diff --git a/nix/sources.json b/nix/sources.json
index 9a0b696..8dfebba 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": "6f6529db3a69cf3c4dd81eebcb5b46f1d34170e5",
+        "sha256": "1qbyprn08917cszfm5syppi4r5p467qii4fzb2v1s0lrqqn0das4",
         "type": "tarball",
-        "url": "https://github.com/nmattia/niv/archive/82e5cd1ad3c387863f0545d7591512e76ab0fc41.tar.gz",
+        "url": "https://github.com/nmattia/niv/archive/6f6529db3a69cf3c4dd81eebcb5b46f1d34170e5.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": "58a1abdbae3217ca6b702f03d3b35125d88a2994",
+        "sha256": "05rpyikxpjf15nrzggrx4m0kjkjcmpyhm714nfrbhsp5cp1x1m4r",
         "type": "tarball",
-        "url": "https://github.com/NixOS/nixpkgs/archive/c777cdf5c564015d5f63b09cc93bef4178b19b01.tar.gz",
+        "url": "https://github.com/NixOS/nixpkgs/archive/58a1abdbae3217ca6b702f03d3b35125d88a2994.tar.gz",
         "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
     }
 }