diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0027fb9..e61eafb 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Added
+
+- Retry failed job with modified arguments — the Arguments card on the job detail page becomes an editable textarea for failed jobs; editing the JSON and clicking "Retry with these arguments" updates the job record and retries in one step; invalid JSON redirects back with an error message without touching the failed execution
+
 ## [1.0.0] - 2026-05-21
 
 ### Added
diff --git a/README.md b/README.md
index 5a844e4..5cf32ca 100644
--- a/README.md
+++ b/README.md
@@ -40,7 +40,7 @@ SolidQueueWeb surfaces all of this in a browser UI available at any route you ch
 - **Jobs** — filterable by status (ready, scheduled, claimed, blocked, failed), queue, and priority; search by job class name with dynamic auto-submit; time-based period filter (1 h / 24 h / 7 d); discard individual or all jobs; Turbo Frame navigation so only the table updates on filter or search; auto-refreshes every 10 seconds
 - **Scheduled job management** — reschedule a scheduled job to run immediately ("Run Now") or push its `scheduled_at` forward by 1 h, 24 h, or 7 d; Turbo Stream responses update the row in place; "Run All Now" bulk action promotes every scheduled job in the current filtered view in a single operation
 - **Failed jobs** — list of failed executions with error details; search by class name; filter by queue; time-based period filter; retry or discard individually or in bulk; bulk retry with configurable stagger (+5s / +10s / +30s / +1m) to avoid thundering herd on recovery
-- **Job detail** — full arguments, timestamps, blocked-until date, and error backtrace; action buttons based on job status
+- **Job detail** — full arguments, timestamps, blocked-until date, and error backtrace; action buttons based on job status; failed jobs show an editable arguments textarea so you can correct a bad payload and retry in one step without redeploying
 - **Queue management** — pause and resume individual queues; queue-scoped job list with status filter, search, and discard
 - **Recurring tasks** — all configured recurring tasks with cron schedule, next run time, last run time, and static/dynamic classification; "Run Now" button enqueues a task immediately without waiting for its next scheduled run
 - **Processes** — workers, dispatchers, and supervisors with heartbeat health status; auto-refreshes every 10 seconds
diff --git a/ROADMAP.md b/ROADMAP.md
index 1d8e39a..54b3c6a 100644
--- a/ROADMAP.md
+++ b/ROADMAP.md
@@ -12,7 +12,7 @@ Pull requests for any of these are welcome. See [Contributing](README.md#contrib
 
 | Feature | Notes |
 |---|---|
-| **Retry failed job with modified arguments** | Form on the job detail page — edit the arguments JSON before retrying. Fixes bad payloads without redeploying. |
+| ~~**Retry failed job with modified arguments**~~ | ✓ Shipped — editable textarea on the job detail page; submitting updates the job record and retries in one step. |
 | **Multiple webhook targets** | Change `alert_webhook_url` to accept an array. Fan out to Slack + PagerDuty simultaneously. |
 | **Queue depth alert** | Fire a webhook when a queue's ready count exceeds a per-queue threshold (e.g. `alert_queue_thresholds: { critical: 50 }`). |
 
diff --git a/app/assets/stylesheets/solid_queue_web/_07_forms.css b/app/assets/stylesheets/solid_queue_web/_07_forms.css
index 5f4dabc..6ab5e18 100644
--- a/app/assets/stylesheets/solid_queue_web/_07_forms.css
+++ b/app/assets/stylesheets/solid_queue_web/_07_forms.css
@@ -117,4 +117,28 @@
   background: var(--muted);
   border-color: var(--muted);
   color: #fff;
+}
+
+.sqd-textarea {
+  width: 100%;
+  padding: 0.5rem 0.75rem;
+  border: 1px solid var(--border);
+  border-radius: 5px;
+  font-size: 13px;
+  background: var(--surface);
+  color: var(--text);
+  line-height: 1.6;
+  resize: vertical;
+  box-sizing: border-box;
+  display: block;
+}
+
+.sqd-textarea:focus {
+  outline: 2px solid var(--primary);
+  outline-offset: -1px;
+  border-color: var(--primary);
+}
+
+.sqd-args-form__submit {
+  margin-top: 0.75rem;
 }
\ No newline at end of file
diff --git a/app/controllers/solid_queue_web/failed_jobs/arguments_controller.rb b/app/controllers/solid_queue_web/failed_jobs/arguments_controller.rb
new file mode 100644
index 0000000..1384185
--- /dev/null
+++ b/app/controllers/solid_queue_web/failed_jobs/arguments_controller.rb
@@ -0,0 +1,15 @@
+module SolidQueueWeb
+  class FailedJobs::ArgumentsController < ApplicationController
+    def update
+      execution = SolidQueue::FailedExecution.find(params[:failed_job_id])
+      new_arguments = JSON.parse(params[:arguments])
+      execution.job.update!(arguments: new_arguments)
+      execution.retry
+      redirect_to failed_jobs_path, notice: "Job arguments updated and queued for retry."
+    rescue JSON::ParserError
+      redirect_to job_path(execution.job), alert: "Invalid JSON: could not parse arguments."
+    rescue => e
+      redirect_to failed_jobs_path, alert: "Could not update job: #{e.message}"
+    end
+  end
+end
diff --git a/app/views/solid_queue_web/jobs/show.html.erb b/app/views/solid_queue_web/jobs/show.html.erb
index 6a8acfa..31d0df6 100644
--- a/app/views/solid_queue_web/jobs/show.html.erb
+++ b/app/views/solid_queue_web/jobs/show.html.erb
@@ -63,7 +63,19 @@
 
   <div class="sqd-card sqd-detail-section">
     <h2 class="sqd-section-title">Arguments</h2>
-    <pre class="sqd-pre"><%= JSON.pretty_generate(@job.arguments) rescue @job.arguments.inspect %></pre>
+    <% if @execution_status == "failed" && @job.failed_execution %>
+      <% args_json = begin; JSON.pretty_generate(@job.arguments); rescue; @job.arguments.inspect; end %>
+      <%= form_with url: failed_job_arguments_path(@job.failed_execution), method: :patch do |f| %>
+        <%= f.text_area :arguments,
+              value: args_json,
+              class: "sqd-textarea sqd-mono",
+              rows: [args_json.lines.count + 1, 6].max,
+              "aria-label": "Job arguments JSON" %>
+        <%= f.submit "Retry with these arguments", class: "sqd-btn sqd-btn--primary sqd-args-form__submit" %>
+      <% end %>
+    <% else %>
+      <pre class="sqd-pre"><%= JSON.pretty_generate(@job.arguments) rescue @job.arguments.inspect %></pre>
+    <% end %>
   </div>
 </div>
 
diff --git a/config/routes.rb b/config/routes.rb
index 86cfd55..3e10857 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -38,6 +38,7 @@
   resource :failed_job_selection, path: "failed_jobs/selection", only: [:create, :destroy],
            controller: "failed_jobs/selections"
   resources :failed_jobs, only: [:index, :destroy] do
+    resource :arguments, only: [:update], controller: "failed_jobs/arguments"
     collection do
       post :retry_all,   to: "retry_failed_jobs#create"
       post :discard_all, action: :destroy
diff --git a/spec/requests/solid_queue_web/failed_job_arguments_spec.rb b/spec/requests/solid_queue_web/failed_job_arguments_spec.rb
new file mode 100644
index 0000000..31b7128
--- /dev/null
+++ b/spec/requests/solid_queue_web/failed_job_arguments_spec.rb
@@ -0,0 +1,67 @@
+require "rails_helper"
+
+RSpec.describe "FailedJobs::Arguments", type: :request do
+  let(:job) do
+    SolidQueue::Job.create!(
+      queue_name: "default",
+      class_name: "TestJob",
+      arguments: { user_id: 42 },
+      active_job_id: SecureRandom.uuid
+    )
+  end
+
+  let!(:execution) do
+    job.ready_execution&.destroy
+    SolidQueue::FailedExecution.create!(
+      job: job,
+      error: { exception_class: "RuntimeError", message: "boom", backtrace: [] }
+    )
+  end
+
+  describe "PATCH /jobs/failed_jobs/:failed_job_id/arguments" do
+    it "updates the job arguments and retries" do
+      patch "/jobs/failed_jobs/#{execution.id}/arguments",
+        params: { arguments: { user_id: 999 }.to_json }
+      expect(response).to redirect_to("/jobs/failed_jobs")
+      follow_redirect!
+      expect(response.body).to include("queued for retry")
+    end
+
+    it "removes the failed execution on success" do
+      expect {
+        patch "/jobs/failed_jobs/#{execution.id}/arguments",
+          params: { arguments: { user_id: 999 }.to_json }
+      }.to change(SolidQueue::FailedExecution, :count).by(-1)
+    end
+
+    it "persists the new arguments on the job" do
+      patch "/jobs/failed_jobs/#{execution.id}/arguments",
+        params: { arguments: { user_id: 999 }.to_json }
+      expect(job.reload.arguments).to include("user_id" => 999)
+    end
+
+    it "redirects to the job detail page on invalid JSON" do
+      patch "/jobs/failed_jobs/#{execution.id}/arguments",
+        params: { arguments: "not valid json{{" }
+      expect(response).to redirect_to("/jobs/list/#{job.id}")
+      follow_redirect!
+      expect(response.body).to include("Invalid JSON")
+    end
+
+    it "leaves the failed execution in place on invalid JSON" do
+      expect {
+        patch "/jobs/failed_jobs/#{execution.id}/arguments",
+          params: { arguments: "not valid json{{" }
+      }.not_to change(SolidQueue::FailedExecution, :count)
+    end
+
+    it "handles unexpected errors gracefully" do
+      allow_any_instance_of(SolidQueue::FailedExecution).to receive(:retry).and_raise(RuntimeError, "db error")
+      patch "/jobs/failed_jobs/#{execution.id}/arguments",
+        params: { arguments: { user_id: 1 }.to_json }
+      expect(response).to redirect_to("/jobs/failed_jobs")
+      follow_redirect!
+      expect(response.body).to include("Could not update job")
+    end
+  end
+end