diff --git a/pkgs/by-name/un/unit/package.nix b/pkgs/by-name/un/unit/package.nix
index 5ac7dbc9ab7e..e27248e00a1f 100644
--- a/pkgs/by-name/un/unit/package.nix
+++ b/pkgs/by-name/un/unit/package.nix
@@ -12,8 +12,6 @@
   php82,
   withPerl ? true,
   perl,
-  withRuby_3_1 ? true,
-  ruby_3_1,
   withRuby_3_2 ? false,
   ruby_3_2,
   withSSL ? true,
@@ -58,7 +56,6 @@ stdenv.mkDerivation rec {
   ]
   ++ optional withPHP82 php82-unit
   ++ optional withPerl perl
-  ++ optional withRuby_3_1 ruby_3_1
   ++ optional withRuby_3_2 ruby_3_2
   ++ optional withSSL openssl;
 
@@ -79,7 +76,6 @@ stdenv.mkDerivation rec {
     ${optionalString withPython3 "./configure python --module=python3  --config=python3-config  --lib-path=${python3}/lib"}
     ${optionalString withPHP82 "./configure php    --module=php82    --config=${php82-unit.unwrapped.dev}/bin/php-config --lib-path=${php82-unit}/lib"}
     ${optionalString withPerl "./configure perl   --module=perl     --perl=${perl}/bin/perl"}
-    ${optionalString withRuby_3_1 "./configure ruby   --module=ruby31   --ruby=${ruby_3_1}/bin/ruby"}
     ${optionalString withRuby_3_2 "./configure ruby   --module=ruby32   --ruby=${ruby_3_2}/bin/ruby"}
   '';