diff --git a/pkgs/development/tools/rubocop/Gemfile.lock b/pkgs/development/tools/rubocop/Gemfile.lock
index bfa2b7c238a0..d91fcdbb3e99 100644
--- a/pkgs/development/tools/rubocop/Gemfile.lock
+++ b/pkgs/development/tools/rubocop/Gemfile.lock
@@ -8,7 +8,7 @@ GEM
     rainbow (3.0.0)
     regexp_parser (2.0.3)
     rexml (3.2.4)
-    rubocop (1.9.0)
+    rubocop (1.9.1)
       parallel (~> 1.10)
       parser (>= 3.0.0.0)
       rainbow (>= 2.2.2, < 4.0)
diff --git a/pkgs/development/tools/rubocop/gemset.nix b/pkgs/development/tools/rubocop/gemset.nix
index 3fe8d2cd58ab..7de3fd53489e 100644
--- a/pkgs/development/tools/rubocop/gemset.nix
+++ b/pkgs/development/tools/rubocop/gemset.nix
@@ -66,10 +66,10 @@
     platforms = [];
     source = {
       remotes = ["https://rubygems.org"];
-      sha256 = "1wz0prg4kx36smbk7fib4a8cdxrj5b5b31c8bavm082vgcpfk759";
+      sha256 = "06npybjypxsrz09z8ivxqfcwzpbgif6z3hwpp0ls8znqlgp3m922";
       type = "gem";
     };
-    version = "1.9.0";
+    version = "1.9.1";
   };
   rubocop-ast = {
     dependencies = ["parser"];