diff --git a/pkgs/by-name/fl/flightgear/openscenegraph-flightgear.nix b/pkgs/by-name/fl/flightgear/openscenegraph-flightgear.nix
index 7cbbb965b2de..655fa0ed57d9 100644
--- a/pkgs/by-name/fl/flightgear/openscenegraph-flightgear.nix
+++ b/pkgs/by-name/fl/flightgear/openscenegraph-flightgear.nix
@@ -32,9 +32,8 @@ stdenv.mkDerivation {
   src = fetchFromGitLab {
     owner = "flightgear";
     repo = "openscenegraph";
-    # release/2024-build as of 2025-08-08
-    rev = "a4ea8ec535cc969e31e2026b13be147dcb978689";
-    sha256 = "sha256-wnxm4G40j2e6Paqx0vfAR4s4L7esfCHcgxUJWNxk1SM=";
+    rev = "b5895abe0d94a57839929d38b5681dc8e796a8a0";
+    hash = "sha256-FaTn+QZa1qAU9DNhBjQvBLu/Z9q2liatBbsxY8a0hUI=";
   };
 
   nativeBuildInputs = [
@@ -84,13 +83,19 @@ stdenv.mkDerivation {
   ++ lib.optional stdenv.hostPlatform.isDarwin (lib.cmakeFeature "OSG_WINDOWING_SYSTEM" "Cocoa");
 
   meta = {
-    description = "3D graphics toolkit";
-    homepage = "http://www.openscenegraph.org/";
+    description = "3D graphics toolkit (FlightGear fork)";
+    homepage = "https://gitlab.com/flightgear/openscenegraph";
+    changelog = "https://gitlab.com/flightgear/openscenegraph/-/commits/release/2024-build";
     maintainers = with lib.maintainers; [
       aanderse
       raskin
     ];
     platforms = with lib.platforms; linux ++ darwin;
-    license = "OpenSceneGraph Public License - free LGPL-based license";
+
+    # This is a fork of openscenegraph, mirrored licenses
+    license = with lib.licenses; [
+      lgpl21Only
+      wxWindowsException31
+    ];
   };
 }
diff --git a/pkgs/by-name/fl/flightgear/package.nix b/pkgs/by-name/fl/flightgear/package.nix
index 514705cf3d3a..cec1a8b4e162 100644
--- a/pkgs/by-name/fl/flightgear/package.nix
+++ b/pkgs/by-name/fl/flightgear/package.nix
@@ -35,37 +35,17 @@
 }:
 
 let
-  version = "2024.1.5";
-  data = stdenv.mkDerivation rec {
-    pname = "flightgear-data";
-    inherit version;
-
-    src = fetchFromGitLab {
-      owner = "flightgear";
-      repo = "fgdata";
-      tag = version;
-      hash = "sha256-8B5wSYjkWuPEySpqBiprZ+jrHy01HA9+iX70wNAn81s=";
-    };
-
-    dontUnpack = true;
-
-    installPhase = ''
-      mkdir -p "$out/share/FlightGear"
-      cp ${src}/* -a "$out/share/FlightGear/"
-    '';
-  };
   openscenegraph = callPackage ./openscenegraph-flightgear.nix { };
 in
-stdenv.mkDerivation rec {
+stdenv.mkDerivation (finalAttrs: {
   pname = "flightgear";
-  # inheriting data for `nix-prefetch-url -A pkgs.flightgear.data.src`
-  inherit version data;
+  version = "2024.1.6-rc1";
 
   src = fetchFromGitLab {
     owner = "flightgear";
     repo = "flightgear";
-    tag = version;
-    hash = "sha256-sORiO0SDChIVWIhGKelm7IE/cZ40gMqlZ1OoZZna7kI=";
+    tag = finalAttrs.version;
+    hash = "sha256-YYWDLCZ+2g4sWrSZJ+EvFCPH/IIYWD0wKzcslqw9VSs=";
   };
 
   nativeBuildInputs = [
@@ -111,7 +91,7 @@ stdenv.mkDerivation rec {
     lib.cmakeFeature "CMAKE_OSX_DEPLOYMENT_TARGET" "11.0"
   );
 
-  qtWrapperArgs = [ "--set FG_ROOT ${data}/share/FlightGear" ];
+  qtWrapperArgs = [ "--set FG_ROOT ${finalAttrs.passthru.data}/share/FlightGear" ];
 
   postInstall = ''
     # Remove redundant AppImage artifacts
@@ -127,17 +107,41 @@ stdenv.mkDerivation rec {
     ln -s "$out/Applications/FlightGear.app/Contents/MacOS/FlightGear" "$out/bin/fgfs"
   '';
 
-  passthru.updateScript = nix-update-script { };
+  passthru = {
+    updateScript = nix-update-script { };
+
+    data = stdenv.mkDerivation {
+      pname = "flightgear-data";
+      inherit (finalAttrs) version;
+
+      src = fetchFromGitLab {
+        owner = "flightgear";
+        repo = "fgdata";
+        tag = finalAttrs.version;
+        hash = "sha256-B7WCEMrHtSW4Yk2HM+ZjgKt5GeQrSmvxKITqAYXKSuw=";
+      };
+
+      dontUnpack = true;
+
+      installPhase = ''
+        mkdir -p "$out/share/FlightGear"
+        cp -a "$src"/* "$out/share/FlightGear/"
+      '';
+    };
+  };
 
   meta = {
-    description = "Flight simulator";
+    description = "A free and highly sophisticated flight simulator";
+    homepage = "https://www.flightgear.org/";
+    changelog = "https://www.flightgear.org/download/releases/2024-1-5"; # TODO: Use finalattrs when back on stable tracking
     maintainers = with lib.maintainers; [
       raskin
       kirillrdy
+      philocalyst
     ];
     platforms = lib.platforms.linux ++ lib.platforms.darwin;
     hydraPlatforms = [ ]; # disabled from hydra because it's so big
     license = lib.licenses.gpl2Plus;
     mainProgram = "fgfs";
   };
-}
+})
diff --git a/pkgs/by-name/si/simgear/package.nix b/pkgs/by-name/si/simgear/package.nix
index c7c0682e52fb..3ad9309f076f 100644
--- a/pkgs/by-name/si/simgear/package.nix
+++ b/pkgs/by-name/si/simgear/package.nix
@@ -27,18 +27,16 @@
   curl,
   c-ares,
 }:
-let
-  version = "2024.1.5";
-in
+
 stdenv.mkDerivation (finalAttrs: {
   pname = "simgear";
-  inherit version;
+  version = "2024.1.6-rc1";
 
   src = fetchFromGitLab {
     owner = "flightgear";
     repo = "simgear";
     tag = finalAttrs.version;
-    hash = "sha256-WONlVdfDWIcoj/UfcFA4Vw5edlgr0vlT/fjIPDti7fk=";
+    hash = "sha256-uj8yVJNjAsrO0ydL5xMVtRRqx+5mXZ60qrPW2BAHl0g=";
   };
 
   nativeBuildInputs = [ cmake ];