diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3e1a284726..02794be454 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -13,6 +13,10 @@
 * [#371](https://github.com/rubocop-hq/rubocop-rails/pull/371): Fix an infinite loop error for `Rails/ActiveRecordCallbacksOrder` when callbacks have inline comments. ([@fatkodima][])
 * [#364](https://github.com/rubocop-hq/rubocop-rails/pull/364): Fix a problem that `Rails/UniqueValidationWithoutIndex` doesn't work in classes defined with compact style. ([@sinsoku][])
 
+# Changes
+
+* [rubocop-hq/rubocop#8950](https://github.com/rubocop-hq/rubocop/issues/8950): Update `IgnoredMethods` list for `Lint/NumberConversion` to allow Rails' duration methods. ([@dvandersluis][])
+
 ## 2.8.1 (2020-09-16)
 
 ### Bug fixes
diff --git a/config/default.yml b/config/default.yml
index f8fd0f542a..aba10c768d 100644
--- a/config/default.yml
+++ b/config/default.yml
@@ -17,6 +17,26 @@ AllCops:
   # as the default.
   TargetRailsVersion: ~
 
+Lint/NumberConversion:
+  # Add Rails' duration methods to the ignore list for `Lint/NumberConversion`
+  # so that calling `to_i` on one of these does not register an offense.
+  IgnoredMethods:
+    - ago
+    - from_now
+    - second
+    - seconds
+    - minute
+    - minutes
+    - hour
+    - hours
+    - day
+    - days
+    - week
+    - weeks
+    - fortnight
+    - fortnights
+    - in_milliseconds
+
 Rails/ActionFilter:
   Description: 'Enforces consistent use of action filter methods.'
   Enabled: true