diff --git a/channels.nix b/channels.nix
index 9a29e8bd..876ef936 100644
--- a/channels.nix
+++ b/channels.nix
@@ -1,4 +1,8 @@
 let
+  nixos-21-05 = {
+    nixpkgs-channel = "nixos-21.05";
+    home-manager-channel = "home-manager-21.05";
+  };
   nixos-20-09 = {
     nixpkgs-channel = "nixos-20.09";
     home-manager-channel = "home-manager-20.09";
@@ -10,6 +14,6 @@ let
 in
 rec {
   hera = nixos-20-09;
-  apollo = nixos-20-09;
+  apollo = nixos-21-05;
   chor-cloud = hera;
 }
diff --git a/nix/sources.json b/nix/sources.json
index 35190469..d61ce370 100644
--- a/nix/sources.json
+++ b/nix/sources.json
@@ -11,6 +11,18 @@
         "url": "https://github.com/nix-community/home-manager/archive/49706878e1580d796cc99b63574310405935113f.tar.gz",
         "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
     },
+    "home-manager-21.05": {
+        "branch": "release-21.05",
+        "description": "Manage a user environment using Nix",
+        "homepage": "",
+        "owner": "nix-community",
+        "repo": "home-manager",
+        "rev": "ab64dc32493996c24607eab2cae6663466ddfb8a",
+        "sha256": "1w7qxjibrjlqi7l293pnxxww1wxsq46wf3xbcpibys6g165s05f4",
+        "type": "tarball",
+        "url": "https://github.com/nix-community/home-manager/archive/ab64dc32493996c24607eab2cae6663466ddfb8a.tar.gz",
+        "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
+    },
     "home-manager-master": {
         "branch": "master",
         "description": "Manage a user environment using Nix",
@@ -56,6 +68,18 @@
         "url": "https://github.com/NixOS/nixpkgs/archive/38fce8ec004b3e61c241e3b64c683f719644f350.tar.gz",
         "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
     },
+    "nixos-21.05": {
+        "branch": "nixos-21.05",
+        "description": "Nixpkgs/NixOS branches that track the Nixpkgs/NixOS channels",
+        "homepage": null,
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "d25ea6a0d2a847fb52131da546f2a866656fbafa",
+        "sha256": "0y2h71pvzrhc2svib4lwjl04hrzy8901ravvlyxlqdbal8hy3838",
+        "type": "tarball",
+        "url": "https://github.com/NixOS/nixpkgs/archive/d25ea6a0d2a847fb52131da546f2a866656fbafa.tar.gz",
+        "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
+    },
     "nixos-hardware": {
         "branch": "master",
         "description": "A collection of NixOS modules covering hardware quirks.",