diff --git a/nix/sources.json b/nix/sources.json
index eacf667..dc32071 100644
--- a/nix/sources.json
+++ b/nix/sources.json
@@ -26,16 +26,16 @@
         "rev": "aa0b717af7e1325d178537d16fa4b50d3f21edae",
         "sha256": "0ni10mv38qjyyrygs66ja3ayhn61rhbxxvvfr3rmkkn5mvpzyp92",
         "type": "tarball",
-        "url": "https://github.com/mattermost/mattermost-server/archive/refs/tags/v6.1.0.tar.gz",
+        "url": "https://github.com/mattermost/mattermost-server/archive/refs/tags/v6.2.1.tar.gz",
         "url_template": "https://github.com/<owner>/<repo>/archive/refs/tags/v<version>.tar.gz",
-        "version": "6.1.0"
+        "version": "6.2.1"
     },
     "mattermost-webapp": {
-        "sha256": "1g47qgy9fg4jzgywpsbzkvjk24llgxyfqlzf1ghsaqgcwjvnm594",
+        "sha256": "1x0628sglcggfgvgjv4sqw6f7avykrscydqvikg6j3l9r1q55fnq",
         "type": "tarball",
-        "url": "https://releases.mattermost.com/6.1.0/mattermost-6.1.0-linux-amd64.tar.gz",
+        "url": "https://releases.mattermost.com/6.2.1/mattermost-6.2.1-linux-amd64.tar.gz",
         "url_template": "https://releases.mattermost.com/<version>/mattermost-<version>-linux-amd64.tar.gz",
-        "version": "6.1.0"
+        "version": "6.2.1"
     },
     "mumble-website": {
         "branch": "master",
@@ -81,10 +81,10 @@
         "homepage": "",
         "owner": "nixos",
         "repo": "nixpkgs",
-        "rev": "7bca80140fc7732c7357b26002db3d87b3ba4c61",
-        "sha256": "0vyjpf1jw4cvw7kfbk055faq08q4swz6v1h2mf9zw4r8frhqa73w",
+        "rev": "8a053bc2255659c5ca52706b9e12e76a8f50dbdd",
+        "sha256": "087lqvl8icvwzk61a0sn87m48a7bmm1bhna3v61w12ad97an9shj",
         "type": "tarball",
-        "url": "https://github.com/nixos/nixpkgs/archive/7bca80140fc7732c7357b26002db3d87b3ba4c61.tar.gz",
+        "url": "https://github.com/nixos/nixpkgs/archive/8a053bc2255659c5ca52706b9e12e76a8f50dbdd.tar.gz",
         "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
     },
     "nixpkgs-unstable": {