diff --git a/cabal.project b/cabal.project
index 5df8a3dfe2..80421d01a3 100644
--- a/cabal.project
+++ b/cabal.project
@@ -3,7 +3,7 @@ packages: .
 source-repository-package
     type: git
     location: git://github.com/simplex-chat/simplexmq.git
-    tag: 229e2607d76f3d6baf0d2623b186c084e3908b8f
+    tag: 137afb68fe02ac05c439c870db7c626fb6ef7880
 
 source-repository-package
     type: git
diff --git a/flake.nix b/flake.nix
index de81fb10d8..27c1a3044f 100644
--- a/flake.nix
+++ b/flake.nix
@@ -142,6 +142,33 @@
                 '';
               };
             };
+            "x86_64-darwin" = {
+              "x86_64-darwin:lib:simplex-chat" = (drv pkgs).simplex-chat.components.library.override {
+                smallAddressSpace = true; enableShared = false;
+                # we need threaded here, otherwise all the queing logic doesn't work properly.
+                # for iOS we also use -staticlib, to get one rolled up library.
+                # still needs mac2ios patching of the archives.
+                ghcOptions = [ "-staticlib" "-threaded" ];
+                postInstall = ''
+                  ${pkgs.tree}/bin/tree $out
+                  mkdir -p $out/_pkg
+                  # copy over includes, we might want those, but maybe not.
+                  # cp -r $out/lib/*/*/include $out/_pkg/
+                  # find the libHS...ghc-X.Y.Z.a static library; this is the
+                  # rolled up one with all dependencies included.
+                  find ./dist -name "libHS*.a" -exec cp {} $out/_pkg \;
+                  find ${pkgs.libffi.overrideAttrs (old: { dontDisableStatic = true; })}/lib -name "*.a" -exec cp {} $out/_pkg \;
+                  find ${pkgs.gmp6.override { withStatic = true; }}/lib -name "*.a" -exec cp {} $out/_pkg \;
+                  # There is no static libc
+                  ${pkgs.tree}/bin/tree $out/_pkg
+                  (cd $out/_pkg; ${pkgs.zip}/bin/zip -r -9 $out/pkg.zip *)
+                  rm -fR $out/_pkg
+                  mkdir -p $out/nix-support
+                  echo "file binary-dist \"$(echo $out/*.zip)\"" \
+                      > $out/nix-support/hydra-build-products
+                '';
+              };
+            };
         }.${system} or {});
         # build all packages in hydra.
         hydraJobs = packages;
diff --git a/sha256map.nix b/sha256map.nix
index c6cbc22b77..cbcbeaddf2 100644
--- a/sha256map.nix
+++ b/sha256map.nix
@@ -1,5 +1,5 @@
 {
-  "git://github.com/simplex-chat/simplexmq.git"."229e2607d76f3d6baf0d2623b186c084e3908b8f" = "1w7mrrsyjh2wskqgdp8ml33xivzzqhzig217q3f92nkzc87ziq4g";
+  "git://github.com/simplex-chat/simplexmq.git"."137afb68fe02ac05c439c870db7c626fb6ef7880" = "12n5zxd2bpiidb4ps3hm4wwx22ynvcknsgfwq0868wg941rd238f";
   "git://github.com/simplex-chat/aeson.git"."3eb66f9a68f103b5f1489382aad89f5712a64db7" = "0kilkx59fl6c3qy3kjczqvm8c3f4n3p0bdk9biyflf51ljnzp4yp";
   "git://github.com/simplex-chat/haskell-terminal.git"."f708b00009b54890172068f168bf98508ffcd495" = "0zmq7lmfsk8m340g47g5963yba7i88n4afa6z93sg9px5jv1mijj";
   "git://github.com/zw3rk/android-support.git"."3c3a5ab0b8b137a072c98d3d0937cbdc96918ddb" = "1r6jyxbim3dsvrmakqfyxbd6ms6miaghpbwyl0sr6dzwpgaprz97";
diff --git a/stack.yaml b/stack.yaml
index 09a567a0bc..09cffe958c 100644
--- a/stack.yaml
+++ b/stack.yaml
@@ -48,7 +48,7 @@ extra-deps:
   # - simplexmq-1.0.0@sha256:34b2004728ae396e3ae449cd090ba7410781e2b3cefc59259915f4ca5daa9ea8,8561
   # - ../simplexmq
   - github: simplex-chat/simplexmq
-    commit: 229e2607d76f3d6baf0d2623b186c084e3908b8f
+    commit: 137afb68fe02ac05c439c870db7c626fb6ef7880
   # - terminal-0.2.0.0@sha256:de6770ecaae3197c66ac1f0db5a80cf5a5b1d3b64a66a05b50f442de5ad39570,2977
   - github: simplex-chat/aeson
     commit: 3eb66f9a68f103b5f1489382aad89f5712a64db7