diff --git a/nix/sources.json b/nix/sources.json
index 2d9368c..8b62c02 100644
--- a/nix/sources.json
+++ b/nix/sources.json
@@ -12,15 +12,15 @@
         "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
     },
     "daedalus": {
-        "branch": "release/4.2.0",
+        "branch": "release/4.2.1",
         "description": "The open source cryptocurrency wallet for ada, built to grow with the community",
         "homepage": "https://daedaluswallet.io/",
         "owner": "input-output-hk",
         "repo": "daedalus",
-        "rev": "4d7a67bb15f02192eb72e84ecf3dec698b3162aa",
-        "sha256": "0izggsq5whf3qbdd89lw5h9q1y56616xcwakakzjn9vl44ghmrqq",
+        "rev": "48fe616bacc61f831aca94659b89879df8d511f4",
+        "sha256": "107lmir14fhjn49swq1zxhji6fw4i4m7ipkhnq8s6f5blyf1n8gn",
         "type": "tarball",
-        "url": "https://github.com/input-output-hk/daedalus/archive/4d7a67bb15f02192eb72e84ecf3dec698b3162aa.tar.gz",
+        "url": "https://github.com/input-output-hk/daedalus/archive/48fe616bacc61f831aca94659b89879df8d511f4.tar.gz",
         "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
     },
     "iohk-nix": {