diff --git a/gemset.nix b/gemset.nix
index c57bfdb2c..3dde78c70 100644
--- a/gemset.nix
+++ b/gemset.nix
@@ -1074,6 +1074,14 @@
     version = "1.0.2";
   };
   matrix = {
+    groups = ["default" "test"];
+    platforms = [];
+    source = {
+      remotes = ["https://rubygems.org"];
+      sha256 = "1ypdmpdn20hxp5vwxz3zc04r5xcwqc25qszdlg41h8ghdqbllwmw";
+      type = "gem";
+    };
+    version = "0.4.2";
   };
   memoist = {
     groups = ["default"];
@@ -1570,6 +1578,14 @@
     version = "3.1.1";
   };
   rake = {
+    groups = ["development"];
+    platforms = [];
+    source = {
+      remotes = ["https://rubygems.org"];
+      sha256 = "15whn7p9nrkxangbs9hh75q585yfn66lv0v2mhj6q6dl6x8bzr2w";
+      type = "gem";
+    };
+    version = "13.0.6";
   };
   rakismet = {
     groups = ["default"];
@@ -1721,6 +1737,14 @@
     version = "2.1.1";
   };
   rexml = {
+    groups = ["default"];
+    platforms = [];
+    source = {
+      remotes = ["https://rubygems.org"];
+      sha256 = "08ximcyfjy94pm1rhcx04ny1vx2sk0x4y185gzn86yfsbzwkng53";
+      type = "gem";
+    };
+    version = "3.2.5";
   };
   rover-df = {
     dependencies = ["numo-narray"];