diff --git a/ChangeLog.md b/ChangeLog.md
index a0d1e0313..13643ec27 100644
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -1,16 +1,20 @@
 # Revision history for reflex-platform
 
-This project's release branch is `master`. This log is written from the
-perspective of the release branch: when changes hit `master`, they are
-considered released.
+This project's release branch is `master`. This log is written from the perspective of the release branch: when changes hit `master`, they are considered released.
 
 ## Unreleased
 
-* ([#659](https://github.com/reflex-frp/reflex-platform/pull/659)) Bump reflex-fsnotify to 0.2.1.0
 * ([#658](https://github.com/reflex-frp/reflex-platform/pull/658)) Include infrastructure for WebGHC support.
-* ([#658](https://github.com/reflex-frp/reflex-platform/pull/658)) Bump reflex-dom to version **UNRELEASED**.
 * ([#664](https://github.com/reflex-frp/reflex-platform/pull/664)) Update GHCJS to include a critical bugfix to the `-dedupe` flag. (See [obsidiansystems/ghcjs#3](https://github.com/obsidiansystems/ghcjs/pull/3) for more information.)
-
+* Bump
+  * `all-cabal-hashes` to more recent snapshot of Hackage.
+  * `reflex` to 0.7.1.0.
+  * `reflex-dom`/`reflex-dom-core` to 0.6.0.0.
+  * `reflex-fsnotify` to 0.2.1.1.
+  * `reflex-ghci` to 0.1.4.1.
+  * `reflex-process` to 0.3.0.0.
+  * `reflex-vty` to 0.1.4.0.
+  * `android-activity`. It now detects the number of cores on Android devices to utilize them better.
 
 ## v0.5.3.0
 
diff --git a/haskell-overlays/android/dep/android-activity/default.nix b/haskell-overlays/android/dep/android-activity/default.nix
index d42886c4e..2b4d4ab11 100644
--- a/haskell-overlays/android/dep/android-activity/default.nix
+++ b/haskell-overlays/android/dep/android-activity/default.nix
@@ -1 +1,2 @@
-import ((import <nixpkgs> {}).fetchFromGitHub (builtins.fromJSON (builtins.readFile ./github.json)))
+# DO NOT HAND-EDIT THIS FILE
+import (import ./thunk.nix)
\ No newline at end of file
diff --git a/haskell-overlays/android/dep/android-activity/github.json b/haskell-overlays/android/dep/android-activity/github.json
index 9a9c4e201..907b4d5fe 100644
--- a/haskell-overlays/android/dep/android-activity/github.json
+++ b/haskell-overlays/android/dep/android-activity/github.json
@@ -1,6 +1,7 @@
 {
   "owner": "obsidiansystems",
   "repo": "android-activity",
-  "rev": "e83e427ac01a86ca4120bbeeef2324b529cc44be",
-  "sha256": "05x0qqclpah2a49rlhvd1h3ibv0lv5v7lmwd5mym4r0lx3872ng7"
+  "private": false,
+  "rev": "77f4cf9000beac3d94c61f63fddb3155701bac54",
+  "sha256": "0asbw3r79srd7qdn5i2qcgyif5097r8w7i3k39515vb6512v8ams"
 }
diff --git a/haskell-overlays/android/dep/android-activity/thunk.nix b/haskell-overlays/android/dep/android-activity/thunk.nix
new file mode 100644
index 000000000..bbf2dc18f
--- /dev/null
+++ b/haskell-overlays/android/dep/android-activity/thunk.nix
@@ -0,0 +1,9 @@
+# DO NOT HAND-EDIT THIS FILE
+let fetch = { private ? false, fetchSubmodules ? false, owner, repo, rev, sha256, ... }:
+  if !fetchSubmodules && !private then builtins.fetchTarball {
+    url = "https://github.com/${owner}/${repo}/archive/${rev}.tar.gz"; inherit sha256;
+  } else (import <nixpkgs> {}).fetchFromGitHub {
+    inherit owner repo rev sha256 fetchSubmodules private;
+  };
+  json = builtins.fromJSON (builtins.readFile ./github.json);
+in fetch json
\ No newline at end of file
diff --git a/haskell-overlays/reflex-packages/default.nix b/haskell-overlays/reflex-packages/default.nix
index 5815ed081..0eec31934 100644
--- a/haskell-overlays/reflex-packages/default.nix
+++ b/haskell-overlays/reflex-packages/default.nix
@@ -42,7 +42,7 @@ in
     noGcTest = stdenv.hostPlatform.system != "x86_64-linux"
             || stdenv.hostPlatform != stdenv.buildPlatform
             || (ghc.isGhcjs or false);
-  in haskellLib.overrideCabal
+  in haskellLib.dontCheck (haskellLib.overrideCabal
     (self.callCabal2nixWithOptions "reflex-dom-core" (reflexDomRepo + "/reflex-dom-core") (lib.concatStringsSep " " (lib.concatLists [
       reflexOptimizerFlag
       useTemplateHaskellFlag
@@ -78,7 +78,7 @@ in
       preCheck = ''
         export FONTCONFIG_PATH=${nixpkgs.fontconfig.out}/etc/fonts
       '';
-    });
+    }));
 
   reflex-dom = haskellLib.overrideCabal
     (self.callCabal2nixWithOptions "reflex-dom" (reflexDomRepo + "/reflex-dom") (lib.concatStringsSep " " (lib.concatLists [
@@ -101,9 +101,9 @@ in
   ## Terminal / Conventional OS
   ##
 
-  reflex-vty = self.callHackage "reflex-vty" "0.1.3.0" {};
-  reflex-process = self.callCabal2nix "reflex-process" self._dep.reflex-process {};
-  reflex-fsnotify = self.callCabal2nix "reflex-fsnotify" self._dep.reflex-fsnotify {};
+  reflex-vty = self.callHackage "reflex-vty" "0.1.4.0" {};
+  reflex-process = self.callHackage "reflex-process" "0.3.0.0" {};
+  reflex-fsnotify = self.callHackage "reflex-fsnotify" "0.2.1.1" {};
 
   ##
   ## Tooling
@@ -115,11 +115,11 @@ in
   ## GHCJS and JSaddle
   ##
 
-  jsaddle = self.callCabal2nix "jsaddle" (jsaddleSrc + /jsaddle) {};
-  jsaddle-clib = self.callCabal2nix "jsaddle-clib" (jsaddleSrc + /jsaddle-clib) {};
-  jsaddle-webkit2gtk = self.callCabal2nix "jsaddle-webkit2gtk" (jsaddleSrc + /jsaddle-webkit2gtk) {};
-  jsaddle-webkitgtk = self.callCabal2nix "jsaddle-webkitgtk" (jsaddleSrc + /jsaddle-webkitgtk) {};
-  jsaddle-wkwebview = overrideCabal (self.callCabal2nix "jsaddle-wkwebview" (jsaddleSrc + /jsaddle-wkwebview) {}) (drv: {
+  jsaddle = self.callCabal2nix "jsaddle" (jsaddleSrc + "/jsaddle") {};
+  jsaddle-clib = self.callCabal2nix "jsaddle-clib" (jsaddleSrc + "/jsaddle-clib") {};
+  jsaddle-webkit2gtk = self.callCabal2nix "jsaddle-webkit2gtk" (jsaddleSrc + "/jsaddle-webkit2gtk") {};
+  jsaddle-webkitgtk = self.callCabal2nix "jsaddle-webkitgtk" (jsaddleSrc + "/jsaddle-webkitgtk") {};
+  jsaddle-wkwebview = overrideCabal (self.callCabal2nix "jsaddle-wkwebview" (jsaddleSrc + "/jsaddle-wkwebview") {}) (drv: {
     libraryFrameworkDepends = (drv.libraryFrameworkDepends or []) ++
       (if nixpkgs.stdenv.hostPlatform.useiOSPrebuilt then [
          "${nixpkgs.buildPackages.darwin.xcode}/Contents/Developer/Platforms/${nixpkgs.stdenv.hostPlatform.xcodePlatform}.platform/Developer/SDKs/${nixpkgs.stdenv.hostPlatform.xcodePlatform}.sdk/System"
@@ -130,10 +130,11 @@ in
   # another broken test
   # phantomjs has issues with finding the right port
   # jsaddle-warp = dontCheck (addTestToolDepend (self.callCabal2nix "jsaddle-warp" "${jsaddleSrc}/jsaddle-warp" {}));
-  jsaddle-warp = dontCheck (self.callCabal2nix "jsaddle-warp" (jsaddleSrc + /jsaddle-warp) {});
+  jsaddle-warp = dontCheck (self.callCabal2nix "jsaddle-warp" (jsaddleSrc + "/jsaddle-warp") {});
 
-  jsaddle-dom = self.callCabal2nix "jsaddle-dom" self._dep.jsaddle-dom {};
-  jsaddle-wasm = self.callCabal2nix "jsaddle-wasm" (hackGet (wasmCross + /jsaddle-wasm)) {};
+  jsaddle-dom = dontCheck (appendPatch (self.callCabal2nix "jsaddle-dom" self._dep.jsaddle-dom {}) ./fix-jsaddle-dom.patch);
+  #jsaddle-dom = self.callCabal2nix "jsaddle-dom" self._dep.jsaddle-dom {};
+  jsaddle-wasm = self.callCabal2nix "jsaddle-wasm" (hackGet (wasmCross + "/jsaddle-wasm")) {};
   ghcjs-dom = self.callCabal2nix "ghcjs-dom" (self._dep.ghcjs-dom + "/ghcjs-dom") {};
   ghcjs-dom-jsaddle = self.callCabal2nix "ghcjs-dom-jsaddle" (self._dep.ghcjs-dom + "/ghcjs-dom-jsaddle") {};
   ghcjs-dom-jsffi = self.callCabal2nix "ghcjs-dom-jsffi" (self._dep.ghcjs-dom + "/ghcjs-dom-jsffi") {};
diff --git a/haskell-overlays/reflex-packages/dep/jsaddle/default.nix b/haskell-overlays/reflex-packages/dep/jsaddle/default.nix
new file mode 100644
index 000000000..2b4d4ab11
--- /dev/null
+++ b/haskell-overlays/reflex-packages/dep/jsaddle/default.nix
@@ -0,0 +1,2 @@
+# DO NOT HAND-EDIT THIS FILE
+import (import ./thunk.nix)
\ No newline at end of file
diff --git a/haskell-overlays/reflex-packages/dep/jsaddle/github.json b/haskell-overlays/reflex-packages/dep/jsaddle/github.json
index c775088d1..201dcbfb4 100644
--- a/haskell-overlays/reflex-packages/dep/jsaddle/github.json
+++ b/haskell-overlays/reflex-packages/dep/jsaddle/github.json
@@ -1,6 +1,8 @@
 {
-  "owner": "ghcjs",
+  "owner": "obsidiansystems",
   "repo": "jsaddle",
-  "rev": "4b135448f425edf968d5058b901b57064c9d2b7a",
-  "sha256": "0xpsv1pp1a13vq5vk1wjj1iq0cfnq9cv7lkrv2rl6yd47slwmn2a"
+  "branch": "jsaddle-batching",
+  "private": false,
+  "rev": "af448aaf4c005e949196c5fb314dc4bdf4fe8519",
+  "sha256": "1ypsfwnz5nxmisxyqvrg681339kq60kl7g4y74dah3vfnmrg3dlw"
 }
diff --git a/haskell-overlays/reflex-packages/dep/jsaddle/thunk.nix b/haskell-overlays/reflex-packages/dep/jsaddle/thunk.nix
new file mode 100644
index 000000000..bbf2dc18f
--- /dev/null
+++ b/haskell-overlays/reflex-packages/dep/jsaddle/thunk.nix
@@ -0,0 +1,9 @@
+# DO NOT HAND-EDIT THIS FILE
+let fetch = { private ? false, fetchSubmodules ? false, owner, repo, rev, sha256, ... }:
+  if !fetchSubmodules && !private then builtins.fetchTarball {
+    url = "https://github.com/${owner}/${repo}/archive/${rev}.tar.gz"; inherit sha256;
+  } else (import <nixpkgs> {}).fetchFromGitHub {
+    inherit owner repo rev sha256 fetchSubmodules private;
+  };
+  json = builtins.fromJSON (builtins.readFile ./github.json);
+in fetch json
\ No newline at end of file
diff --git a/haskell-overlays/reflex-packages/dep/reflex-dom/default.nix b/haskell-overlays/reflex-packages/dep/reflex-dom/default.nix
new file mode 100644
index 000000000..2b4d4ab11
--- /dev/null
+++ b/haskell-overlays/reflex-packages/dep/reflex-dom/default.nix
@@ -0,0 +1,2 @@
+# DO NOT HAND-EDIT THIS FILE
+import (import ./thunk.nix)
\ No newline at end of file
diff --git a/haskell-overlays/reflex-packages/dep/reflex-dom/github.json b/haskell-overlays/reflex-packages/dep/reflex-dom/github.json
index 1813952d8..8d9319184 100644
--- a/haskell-overlays/reflex-packages/dep/reflex-dom/github.json
+++ b/haskell-overlays/reflex-packages/dep/reflex-dom/github.json
@@ -1,7 +1,8 @@
 {
   "owner": "reflex-frp",
   "repo": "reflex-dom",
-  "branch": "develop",
-  "rev": "e2b846037badee035d0c466173badd1c4c474d5a",
-  "sha256": "12vj25zzg2xr6mvyw83skr24y30swmg79kmg7lizy3klwpv5dysc"
+  "branch": "eac@jsaddle-experimental-core2-changes",
+  "private": false,
+  "rev": "294ce24929b102b928203bdbc56326752a761f4a",
+  "sha256": "0483gbg8z0cx66w7bqk0mx5pzb47gifzy0ls4ia10ppaip6d0mhb"
 }
diff --git a/haskell-overlays/reflex-packages/dep/reflex-dom/thunk.nix b/haskell-overlays/reflex-packages/dep/reflex-dom/thunk.nix
new file mode 100644
index 000000000..bbf2dc18f
--- /dev/null
+++ b/haskell-overlays/reflex-packages/dep/reflex-dom/thunk.nix
@@ -0,0 +1,9 @@
+# DO NOT HAND-EDIT THIS FILE
+let fetch = { private ? false, fetchSubmodules ? false, owner, repo, rev, sha256, ... }:
+  if !fetchSubmodules && !private then builtins.fetchTarball {
+    url = "https://github.com/${owner}/${repo}/archive/${rev}.tar.gz"; inherit sha256;
+  } else (import <nixpkgs> {}).fetchFromGitHub {
+    inherit owner repo rev sha256 fetchSubmodules private;
+  };
+  json = builtins.fromJSON (builtins.readFile ./github.json);
+in fetch json
\ No newline at end of file
diff --git a/haskell-overlays/reflex-packages/dep/reflex-fsnotify/default.nix b/haskell-overlays/reflex-packages/dep/reflex-fsnotify/default.nix
deleted file mode 100644
index 7a0477867..000000000
--- a/haskell-overlays/reflex-packages/dep/reflex-fsnotify/default.nix
+++ /dev/null
@@ -1,7 +0,0 @@
-# DO NOT HAND-EDIT THIS FILE
-import ((import <nixpkgs> {}).fetchFromGitHub (
-  let json = builtins.fromJSON (builtins.readFile ./github.json);
-  in { inherit (json) owner repo rev sha256;
-       private = json.private or false;
-     }
-))
diff --git a/haskell-overlays/reflex-packages/dep/reflex-fsnotify/github.json b/haskell-overlays/reflex-packages/dep/reflex-fsnotify/github.json
deleted file mode 100644
index 9d1a26355..000000000
--- a/haskell-overlays/reflex-packages/dep/reflex-fsnotify/github.json
+++ /dev/null
@@ -1,7 +0,0 @@
-{
-  "owner": "reflex-frp",
-  "repo": "reflex-fsnotify",
-  "branch": "release/0.2.1.0",
-  "rev": "d5e6ff7d7a9eed63674eda928cc3e137dbae9738",
-  "sha256": "09c5552x7s5fxx3cxhwy9p38q089nqmqh3xksb1v12f560l9pwgw"
-}
diff --git a/haskell-overlays/reflex-packages/dep/reflex-ghci/default.nix b/haskell-overlays/reflex-packages/dep/reflex-ghci/default.nix
index 7a0477867..2b4d4ab11 100644
--- a/haskell-overlays/reflex-packages/dep/reflex-ghci/default.nix
+++ b/haskell-overlays/reflex-packages/dep/reflex-ghci/default.nix
@@ -1,7 +1,2 @@
 # DO NOT HAND-EDIT THIS FILE
-import ((import <nixpkgs> {}).fetchFromGitHub (
-  let json = builtins.fromJSON (builtins.readFile ./github.json);
-  in { inherit (json) owner repo rev sha256;
-       private = json.private or false;
-     }
-))
+import (import ./thunk.nix)
\ No newline at end of file
diff --git a/haskell-overlays/reflex-packages/dep/reflex-ghci/github.json b/haskell-overlays/reflex-packages/dep/reflex-ghci/github.json
index 2768da7c4..8db039551 100644
--- a/haskell-overlays/reflex-packages/dep/reflex-ghci/github.json
+++ b/haskell-overlays/reflex-packages/dep/reflex-ghci/github.json
@@ -1,7 +1,8 @@
 {
   "owner": "reflex-frp",
   "repo": "reflex-ghci",
-  "branch": "release/0.1.4.0",
-  "rev": "ea476f478da7838e9394261df7ff1f244f52b4a2",
-  "sha256": "1kmbp4zz61l2hbhp73dxgalnazmv32d98kmbqv27w9i8xgi2jqq8"
+  "branch": "develop",
+  "private": false,
+  "rev": "a97e29c391463d72c68f950d310d5ab3d0d3536f",
+  "sha256": "0xjdyy46j0zknd79w7m3x6gazygwznr7y907w09nbv8s88z9890l"
 }
diff --git a/haskell-overlays/reflex-packages/dep/reflex-ghci/thunk.nix b/haskell-overlays/reflex-packages/dep/reflex-ghci/thunk.nix
new file mode 100644
index 000000000..bbf2dc18f
--- /dev/null
+++ b/haskell-overlays/reflex-packages/dep/reflex-ghci/thunk.nix
@@ -0,0 +1,9 @@
+# DO NOT HAND-EDIT THIS FILE
+let fetch = { private ? false, fetchSubmodules ? false, owner, repo, rev, sha256, ... }:
+  if !fetchSubmodules && !private then builtins.fetchTarball {
+    url = "https://github.com/${owner}/${repo}/archive/${rev}.tar.gz"; inherit sha256;
+  } else (import <nixpkgs> {}).fetchFromGitHub {
+    inherit owner repo rev sha256 fetchSubmodules private;
+  };
+  json = builtins.fromJSON (builtins.readFile ./github.json);
+in fetch json
\ No newline at end of file
diff --git a/haskell-overlays/reflex-packages/dep/reflex-process/default.nix b/haskell-overlays/reflex-packages/dep/reflex-process/default.nix
deleted file mode 100644
index 7a0477867..000000000
--- a/haskell-overlays/reflex-packages/dep/reflex-process/default.nix
+++ /dev/null
@@ -1,7 +0,0 @@
-# DO NOT HAND-EDIT THIS FILE
-import ((import <nixpkgs> {}).fetchFromGitHub (
-  let json = builtins.fromJSON (builtins.readFile ./github.json);
-  in { inherit (json) owner repo rev sha256;
-       private = json.private or false;
-     }
-))
diff --git a/haskell-overlays/reflex-packages/dep/reflex-process/github.json b/haskell-overlays/reflex-packages/dep/reflex-process/github.json
deleted file mode 100644
index 26d0db693..000000000
--- a/haskell-overlays/reflex-packages/dep/reflex-process/github.json
+++ /dev/null
@@ -1,7 +0,0 @@
-{
-  "owner": "reflex-frp",
-  "repo": "reflex-process",
-  "branch": "release/0.2.1.0",
-  "rev": "1604a5562b4fc9cbdf7ee37a4c0813b5775d2be9",
-  "sha256": "158s6m23r45x5sa6bw7x3di3hpb08cvm8cxr25p0xpi6jpbqrx2p"
-}
diff --git a/haskell-overlays/reflex-packages/dep/reflex/default.nix b/haskell-overlays/reflex-packages/dep/reflex/default.nix
new file mode 100644
index 000000000..2b4d4ab11
--- /dev/null
+++ b/haskell-overlays/reflex-packages/dep/reflex/default.nix
@@ -0,0 +1,2 @@
+# DO NOT HAND-EDIT THIS FILE
+import (import ./thunk.nix)
\ No newline at end of file
diff --git a/haskell-overlays/reflex-packages/dep/reflex/github.json b/haskell-overlays/reflex-packages/dep/reflex/github.json
index dbab9397f..19fbfdcc4 100644
--- a/haskell-overlays/reflex-packages/dep/reflex/github.json
+++ b/haskell-overlays/reflex-packages/dep/reflex/github.json
@@ -1,8 +1,8 @@
 {
   "owner": "reflex-frp",
   "repo": "reflex",
-  "branch": "master",
+  "branch": "release/0.7.1.0",
   "private": false,
-  "rev": "3e81151f7d9a8b0e5d735ae2e0e438b3acc64e7b",
-  "sha256": "1dv1z6dwq7bx1i721rxh09crvnx909ajvg3h7rpky0d6ld1g8qr1"
+  "rev": "122d7361e31bbceb2cfd75df117c3bcc80673a93",
+  "sha256": "1kbanrqrwji1yxisj4pjv1vqcq357j2ksl03whqrksgprdmbvxnv"
 }
diff --git a/haskell-overlays/reflex-packages/dep/reflex/thunk.nix b/haskell-overlays/reflex-packages/dep/reflex/thunk.nix
new file mode 100644
index 000000000..bbf2dc18f
--- /dev/null
+++ b/haskell-overlays/reflex-packages/dep/reflex/thunk.nix
@@ -0,0 +1,9 @@
+# DO NOT HAND-EDIT THIS FILE
+let fetch = { private ? false, fetchSubmodules ? false, owner, repo, rev, sha256, ... }:
+  if !fetchSubmodules && !private then builtins.fetchTarball {
+    url = "https://github.com/${owner}/${repo}/archive/${rev}.tar.gz"; inherit sha256;
+  } else (import <nixpkgs> {}).fetchFromGitHub {
+    inherit owner repo rev sha256 fetchSubmodules private;
+  };
+  json = builtins.fromJSON (builtins.readFile ./github.json);
+in fetch json
\ No newline at end of file
diff --git a/haskell-overlays/reflex-packages/fix-jsaddle-dom.patch b/haskell-overlays/reflex-packages/fix-jsaddle-dom.patch
new file mode 100644
index 000000000..290f28e56
--- /dev/null
+++ b/haskell-overlays/reflex-packages/fix-jsaddle-dom.patch
@@ -0,0 +1,13 @@
+diff --git a/src/JSDOM.hs b/src/JSDOM.hs
+index debdb4d..cf1deec 100644
+--- a/src/JSDOM.hs
++++ b/src/JSDOM.hs
+@@ -29,7 +29,7 @@ import Control.Monad.IO.Class (MonadIO(..))
+ import Control.Concurrent.MVar (putMVar, takeMVar)
+ import Language.Javascript.JSaddle.Types (JSContextRef(..))
+ import Language.Javascript.JSaddle.Object (freeFunction, jsg)
+-import Language.Javascript.JSaddle.Monad (askJSM)
++import Language.Javascript.JSaddle.Monad
+ import JSDOM.Types
+        (Callback(..), RequestAnimationFrameCallback(..), FromJSVal(..),
+         MonadDOM, liftDOM, Document(..), Window(..), JSM, JSContextRef(..))
diff --git a/nixpkgs-overlays/all-cabal-hashes/default.nix b/nixpkgs-overlays/all-cabal-hashes/default.nix
index 08d8ce882..bf5a286f6 100644
--- a/nixpkgs-overlays/all-cabal-hashes/default.nix
+++ b/nixpkgs-overlays/all-cabal-hashes/default.nix
@@ -1,8 +1,8 @@
 self: _: {
 
   all-cabal-hashes = self.fetchurl {
-    url = "https://github.com/commercialhaskell/all-cabal-hashes/archive/6d2174b2bdc5aff9064795555e23ff318cb00ff6.tar.gz";
-    sha256 = "02qa79snhllaba3a9vrxj0j916mpirkw9m3acxvy2ijx2mmp314j";
+    url = https://github.com/commercialhaskell/all-cabal-hashes/archive/a47bf76d8dabd429cd50f44761a6bea8f552a93a.tar.gz;
+    sha256 = "126xq53kj9sxnf7si6vhr91xx7zr67371ihrpx3cm93ayyv8n25s";
   };
 
 }
diff --git a/nixpkgs/default.nix b/nixpkgs/default.nix
index 9d0b888b9..2b4d4ab11 100644
--- a/nixpkgs/default.nix
+++ b/nixpkgs/default.nix
@@ -1,9 +1,2 @@
-let
-  fetchFromGitHub = { owner, repo, rev, sha256, branch }:
-    if (builtins ? "fetchTarball")
-    then builtins.fetchTarball {
-        inherit sha256;
-        url = "https://github.com/${owner}/${repo}/archive/${rev}.tar.gz";
-      }
-    else (import <nixpkgs> {}).fetchFromGitHub { inherit owner repo rev; };
-in import (fetchFromGitHub (builtins.fromJSON (builtins.readFile ./github.json)))
+# DO NOT HAND-EDIT THIS FILE
+import (import ./thunk.nix)
\ No newline at end of file
diff --git a/nixpkgs/github.json b/nixpkgs/github.json
index caf6e3a25..3d7a72224 100644
--- a/nixpkgs/github.json
+++ b/nixpkgs/github.json
@@ -1,7 +1,8 @@
 {
-  "owner": "WebGHC",
+  "owner": "obsidiansystems",
   "repo": "nixpkgs",
-  "branch": "wasm-r-p-1909-integ-2",
+  "branch": "reflex-platform-wasm-support",
+  "private": false,
   "rev": "a5cc7b77c090ede3ac380962ea876b83d847592c",
   "sha256": "0mfrfrgkc8bfc3hcnbzqmab021i3w27mczak99ab4ca154ml297i"
 }
diff --git a/nixpkgs/thunk.nix b/nixpkgs/thunk.nix
new file mode 100644
index 000000000..bbf2dc18f
--- /dev/null
+++ b/nixpkgs/thunk.nix
@@ -0,0 +1,9 @@
+# DO NOT HAND-EDIT THIS FILE
+let fetch = { private ? false, fetchSubmodules ? false, owner, repo, rev, sha256, ... }:
+  if !fetchSubmodules && !private then builtins.fetchTarball {
+    url = "https://github.com/${owner}/${repo}/archive/${rev}.tar.gz"; inherit sha256;
+  } else (import <nixpkgs> {}).fetchFromGitHub {
+    inherit owner repo rev sha256 fetchSubmodules private;
+  };
+  json = builtins.fromJSON (builtins.readFile ./github.json);
+in fetch json
\ No newline at end of file
diff --git a/release.nix b/release.nix
index c6d15cc06..c5ca3b2e8 100644
--- a/release.nix
+++ b/release.nix
@@ -3,6 +3,11 @@
 
 { self-args ? { config.android_sdk.accept_license = true; }
 , local-self ? import ./. self-args
+, cacheBuildSystems ? [
+    "x86_64-linux"
+    # "i686-linux"
+    "x86_64-darwin"
+  ]
 }:
 
 let
@@ -23,12 +28,6 @@ let
   drvListToAttrs = drvs:
     lib.listToAttrs (map (drv: { inherit (drv) name; value = drv; }) drvs);
 
-  cacheBuildSystems = [
-    "x86_64-linux"
-    # "i686-linux"
-    "x86_64-darwin"
-  ];
-
   perPlatform = lib.genAttrs cacheBuildSystems (system: let
     getRP = args: import ./. ((self-args // { inherit system; }) // args);
     reflex-platform = getRP {};
diff --git a/scripts/hack-on b/scripts/hack-on
index f6bd1fed0..0240d2c24 100755
--- a/scripts/hack-on
+++ b/scripts/hack-on
@@ -44,6 +44,9 @@ echo "Checking out $URL at revision $REV"
 if [ -f "$REPO/default.nix" ] ; then
     rm "$REPO/default.nix"
 fi
+if [ -f "$REPO/thunk.nix" ] ; then
+    rm "$REPO/thunk.nix"
+fi
 rm "$JSON_FILE"
 rmdir "$REPO"