diff --git a/nixpkgs.nix b/nixpkgs.nix
index 4da4ebde4..2b7d682d5 100644
--- a/nixpkgs.nix
+++ b/nixpkgs.nix
@@ -1,6 +1,7 @@
 let
-  nixpkgsRev = "75942f96b3f7136cdc9cc7d9704824f17fabec02";
-  nixpkgsSha256 = "0ay4v4n856xl79ilym4w6vbp6pxzmn8l31j1ch98wa1lj7l71lgi";
+  # nixpkgs-unstable as of 2019-04-25
+  nixpkgsRev = "0620e0fdbf4";
+  nixpkgsSha256 = "046l2c83s568c306hnm8nfdpdhmgnbzgid354hr7p0khq3jx3lhf";
   nixpkgs = fetchTarball {
     url = "https://github.com/nixos/nixpkgs/archive/${nixpkgsRev}.tar.gz";
     sha256 = nixpkgsSha256;