diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5f6e75f2..a8fc3c09 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,6 +8,7 @@
 - [310](https://github.com/Shopify/job-iteration/pull/310) - Support nested iteration
 - [338](https://github.com/Shopify/job-iteration/pull/338) - All logs are now `ActiveSupport::Notifications` events and logged using `ActiveSupport::LogSubscriber` to allow customization. Events now always include the `cursor_position` tag.
 - [341](https://github.com/Shopify/job-iteration/pull/341) - Add `JobIteration.default_retry_backoff`, which sets a default delay when jobs are re-enqueued after being interrupted. Defaults to `nil`, meaning no delay, which matches the current behaviour.
+- [417](https://github.com/Shopify/job-iteration/pull/417) - Ensure that numerical values are deserialized as such and not as strings.
 
 ## v1.3.6 (Mar 9, 2022)
 
diff --git a/lib/job-iteration/iteration.rb b/lib/job-iteration/iteration.rb
index acccdc6b..7a6224a2 100644
--- a/lib/job-iteration/iteration.rb
+++ b/lib/job-iteration/iteration.rb
@@ -119,8 +119,8 @@ def serialize # @private
     def deserialize(job_data) # @private
       super
       self.cursor_position = job_data["cursor_position"]
-      self.times_interrupted = job_data["times_interrupted"] || 0
-      self.total_time = job_data["total_time"] || 0
+      self.times_interrupted = Integer(job_data["times_interrupted"] || 0)
+      self.total_time = Float(job_data["total_time"] || 0.0)
     end
 
     def perform(*params) # @private