Bump nixpkgs again.

.circleci/config.yml

@@ -29,7 +29,7 @@ jobs:
       # time of this comment.  We can bump it to a newer version when that
       # makes sense.  Meanwhile, the platform won't shift around beneath us
       # unexpectedly.
-      NIXPKGS_REV: "5de44c15758465f8ddf84d541ba300b48e56eda4"
+      NIXPKGS_REV: "92609f3d9bc3acffbdbe54fa1c591a885612aa73"
 
     steps:
       - run:

nix/sources.json

@@ -24,15 +24,15 @@
         "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
     },
     "nixpkgs": {
-        "branch": "release-20.03",
+        "branch": "release-21.05",
         "description": "Nix Packages collection",
         "homepage": "",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "246b75a0d0d7da135a3e62c686b98975c30df42c",
-        "sha256": "0px8k4lh5nhq6f7pxqw8yawl5494njv22z4rmssywqkanf1xjs32",
+        "rev": "92609f3d9bc3acffbdbe54fa1c591a885612aa73",
+        "sha256": "09n9j2lr8632xrslpwsk4222xcq7h1f7lj0vjc2b90v3c64hqwml",
         "type": "tarball",
-        "url": "https://github.com/NixOS/nixpkgs/archive/246b75a0d0d7da135a3e62c686b98975c30df42c.tar.gz",
+        "url": "https://github.com/NixOS/nixpkgs/archive/92609f3d9bc3acffbdbe54fa1c591a885612aa73.tar.gz",
         "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
     }
 }