diff --git a/pkgs/development/ruby-modules/bundler/default.nix b/pkgs/development/ruby-modules/bundler/default.nix
index 04e6a6d35a11..d0b7a1d22a45 100644
--- a/pkgs/development/ruby-modules/bundler/default.nix
+++ b/pkgs/development/ruby-modules/bundler/default.nix
@@ -4,8 +4,8 @@ buildRubyGem rec {
   inherit ruby;
   name = "${gemName}-${version}";
   gemName = "bundler";
-  version = "2.5.5";
-  source.sha256 = "sha256-E8f+JpAw4qZAKmVMBt7/Aa72dM7WSds76YtVA6CApGI=";
+  version = "2.5.6";
+  source.sha256 = "sha256-Gh8h0UVuFt0v7pNGHZZANIBHqi3K9dd2h0pg3dTfXGQ=";
   dontPatchShebangs = true;
 
   postFixup = ''