diff --git a/frontend/src/pages/Admin/Users/NewUserModal/index.jsx b/frontend/src/pages/Admin/Users/NewUserModal/index.jsx
index 8b11c1a1128..236b8c78119 100644
--- a/frontend/src/pages/Admin/Users/NewUserModal/index.jsx
+++ b/frontend/src/pages/Admin/Users/NewUserModal/index.jsx
@@ -62,17 +62,10 @@ export default function NewUserModal({ closeModal }) {
                   minLength={2}
                   required={true}
                   autoComplete="off"
-                  pattern="^[a-z0-9_-]+$"
-                  onInvalid={(e) =>
-                    e.target.setCustomValidity(
-                      "Username must only contain lowercase letters, numbers, underscores, and hyphens with no spaces"
-                    )
-                  }
-                  onChange={(e) => e.target.setCustomValidity("")}
                 />
                 <p className="mt-2 text-xs text-white/60">
-                  Username must only contain lowercase letters, numbers,
-                  underscores, and hyphens with no spaces
+                  Username must only contain lowercase letters, periods,
+                  numbers, underscores, and hyphens with no spaces
                 </p>
               </div>
               <div>
diff --git a/frontend/src/pages/Admin/Users/UserRow/EditUserModal/index.jsx b/frontend/src/pages/Admin/Users/UserRow/EditUserModal/index.jsx
index 5a88e4d898d..aaf1b658be3 100644
--- a/frontend/src/pages/Admin/Users/UserRow/EditUserModal/index.jsx
+++ b/frontend/src/pages/Admin/Users/UserRow/EditUserModal/index.jsx
@@ -80,8 +80,8 @@ export default function EditUserModal({ currentUser, user, closeModal }) {
                   autoComplete="off"
                 />
                 <p className="mt-2 text-xs text-white/60">
-                  Username must only contain lowercase letters, numbers,
-                  underscores, and hyphens with no spaces
+                  Username must only contain lowercase letters, periods,
+                  numbers, underscores, and hyphens with no spaces
                 </p>
               </div>
               <div>
diff --git a/server/models/user.js b/server/models/user.js
index 5979de34788..35e8271bcfd 100644
--- a/server/models/user.js
+++ b/server/models/user.js
@@ -13,7 +13,7 @@ const { EventLogs } = require("./eventLogs");
  */
 
 const User = {
-  usernameRegex: new RegExp(/^[a-z0-9_-]+$/),
+  usernameRegex: new RegExp(/^[a-z0-9_\-.]+$/),
   writable: [
     // Used for generic updates so we can validate keys in request body
     "username",
@@ -95,7 +95,7 @@ const User = {
       // Do not allow new users to bypass validation
       if (!this.usernameRegex.test(username))
         throw new Error(
-          "Username must only contain lowercase letters, numbers, underscores, and hyphens with no spaces"
+          "Username must only contain lowercase letters, periods, numbers, underscores, and hyphens with no spaces"
         );
 
       const bcrypt = require("bcrypt");
@@ -175,7 +175,7 @@ const User = {
         return {
           success: false,
           error:
-            "Username must only contain lowercase letters, numbers, underscores, and hyphens with no spaces",
+            "Username must only contain lowercase letters, periods, numbers, underscores, and hyphens with no spaces",
         };
 
       const user = await prisma.users.update({