diff --git a/nix/sources.json b/nix/sources.json
index 19a7282..93a2858 100644
--- a/nix/sources.json
+++ b/nix/sources.json
@@ -1,14 +1,14 @@
 {
     "cardano-node": {
-        "branch": "refs/tags/1.21.1",
+        "branch": "refs/tags/1.21.2",
         "description": "The core component that is used to participate in a Cardano decentralised blockchain.",
         "homepage": "https://cardano.org",
         "owner": "input-output-hk",
         "repo": "cardano-node",
-        "rev": "a819311473563cb2ab3cd91543cf0f63facdf43e",
-        "sha256": "1zj780z3j11rwbvazg79ja5110cgvskzdls81ms0dv3qy7lw4iyr",
+        "rev": "9577e0a514454fd59faeba79a1bb6d670eddb96d",
+        "sha256": "0iby57rgwvhshnxlv3skrfaml5fgqmxhamjk70s69sifn6pih6sy",
         "type": "tarball",
-        "url": "https://github.com/input-output-hk/cardano-node/archive/a819311473563cb2ab3cd91543cf0f63facdf43e.tar.gz",
+        "url": "https://github.com/input-output-hk/cardano-node/archive/9577e0a514454fd59faeba79a1bb6d670eddb96d.tar.gz",
         "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
     },
     "daedalus": {