diff --git a/pkgs/tools/security/zsteg/Gemfile.lock b/pkgs/tools/security/zsteg/Gemfile.lock
index b611fb93f5a9..0cd593f60a0f 100644
--- a/pkgs/tools/security/zsteg/Gemfile.lock
+++ b/pkgs/tools/security/zsteg/Gemfile.lock
@@ -1,13 +1,19 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    iostruct (0.0.4)
-    rainbow (3.0.0)
-    zpng (0.3.1)
-      rainbow
-    zsteg (0.2.2)
-      iostruct
-      zpng (>= 0.3.1)
+    forwardable (1.3.3)
+    iostruct (0.0.5)
+    prime (0.1.2)
+      forwardable
+      singleton
+    rainbow (3.1.1)
+    singleton (0.2.0)
+    zpng (0.4.5)
+      rainbow (~> 3.1.1)
+    zsteg (0.2.13)
+      iostruct (>= 0.0.5)
+      prime
+      zpng (>= 0.4.5)
 
 PLATFORMS
   ruby
@@ -16,4 +22,4 @@ DEPENDENCIES
   zsteg
 
 BUNDLED WITH
-   2.1.4
+   2.4.13
diff --git a/pkgs/tools/security/zsteg/gemset.nix b/pkgs/tools/security/zsteg/gemset.nix
index 4f5bd79ce44c..5cb55829a6ac 100644
--- a/pkgs/tools/security/zsteg/gemset.nix
+++ b/pkgs/tools/security/zsteg/gemset.nix
@@ -1,23 +1,54 @@
 {
+  forwardable = {
+    groups = ["default"];
+    platforms = [];
+    source = {
+      remotes = ["https://rubygems.org"];
+      sha256 = "1b5g1i3xdvmxxpq4qp0z4v78ivqnazz26w110fh4cvzsdayz8zgi";
+      type = "gem";
+    };
+    version = "1.3.3";
+  };
   iostruct = {
     groups = ["default"];
     platforms = [];
     source = {
       remotes = ["https://rubygems.org"];
-      sha256 = "0kwp6ryis32j3z7myw8g7v1yszwrwyl04g2c7flr42pwxga1afxc";
+      sha256 = "1z3vnb8mhzns3ybf78vlj5cy6lq4pyfm8n40kqba2s33xccs3kl0";
       type = "gem";
     };
-    version = "0.0.4";
+    version = "0.0.5";
+  };
+  prime = {
+    dependencies = ["forwardable" "singleton"];
+    groups = ["default"];
+    platforms = [];
+    source = {
+      remotes = ["https://rubygems.org"];
+      sha256 = "1973kz8lbck6ga5v42f55jk8b8pnbgwp9p67dl1xw15gvz55dsfl";
+      type = "gem";
+    };
+    version = "0.1.2";
   };
   rainbow = {
     groups = ["default"];
     platforms = [];
     source = {
       remotes = ["https://rubygems.org"];
-      sha256 = "0bb2fpjspydr6x0s8pn1pqkzmxszvkfapv0p4627mywl7ky4zkhk";
+      sha256 = "0smwg4mii0fm38pyb5fddbmrdpifwv22zv3d3px2xx497am93503";
       type = "gem";
     };
-    version = "3.0.0";
+    version = "3.1.1";
+  };
+  singleton = {
+    groups = ["default"];
+    platforms = [];
+    source = {
+      remotes = ["https://rubygems.org"];
+      sha256 = "0qq54imvbksnckzf9hrq9bjzcdb0n8wfv6l5jc0di10n88277jx6";
+      type = "gem";
+    };
+    version = "0.2.0";
   };
   zpng = {
     dependencies = ["rainbow"];
@@ -25,20 +56,20 @@
     platforms = [];
     source = {
       remotes = ["https://rubygems.org"];
-      sha256 = "0ciyab7qxqsxjhfvr6rbpdzg655fi1zygqg9sd9m6wmgc037dj74";
+      sha256 = "0xyr7ipgls7wci1gnsz340idm69jls0gind0q4f63ccjwgzsfkqw";
       type = "gem";
     };
-    version = "0.3.1";
+    version = "0.4.5";
   };
   zsteg = {
-    dependencies = ["iostruct" "zpng"];
+    dependencies = ["iostruct" "prime" "zpng"];
     groups = ["default"];
     platforms = [];
     source = {
       remotes = ["https://rubygems.org"];
-      sha256 = "1mwajlsgs27449n2yf2f9hz8g46qv9bz9f58i9cz1jg58spvpxpk";
+      sha256 = "128kbv9vsi288mj17zwvc45ijpzf3p116vk9kcvkz978hz0n6spm";
       type = "gem";
     };
-    version = "0.2.2";
+    version = "0.2.13";
   };
 }