diff --git a/nix/sources.json b/nix/sources.json
index 26a4c38..87261be 100644
--- a/nix/sources.json
+++ b/nix/sources.json
@@ -1,14 +1,14 @@
 {
     "cardano-node": {
-        "branch": "ff-environment",
+        "branch": "pioneer-3",
         "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": "bf8ab6e8e4468a8c3f6f4ea04f69314c057d6fb5",
-        "sha256": "0jk34cqbm6caxhw987gif4fxm4j3szzd1rhmxzbln90a97w7ypr4",
+        "rev": "522b4f4fb3bf1abcab28c905b70ff751cd71bde2",
+        "sha256": "10ppxdyll0vd0k4jb223md94594r9l03sqgjd59jh791rzvhwfrv",
         "type": "tarball",
-        "url": "https://github.com/input-output-hk/cardano-node/archive/bf8ab6e8e4468a8c3f6f4ea04f69314c057d6fb5.tar.gz",
+        "url": "https://github.com/input-output-hk/cardano-node/archive/522b4f4fb3bf1abcab28c905b70ff751cd71bde2.tar.gz",
         "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
     },
     "niv": {