diff --git a/flake.lock b/flake.lock
index 29ece58..9c27964 100644
--- a/flake.lock
+++ b/flake.lock
@@ -121,12 +121,12 @@
         "up": "up"
       },
       "locked": {
-        "lastModified": 1793051552,
-        "narHash": "sha256-2vsibE2BVtODcFc3EtR/1pduAFRWtSQM4ufTOnIsU4U=",
-        "rev": "aa86b528fe08dc171af80889f35c01d5775cac55",
-        "revCount": 536,
+        "lastModified": 1793084199,
+        "narHash": "sha256-fdNusIwrs76leC5c+kicfPzMCm9/RDWoZyck7+zW9ZM=",
+        "rev": "b6971c3ecc522b70e724210b67e8ca77a3f2e4f4",
+        "revCount": 552,
         "type": "tarball",
-        "url": "https://api.flakehub.com/f/pinned/dataheld/nullkomma/0.1.536%2Brev-aa86b528fe08dc171af80889f35c01d5775cac55/01a17a41-c539-7441-8ed3-a70328b92a9b/source.tar.gz"
+        "url": "https://api.flakehub.com/f/pinned/dataheld/nullkomma/0.1.552%2Brev-b6971c3ecc522b70e724210b67e8ca77a3f2e4f4/01a17c2f-23d4-7ab3-a1ad-510f75d72d8b/source.tar.gz"
       },
       "original": {
         "type": "tarball",
diff --git a/flake.nix b/flake.nix
index f25821a..2ee229d 100644
--- a/flake.nix
+++ b/flake.nix
@@ -33,7 +33,6 @@
           function = "counter_button_app";
         };
         nullkomma.r.pkgdown.brand.enable = true;
-        nullkomma.r.allowOffNixpkgs = true;
         nullkomma.r.check.args = [
           "--no-manual"
           "--ignore-vignettes"
@@ -42,7 +41,7 @@
         nullkomma.r.hashes.rdtools = "sha256-8BQ/3Vdl1vndn4BNdoHfjo4TP4ioBWv3Y1bZu22ej70=";
 
         perSystem =
-          { config, pkgs, ... }:
+          { config, ... }:
           let
             testEnvironment = ''
               export SHINYTEST2_LOAD_TIMEOUT=16000 SHINYTEST2_TIMEOUT=8000
@@ -51,30 +50,6 @@
             '';
           in
           {
-            nullkomma.r.browser = lib.mkIf pkgs.stdenv.isLinux (
-              pkgs.writeShellApplication {
-                name = "crow-chromium";
-                text = ''
-                  export FONTCONFIG_FILE=${
-                    pkgs.makeFontsConf {
-                      fontDirectories = [
-                        pkgs.liberation_ttf
-                        pkgs.dejavu_fonts
-                      ];
-                    }
-                  }
-                  exec ${lib.getExe pkgs.chromium} "$@"
-                '';
-              }
-            );
-            # Elf's native-R profile must not hide Nix's build dependencies.
-            nullkomma.r.buildInputs.elf = [
-              (pkgs.writeTextFile {
-                name = "elf-nix-startup";
-                destination = "/nix-support/setup-hook";
-                text = "export NULLKOMMA_R_NIX=true";
-              })
-            ];
             nullkomma.devShell.shellHook = testEnvironment;
             nullkomma.checks = {
               r-cmd-check.command = lib.mkBefore testEnvironment;