diff --git a/nix/cargo-pgrx/versions.json b/nix/cargo-pgrx/versions.json
index 2a4e24192..c78ba8bc2 100644
--- a/nix/cargo-pgrx/versions.json
+++ b/nix/cargo-pgrx/versions.json
@@ -56,6 +56,17 @@
         "cargoHash": "sha256-Ny7j56pwB+2eEK62X0nWfFKQy5fBz+Q1oyvecivxLkk="
       }
     }
+  },
+  "0.15.0": {
+    "hash": "sha256-sksRfNV6l8YbdI6fzrEtanpDVV4sh14JXLqYBydHwy0=",
+    "rust": {
+      "1.85.0": {
+        "cargoHash": "sha256-4a7jz8+/HeOmEEWRadbFzEhAoYEd8Oj30vso5KYnDbs="
+      },
+      "1.87.0": {
+        "cargoHash": "sha256-TODO-NEEDS-PROPER-HASH"
+      }
+    }
   }
 
 }
diff --git a/nix/ext/kilobase.nix b/nix/ext/kilobase.nix
index 5cdd0d63d..b61450f3a 100644
--- a/nix/ext/kilobase.nix
+++ b/nix/ext/kilobase.nix
@@ -1,15 +1,11 @@
 {
   lib,
   stdenv,
+  pkgs,
   fetchFromGitHub,
   postgresql,
   buildPgrxExtension_0_15_0,
-  rust-bin,
 }:
-let
-  rustVersion = "1.85.0"; # Updated to support edition 2024
-  cargo = rust-bin.stable.${rustVersion}.default;
-in
 buildPgrxExtension_0_15_0 rec {
   pname = "kilobase";
   version = "0.1.0";
@@ -19,13 +15,16 @@ buildPgrxExtension_0_15_0 rec {
     owner = "KBVE";
     repo = "kbve";
     rev = "main"; # Use main branch or specific commit hash
-    hash = "sha256-AKsvBd1UR28/o269Ys3lZzYkCRXXZrIgurE9C9lsW+Y=";
+    hash = "sha256-VVH9GyKgKgkvi3iI8SffScPl00cIDlvPZbVJLgrzX1o=";
   };
 
-  # Cargo.toml path if not at root
-  cargoRoot = "apps/kbve/kilobase";
+  # Build from workspace root (with Rust 1.85 we support edition 2024)
+  cargoRoot = ".";
+  
+  # Build only kilobase package - but don't use --package flag as buildAndTestSubdir handles it
+  cargoBuildFlags = [ ];
 
-  nativeBuildInputs = [ cargo ];
+  nativeBuildInputs = [ ];
   buildInputs = [ postgresql ];
 
   # Update this array when kilobase version is updated
@@ -33,8 +32,6 @@ buildPgrxExtension_0_15_0 rec {
     # Add previous versions here when updating
   ];
 
-  CARGO = "${cargo}/bin/cargo";
-
   # Darwin env needs PGPORT to be unique for build to not clash with other pgrx extensions
   env = lib.optionalAttrs stdenv.isDarwin {
     POSTGRES_LIB = "${postgresql}/lib";
@@ -49,13 +46,19 @@ buildPgrxExtension_0_15_0 rec {
   cargoLock = {
     lockFile = "${src}/Cargo.lock";
     allowBuiltinFetchGit = true;
-    outputHashes = {
-      "jedi-0.2.0" = "sha256-23u6jB89ok7UUQMcHOcYA/4Lwq59JMEXbVx3gGPGOks=";
-    };
   };
 
+  # Add pg17 feature
+  buildFeatures = [ "pg17" ];
+
   # Disable tests for now
   doCheck = false;
+  
+  # Disable cargo-auditable to avoid issues
+  auditable = false;
+  
+  # Tell cargo pgrx package which package to build
+  buildAndTestSubdir = "apps/kbve/kilobase";
 
   meta = with lib; {
     description = "Kilobase PostgreSQL extension";
diff --git a/nix/overlays/default.nix b/nix/overlays/default.nix
index 90e5d25f1..7d761c1e6 100644
--- a/nix/overlays/default.nix
+++ b/nix/overlays/default.nix
@@ -52,8 +52,14 @@
       cargo-pgrx = final.cargo-pgrx.cargo-pgrx_0_14_3;
     };
 
-    buildPgrxExtension_0_15_0 = prev.buildPgrxExtension.override {
-      cargo-pgrx = final.cargo-pgrx.cargo-pgrx_0_15_0;
-    };
+    buildPgrxExtension_0_15_0 = 
+      let
+        rustVersion = "1.85.0";
+        pgrxVersion = "0.15.0";
+        mkPgrxExtension = final.callPackages ../cargo-pgrx/mkPgrxExtension.nix {
+          inherit rustVersion pgrxVersion;
+        };
+      in
+      mkPgrxExtension;
   };
 }