diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5939aef281..cd6a58bca5 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -15,6 +15,7 @@ Changelog
 
 ### Fixes
 
+- Fixed Daedalus development environment issues on OSX Big Sur ([PR 2288](https://github.com/input-output-hk/daedalus/pull/2288))
 - Added initial loading state to UTXO screen ([PR 2265](https://github.com/input-output-hk/daedalus/pull/2265))
 
 ### Chores
diff --git a/installers/overlays/required.nix b/installers/overlays/required.nix
index 7fdc031cf9..d8f096a36f 100644
--- a/installers/overlays/required.nix
+++ b/installers/overlays/required.nix
@@ -8,5 +8,5 @@ self: super: {
   dhall = dontCheck (doJailbreak (self.callPackage ./dhall.nix {}));
   universum = dontCheck (self.callPackage ./universum.nix {});
   nsis = self.callPackage ./nsis.nix {};
-  github = self.callHackage "github" "0.23" {};
+  github = self.callHackage "github" "0.26" {};
 }
diff --git a/nix/sources.json b/nix/sources.json
index f048aa97bc..57406e5acc 100644
--- a/nix/sources.json
+++ b/nix/sources.json
@@ -61,15 +61,15 @@
         "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
     },
     "iohk-nix": {
-        "branch": "master",
+        "branch": "nixpkgs-bump",
         "description": "nix scripts shared across projects",
         "homepage": null,
         "owner": "input-output-hk",
         "repo": "iohk-nix",
-        "rev": "5b86d63a0b59b7666d19901b654d8fbde27d9500",
-        "sha256": "1mfb93nnw0x4gyq93v6lh6h7imliw4j0wp5l9gpdafy3rw621xzb",
+        "rev": "940f3b7c16b9e7d4493d400280eedf2c936aa5c0",
+        "sha256": "1m5c8abw3bi5ij99vbcb5bpjywljy72yig5bbm4158r1mck7hljd",
         "type": "tarball",
-        "url": "https://github.com/input-output-hk/iohk-nix/archive/5b86d63a0b59b7666d19901b654d8fbde27d9500.tar.gz",
+        "url": "https://github.com/input-output-hk/iohk-nix/archive/940f3b7c16b9e7d4493d400280eedf2c936aa5c0.tar.gz",
         "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
     },
     "js-chain-libs": {