diff --git a/nix/sources.json b/nix/sources.json
index 9a0b696..50e92bc 100644
--- a/nix/sources.json
+++ b/nix/sources.json
@@ -5,10 +5,10 @@
         "homepage": "https://github.com/nmattia/niv",
         "owner": "nmattia",
         "repo": "niv",
-        "rev": "82e5cd1ad3c387863f0545d7591512e76ab0fc41",
-        "sha256": "090l219mzc0gi33i3psgph6s2pwsc8qy4lyrqjdj4qzkvmaj65a7",
+        "rev": "04c1cec14801d2b18fc1a771cf40cec249cb8670",
+        "sha256": "1xl4mni4az9wiwq3ygk0f53gwkjw5pnfgrl69r5vwji2jqc96a11",
         "type": "tarball",
-        "url": "https://github.com/nmattia/niv/archive/82e5cd1ad3c387863f0545d7591512e76ab0fc41.tar.gz",
+        "url": "https://github.com/nmattia/niv/archive/04c1cec14801d2b18fc1a771cf40cec249cb8670.tar.gz",
         "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
     },
     "nix-medley": {
@@ -29,10 +29,10 @@
         "homepage": "",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "c777cdf5c564015d5f63b09cc93bef4178b19b01",
-        "sha256": "0r2xhflcy5agaz4a3b8pxiyiwh32s1kl3swv73flnj1x3v69s8bm",
+        "rev": "2057814051972fa1453ddfb0d98badbea9b83c06",
+        "sha256": "1a8jafyawg8mysv787q0cwghkza9kahbbniism7v2rcxas89b575",
         "type": "tarball",
-        "url": "https://github.com/NixOS/nixpkgs/archive/c777cdf5c564015d5f63b09cc93bef4178b19b01.tar.gz",
+        "url": "https://github.com/NixOS/nixpkgs/archive/2057814051972fa1453ddfb0d98badbea9b83c06.tar.gz",
         "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
     }
 }