diff --git a/nix/sources.json b/nix/sources.json
index 88d9709c..ebd3fb8d 100644
--- a/nix/sources.json
+++ b/nix/sources.json
@@ -48,7 +48,7 @@
         "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
     },
     "nixpkgs": {
-        "branch": "nixos-20.03",
+        "branch": "nixos-20.09",
         "description": "Nixpkgs/NixOS branches that track the Nixpkgs/NixOS channels",
         "homepage": null,
         "owner": "NixOS",
@@ -72,7 +72,7 @@
         "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
     },
     "nixpkgs-release": {
-        "branch": "release-20.03",
+        "branch": "release-20.09",
         "description": "Nixpkgs/NixOS branches that track the Nixpkgs/NixOS channels",
         "homepage": null,
         "owner": "NixOS",