diff --git a/pkgs/development/interpreters/ruby/default.nix b/pkgs/development/interpreters/ruby/default.nix
index 7169d09e4127..b4cd9f3f4180 100644
--- a/pkgs/development/interpreters/ruby/default.nix
+++ b/pkgs/development/interpreters/ruby/default.nix
@@ -212,11 +212,11 @@ in {
     };
   };
 
-  ruby_2_4_1 = generic {
-    version = rubyVersion "2" "4" "1" "";
+  ruby_2_4_2 = generic {
+    version = rubyVersion "2" "4" "2" "";
     sha256 = {
-      src = "0l0201fqwzwygnrgxay469gbb2w865bnqckq00x3prdmbh6y2c53";
-      git = "1gjn31ymypzzcwkrjx62hqw59fywz1x3cyvmi1f2yb9bwb3659ss";
+      src = "174cdiz3am1f76vsnm3iqi9c5vqphypbf9kbxx6vqqmj01gfgfck";
+      git = "1w83kzak3m6vv3k09ynfw9vpgc7vpmij3x3zmgrhwm4ds1sp5irl";
     };
   };
 }
diff --git a/pkgs/development/interpreters/ruby/patchsets.nix b/pkgs/development/interpreters/ruby/patchsets.nix
index f6ecb7c8e285..cdf1bf26717f 100644
--- a/pkgs/development/interpreters/ruby/patchsets.nix
+++ b/pkgs/development/interpreters/ruby/patchsets.nix
@@ -34,7 +34,7 @@ rec {
     "${patchSet}/patches/ruby/2.3/head/railsexpress/02-improve-gc-stats.patch"
     "${patchSet}/patches/ruby/2.3/head/railsexpress/03-display-more-detailed-stack-trace.patch"
   ];
-  "2.4.1" = ops useRailsExpress [
+  "2.4.2" = ops useRailsExpress [
     "${patchSet}/patches/ruby/2.4/head/railsexpress/01-skip-broken-tests.patch"
     "${patchSet}/patches/ruby/2.4/head/railsexpress/02-improve-gc-stats.patch"
     "${patchSet}/patches/ruby/2.4/head/railsexpress/03-display-more-detailed-stack-trace.patch"
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index c0e430ddac08..e2c7ac55350e 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -6584,7 +6584,7 @@ with pkgs;
     ruby_2_1_10
     ruby_2_2_7
     ruby_2_3_4
-    ruby_2_4_1;
+    ruby_2_4_2;
 
   # Ruby aliases
   ruby = ruby_2_3;
@@ -6592,7 +6592,7 @@ with pkgs;
   ruby_2_1 = ruby_2_1_10;
   ruby_2_2 = ruby_2_2_7;
   ruby_2_3 = ruby_2_3_4;
-  ruby_2_4 = ruby_2_4_1;
+  ruby_2_4 = ruby_2_4_2;
 
   scsh = callPackage ../development/interpreters/scsh { };