diff --git a/README.md b/README.md
--- a/README.md
+++ b/README.md
@@ -199,7 +199,7 @@
 ```
 niv - dependency manager for Nix projects
 
-version: 0.2.10
+version: 0.2.11
 
 Usage: niv [-s|--sources-file FILE] COMMAND
 
diff --git a/niv.cabal b/niv.cabal
--- a/niv.cabal
+++ b/niv.cabal
@@ -4,10 +4,10 @@
 --
 -- see: https://github.com/sol/hpack
 --
--- hash: 1b9b474d46ac94696acfc5748eb406ba8113e1a46a662d0ad624b7c80f88572e
+-- hash: eef9107fe1bba6e167622d8a09a0918171aeaa083a2a74d2f4ffb5e921472169
 
 name:           niv
-version:        0.2.10
+version:        0.2.11
 synopsis:       Easy dependency management for Nix projects
 description:    Easy dependency management for Nix projects.
 category:       Development
diff --git a/nix/sources.nix b/nix/sources.nix
--- a/nix/sources.nix
+++ b/nix/sources.nix
@@ -125,11 +125,14 @@
   # The "config" used by the fetchers
   mkConfig =
     { sourcesFile ? ./sources.json
+    , sources ? builtins.fromJSON (builtins.readFile sourcesFile)
+    , pkgs ? mkPkgs sources
     }: rec {
       # The sources, i.e. the attribute set of spec name to spec
-      sources = builtins.fromJSON (builtins.readFile sourcesFile);
+      inherit sources;
+
       # The "pkgs" (evaluated nixpkgs) to use for e.g. non-builtin fetchers
-      pkgs = mkPkgs sources;
+      inherit pkgs;
     };
 in
 mkSources (mkConfig {}) // { __functor = _: settings: mkSources (mkConfig settings); }
diff --git a/src/Niv/Sources.hs b/src/Niv/Sources.hs
--- a/src/Niv/Sources.hs
+++ b/src/Niv/Sources.hs
@@ -145,6 +145,7 @@
   | V12
   | V13
   | V14
+  | V15
   deriving stock (Bounded, Enum, Eq)
 
 -- | A user friendly version
@@ -164,6 +165,7 @@
     V12 -> "12"
     V13 -> "13"
     V14 -> "14"
+    V15 -> "15"
 
 latestVersionMD5 :: T.Text
 latestVersionMD5 = sourcesVersionToMD5 maxBound
@@ -190,6 +192,7 @@
     V12 -> "2f9629ad9a8f181ed71d2a59b454970c"
     V13 -> "5e23c56b92eaade4e664cb16dcac1e0a"
     V14 -> "b470e235e7bcbf106d243fea90b6cfc9"
+    V15 -> "dc11af910773ec9b4e505e0f49ebcfd2"
 
 -- | The MD5 sum of ./nix/sources.nix
 sourcesNixMD5 :: IO T.Text