diff --git a/pkgs/development/ruby-modules/gem-config/default.nix b/pkgs/development/ruby-modules/gem-config/default.nix
index 2885eeb04119..236570be0dcf 100644
--- a/pkgs/development/ruby-modules/gem-config/default.nix
+++ b/pkgs/development/ruby-modules/gem-config/default.nix
@@ -370,7 +370,7 @@ in
   # otherwise the gem will fail to link to the libv8 binary.
   # see: https://github.com/cowboyd/libv8/pull/161
   libv8 = attrs: {
-    buildInputs = [ which v8 python2 ];
+    buildInputs = [ which v8 python3 ];
     buildFlags = [ "--with-system-v8=true" ];
     dontBuild = false;
     # The gem includes broken symlinks which are ignored during unpacking, but