diff --git a/nix/ci.nix b/nix/ci.nix
index 24569b2..b289475 100644
--- a/nix/ci.nix
+++ b/nix/ci.nix
@@ -1,7 +1,7 @@
 let
   sources = import ./sources.nix;
   lib = import (sources."nixpkgs" + "/lib");
-  inherit (import sources."project.nix" { inherit lib; }) dimension;
+  inherit (import (sources."project.nix" + "/lib/dimension.nix") { inherit lib; }) dimension;
 in
 
 dimension "Nixpkgs version" {
diff --git a/nix/sources.json b/nix/sources.json
index b21511a..adb5449 100644
--- a/nix/sources.json
+++ b/nix/sources.json
@@ -5,10 +5,10 @@
         "homepage": "https://github.com/nmattia/niv",
         "owner": "nmattia",
         "repo": "niv",
-        "rev": "1dd094156b249586b66c16200ecfd365c7428dc0",
-        "sha256": "1b2vjnn8iac5iiqszjc2v1s1ygh0yri998c0k3s4x4kn0dsqik21",
+        "rev": "98c74a80934123cb4c3bf3314567f67311eb711a",
+        "sha256": "1w8n54hapd4x9f1am33icvngkqns7m3hl9yair38yqq08ffwg0kn",
         "type": "tarball",
-        "url": "https://github.com/nmattia/niv/archive/1dd094156b249586b66c16200ecfd365c7428dc0.tar.gz",
+        "url": "https://github.com/nmattia/niv/archive/98c74a80934123cb4c3bf3314567f67311eb711a.tar.gz",
         "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
     },
     "nixos-19.03": {
@@ -29,22 +29,22 @@
         "homepage": "https://github.com/NixOS/nixpkgs",
         "owner": "NixOS",
         "repo": "nixpkgs-channels",
-        "rev": "ce9f1aaa39ee2a5b76a9c9580c859a74de65ead5",
-        "sha256": "1s2b9rvpyamiagvpl5cggdb2nmx4f7lpylipd397wz8f0wngygpi",
+        "rev": "bf7c0f0461e047bec108a5c5d5d1b144289a65ba",
+        "sha256": "01dsh9932x6xcba2p0xg4n563b85i3p7s2sakj7yf2ws8pgmwhq9",
         "type": "tarball",
-        "url": "https://github.com/NixOS/nixpkgs-channels/archive/ce9f1aaa39ee2a5b76a9c9580c859a74de65ead5.tar.gz",
+        "url": "https://github.com/NixOS/nixpkgs-channels/archive/bf7c0f0461e047bec108a5c5d5d1b144289a65ba.tar.gz",
         "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
     },
     "nixos-20.03": {
-        "branch": "nixos-20.03",
+        "branch": "release-20.03",
         "description": "A read-only mirror of NixOS/nixpkgs tracking the released channels. Send issues and PRs to",
         "homepage": "https://github.com/NixOS/nixpkgs",
         "owner": "NixOS",
-        "repo": "nixpkgs-channels",
-        "rev": "04aca9ac24ad24c2dbeb37e1cfa94d8453f07a51",
-        "sha256": "152k3aisxqd219yvcy6xr8frh0yrs9ycaw1ik04c2lp49d21b8nh",
+        "repo": "nixpkgs",
+        "rev": "d6e406ddaea2e690c2f9f1a283e44c3d1c588ba3",
+        "sha256": "1m8gyrp8cpmnmxv3g2pv1460nz10bb88zqzvj6wmnhqkjgwwj3hm",
         "type": "tarball",
-        "url": "https://github.com/NixOS/nixpkgs-channels/archive/04aca9ac24ad24c2dbeb37e1cfa94d8453f07a51.tar.gz",
+        "url": "https://github.com/NixOS/nixpkgs/archive/d6e406ddaea2e690c2f9f1a283e44c3d1c588ba3.tar.gz",
         "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
     },
     "nixos-unstable": {
@@ -53,10 +53,10 @@
         "homepage": "https://github.com/NixOS/nixpkgs",
         "owner": "NixOS",
         "repo": "nixpkgs-channels",
-        "rev": "42f0be81ae05a8fe6d6e8e7f1c28652e7746e046",
-        "sha256": "1rxb5kmghkzazqcv4d8yczdiv2srs4r7apx4idc276lcikm0hdmf",
+        "rev": "a2e06fc3423c4be53181b15c28dfbe0bcf67dd73",
+        "sha256": "0bjx4iq6nyhj47q5zkqsbfgng445xwprrslj1xrv56142jn8n5r9",
         "type": "tarball",
-        "url": "https://github.com/NixOS/nixpkgs-channels/archive/42f0be81ae05a8fe6d6e8e7f1c28652e7746e046.tar.gz",
+        "url": "https://github.com/NixOS/nixpkgs-channels/archive/a2e06fc3423c4be53181b15c28dfbe0bcf67dd73.tar.gz",
         "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz",
         "version": ""
     },
@@ -66,10 +66,10 @@
         "homepage": "https://github.com/NixOS/nixpkgs",
         "owner": "NixOS",
         "repo": "nixpkgs-channels",
-        "rev": "04aca9ac24ad24c2dbeb37e1cfa94d8453f07a51",
-        "sha256": "152k3aisxqd219yvcy6xr8frh0yrs9ycaw1ik04c2lp49d21b8nh",
+        "rev": "99a3d7a86fce9e9c9f23b3e304d7d2b1270a12b8",
+        "sha256": "0i40cl3n6600z2lkwrpiy28dcnv2r63fcgfswj91aaf1xfn2chql",
         "type": "tarball",
-        "url": "https://github.com/NixOS/nixpkgs-channels/archive/04aca9ac24ad24c2dbeb37e1cfa94d8453f07a51.tar.gz",
+        "url": "https://github.com/NixOS/nixpkgs-channels/archive/99a3d7a86fce9e9c9f23b3e304d7d2b1270a12b8.tar.gz",
         "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
     },
     "project.nix": {
@@ -78,10 +78,10 @@
         "homepage": null,
         "owner": "hercules-ci",
         "repo": "project.nix",
-        "rev": "33e5f3cb25feff4ccd00f8c60a05976e2ee01802",
-        "sha256": "0c3q3il5h6q3ms8m6da51knvjsfvpz12sh3a3av4d2a5ikm5ncl1",
+        "rev": "95f26b1cca0414f080172721ab7996ab65b8d968",
+        "sha256": "1fbpvidq3bdvinxdkk2vvvfjhxmbf45hgy2sgv2pbml4zrckbfdj",
         "type": "tarball",
-        "url": "https://github.com/hercules-ci/project.nix/archive/33e5f3cb25feff4ccd00f8c60a05976e2ee01802.tar.gz",
+        "url": "https://github.com/hercules-ci/project.nix/archive/95f26b1cca0414f080172721ab7996ab65b8d968.tar.gz",
         "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
     },
     "releaser": {
@@ -90,10 +90,10 @@
         "homepage": null,
         "owner": "domenkozar",
         "repo": "releaser",
-        "rev": "43a4e27654f388e8eacab631e24e26792ff88fe2",
-        "sha256": "072jlbw0hdc4nvs9frd7wdyzdv4mz2dc5ib35iaqi9rzdafq6822",
+        "rev": "0be40041273bd93891dd2be300d1f21f9e9a121b",
+        "sha256": "0ckgcliyi37hvpfp40nmk6r0q5irinkc2cpqs0l85z2a7si66hzh",
         "type": "tarball",
-        "url": "https://github.com/domenkozar/releaser/archive/43a4e27654f388e8eacab631e24e26792ff88fe2.tar.gz",
+        "url": "https://github.com/domenkozar/releaser/archive/0be40041273bd93891dd2be300d1f21f9e9a121b.tar.gz",
         "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
     }
 }