.163.46.nix
@@ -4,14 +4,13 @@
   fetchurl,
   b43FirmwareCutter,
 }:
-
-stdenvNoCC.mkDerivation rec {
+stdenvNoCC.mkDerivation (finalAttrs: {
   pname = "b43-firmware";
   version = "6.30.163.46";
 
   src = fetchurl {
-    url = "http://www.lwfinger.com/b43-firmware/broadcom-wl-${version}.tar.bz2";
-    sha256 = "0baw6gcnrhxbb447msv34xg6rmlcj0gm3ahxwvdwfcvq4xmknz50";
+    url = "https://github.com/minios-linux/b43-firmware/releases/download/b43-firmware/broadcom-wl-${finalAttrs.version}.tar.bz2";
+    hash = "sha256-oHw7ayd4M8fb5h2qUR+QjNZsXidj63oIWavDbNkzXC0=";
   };
 
   nativeBuildInputs = [ b43FirmwareCutter ];
@@ -28,5 +27,6 @@ stdenvNoCC.mkDerivation rec {
     homepage = "https://wireless.wiki.kernel.org/en/users/drivers/b43";
     downloadPage = "http://www.lwfinger.com/b43-firmware";
     license = lib.licenses.unfree;
+    sourceProvenance = with lib.sourceTypes; [ binaryFirmware ];
   };
-}
+})