diff --git a/nix/default.nix b/nix/default.nix
index b5e538d..4ebf73b 100644
--- a/nix/default.nix
+++ b/nix/default.nix
@@ -1,5 +1,5 @@
 { lib, stdenv, nim, which, pkg-config, writeScriptBin,
-  openssl, miniupnpc, libnatpmp, darwin ? null,
+  openssl, miniupnpc, libnatpmp,
   src,         # logos-chat source (self from flake, with submodules=1)
   libchatDrv,  # result of libchat.nix
   librln }:    # result of librln.nix
@@ -43,12 +43,7 @@ in stdenv.mkDerivation {
   # which doesn't exist. Point XDG_CACHE_HOME at /tmp so Nim writes its cache there.
   XDG_CACHE_HOME = "/tmp";
 
-  buildInputs = [ openssl miniupnpc libnatpmp ]
-    ++ lib.optionals stdenv.isDarwin (with darwin.apple_sdk.frameworks; [
-      Security
-      CoreFoundation
-      SystemConfiguration
-    ]);
+  buildInputs = [ openssl miniupnpc libnatpmp ];
 
   configurePhase = ''
     runHook preConfigure
diff --git a/nix/libchat.nix b/nix/libchat.nix
index 1a7fc44..393b6d0 100644
--- a/nix/libchat.nix
+++ b/nix/libchat.nix
@@ -1,5 +1,4 @@
-{ lib, stdenv, rust-bin, makeRustPlatform, perl, pkg-config, cmake,
-  darwin ? null }:
+{ lib, stdenv, rust-bin, makeRustPlatform, perl, pkg-config, cmake }:
 
 let
   rustToolchain = rust-bin.fromRustupToolchainFile ../vendor/libchat/rust_toolchain.toml;
@@ -20,10 +19,6 @@ in rPlatform.buildRustPackage {
   };
 
   nativeBuildInputs = [ perl pkg-config cmake ];
-  buildInputs = lib.optionals stdenv.isDarwin (with darwin.apple_sdk.frameworks; [
-    Security
-    SystemConfiguration
-  ]);
   doCheck = false;
 
   installPhase = ''
diff --git a/nix/librln.nix b/nix/librln.nix
index 21923ee..ee83d67 100644
--- a/nix/librln.nix
+++ b/nix/librln.nix
@@ -12,7 +12,7 @@ let
     "x86_64-linux"   = "sha256-FVXW7HHbmxxp6vy7Ji5iy0Y483P9JJXUnkyE84j3gZk=";
     "aarch64-linux"  = "sha256-E5dir4E/UT0XiaKJxnEXRz9pIGRwWHr5fHkRPYN6T80=";
     "x86_64-darwin"  = "sha256-FyuXn7hlecZMDhghE6CknVWNN9JMOADzVUVIUxknO78=";
-    "aarch64-darwin" = "sha256-8buoDdGtPDtrVQh7oIpmd9OYqTkS5byGgjo7zhNLn84=";
+    "aarch64-darwin" = "sha256-q8O4NXA+czpq6faFi4E44pl4rGe3DUHflIvBwWZ/ngI=";
   };
   triplet = triplets.${stdenv.hostPlatform.system};
   tarball = fetchurl {
diff --git a/nix/shell.nix b/nix/shell.nix
index 97c9f27..ea5a5e8 100644
--- a/nix/shell.nix
+++ b/nix/shell.nix
@@ -2,18 +2,15 @@
 
 let
   libExt = if stdenv.isDarwin then "dylib" else "so";
-  darwinDeps = lib.optionals stdenv.isDarwin (with pkgs.darwin.apple_sdk.frameworks; [
-    Security CoreFoundation SystemConfiguration
-  ]);
 in pkgs.mkShell {
   buildInputs = with pkgs; [
     nim cargo rustc clippy rustfmt
     git cmake gnumake which pkg-config
     openssl miniupnpc libnatpmp
-  ] ++ darwinDeps;
+  ];
 
   shellHook = ''
-    export CONVERSATIONS_LIB="${libchatDrv}/lib/liblogos_chat.${libExt}"
+    export CONVERSATIONS_LIB="${libchatDrv}/lib/liblibchat.${libExt}"
     echo "logos-chat dev shell. CONVERSATIONS_LIB=$CONVERSATIONS_LIB"
     echo "Build: make liblogoschat"
     echo "Nix build: nix build '.?submodules=1#'"
diff --git a/vendor/nim-ffi b/vendor/nim-ffi
index c2c03f1..bb8a3e7 160000
--- a/vendor/nim-ffi
+++ b/vendor/nim-ffi
@@ -1 +1 @@
-Subproject commit c2c03f1f0f300ec3aab8b733fe97575f452f6133
+Subproject commit bb8a3e7e221c36effd528605a6eb8ecd0f8b22dd