diff --git a/CHANGELOG.md b/CHANGELOG.md
index 994629f2..3c08597c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,7 @@ This project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.htm
 - `bad_string_escape` now correctly handles escapes of the shape `\1a` (one or two numbers followed by a hex digit). (#292)[https://github.com/Kampfkarren/selene/issues/292]
 
 ### Changed
+- `duplicate_keys` now has a error severity. [(#262)](https://github.com/Kampfkarren/selene/issues/262)
 - Arguments of `collectgarbage` now considered to be optional. [(#287)](https://github.com/Kampfkarren/selene/issues/287)
 
 ## [0.14.0] - 2021-07-07
diff --git a/selene-lib/src/rules/duplicate_keys.rs b/selene-lib/src/rules/duplicate_keys.rs
index fead2893..76154a08 100644
--- a/selene-lib/src/rules/duplicate_keys.rs
+++ b/selene-lib/src/rules/duplicate_keys.rs
@@ -45,7 +45,7 @@ impl Rule for DuplicateKeysLint {
     }
 
     fn severity(&self) -> Severity {
-        Severity::Warning
+        Severity::Error
     }
 
     fn rule_type(&self) -> RuleType {