diff --git a/pkgs/development/tools/yarn2nix-moretea/fetch-source.nix b/pkgs/development/tools/yarn2nix-moretea/fetch-source.nix
index b15b40c4a04..fc9b149887a 100644
--- a/pkgs/development/tools/yarn2nix-moretea/fetch-source.nix
+++ b/pkgs/development/tools/yarn2nix-moretea/fetch-source.nix
@@ -5,6 +5,6 @@
 fetchFromGitHub {
   owner  = "moretea";
   repo   = "yarn2nix";
-  rev    = "3f2dbb08724bf8841609f932bfe1d61a78277232";
-  sha256 = "142av7dwviapsnahgj8r6779gs2zr17achzhr8b97s0hsl08dcl2";
+  rev    = "9e7279edde2a4e0f5ec04c53f5cd64440a27a1ae";
+  sha256 = "0zz2lrwn3y3rb8gzaiwxgz02dvy3s552zc70zvfqc0zh5dhydgn7";
 }
diff --git a/pkgs/development/tools/yarn2nix-moretea/yarn2nix/default.nix b/pkgs/development/tools/yarn2nix-moretea/yarn2nix/default.nix
index f5989390c4b..22032e145d3 100644
--- a/pkgs/development/tools/yarn2nix-moretea/yarn2nix/default.nix
+++ b/pkgs/development/tools/yarn2nix-moretea/yarn2nix/default.nix
@@ -238,7 +238,7 @@ in rec {
       package = lib.importJSON packageJSON;
       pname = package.name;
       safeName = reformatPackageName pname;
-      version = package.version;
+      version = package.version or attrs.version;
       baseName = unlessNull name "${safeName}-${version}";
 
       workspaceDependenciesTransitive = lib.unique (
@@ -389,6 +389,11 @@ in rec {
     # yarn2nix is the only package that requires the yarnNix option.
     # All the other projects can auto-generate that file.
     yarnNix = ./yarn.nix;
+    
+    # Using the filter above and importing package.json from the filtered
+    # source results in an error in restricted mode. To circumvent this,
+    # we import package.json from the unfiltered source
+    packageJSON = ./package.json;
 
     yarnFlags = defaultYarnFlags ++ ["--production=true"];