diff --git a/CHANGELOG.md b/CHANGELOG.md
index c89bd17..af6dbbe 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 # Changelog
 
+## [0.2.11] 2020-01-07
+## Changed
+* Users can set custom `pkgs` when `import`ing `sources.nix`
+
 ## [0.2.10] 2020-01-06
 ## Changed
 * The bundled `nix/sources.nix` is formatted with `nixpkgs-fmt`
diff --git a/README.md b/README.md
index fb936a9..375669b 100644
--- a/README.md
+++ b/README.md
@@ -199,7 +199,7 @@ $ niv update ghc -v 8.6.2
 ```
 niv - dependency manager for Nix projects
 
-version: 0.2.10
+version: 0.2.11
 
 Usage: niv [-s|--sources-file FILE] COMMAND
 
diff --git a/nix/sources.nix b/nix/sources.nix
index b53359f..6e2bf23 100644
--- a/nix/sources.nix
+++ b/nix/sources.nix
@@ -125,11 +125,14 @@ let
   # 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/package.yaml b/package.yaml
index cfd2326..5e43b7b 100644
--- a/package.yaml
+++ b/package.yaml
@@ -1,5 +1,5 @@
 name: niv
-version: 0.2.10
+version: 0.2.11
 license: MIT
 author: Nicolas Mattia <nicolas@nmattia.com>
 maintainer: Nicolas Mattia <nicolas@nmattia.com>
diff --git a/script/gen b/script/gen
index 82daec0..75a53e4 100755
--- a/script/gen
+++ b/script/gen
@@ -3,10 +3,6 @@
 #!nix-shell -I nixpkgs=./nix
 #!nix-shell -p nix
 #!nix-shell --keep GITHUB_TOKEN
-#!nix-shell --pure
-
-unset NIX_SSL_CERT_FILE
-unset SSL_CERT_FILE
 
 set -euo pipefail
 
diff --git a/script/test b/script/test
index 381f293..08b192e 100755
--- a/script/test
+++ b/script/test
@@ -3,10 +3,6 @@
 #!nix-shell -I nixpkgs=./nix
 #!nix-shell -p nix
 #!nix-shell -p nixpkgs-fmt
-#!nix-shell --pure
-
-unset NIX_SSL_CERT_FILE
-unset SSL_CERT_FILE
 
 set -euo pipefail
 
diff --git a/src/Niv/Sources.hs b/src/Niv/Sources.hs
index 2c9ec14..d16eee2 100644
--- a/src/Niv/Sources.hs
+++ b/src/Niv/Sources.hs
@@ -145,6 +145,7 @@ data SourcesNixVersion
   | V12
   | V13
   | V14
+  | V15
   deriving stock (Bounded, Enum, Eq)
 
 -- | A user friendly version
@@ -164,6 +165,7 @@ sourcesVersionToText = \case
     V12 -> "12"
     V13 -> "13"
     V14 -> "14"
+    V15 -> "15"
 
 latestVersionMD5 :: T.Text
 latestVersionMD5 = sourcesVersionToMD5 maxBound
@@ -190,6 +192,7 @@ sourcesVersionToMD5 = \case
     V12 -> "2f9629ad9a8f181ed71d2a59b454970c"
     V13 -> "5e23c56b92eaade4e664cb16dcac1e0a"
     V14 -> "b470e235e7bcbf106d243fea90b6cfc9"
+    V15 -> "dc11af910773ec9b4e505e0f49ebcfd2"
 
 -- | The MD5 sum of ./nix/sources.nix
 sourcesNixMD5 :: IO T.Text