diff --git a/crates/ruff_linter/src/codes.rs b/crates/ruff_linter/src/codes.rs
index 188ab0931a66c1..e0e09a28edfffc 100644
--- a/crates/ruff_linter/src/codes.rs
+++ b/crates/ruff_linter/src/codes.rs
@@ -1005,7 +1005,7 @@ pub fn code_to_rule(linter: Linter, code: &str) -> Option<(RuleGroup, Rule)> {
         (Ruff, "047") => (RuleGroup::Preview, rules::ruff::rules::NeedlessElse),
         (Ruff, "048") => (RuleGroup::Preview, rules::ruff::rules::MapIntVersionParsing),
         (Ruff, "049") => (RuleGroup::Preview, rules::ruff::rules::DataclassEnum),
-        (Ruff, "051") => (RuleGroup::Preview, rules::ruff::rules::IfKeyInDictDel),
+        (Ruff, "051") => (RuleGroup::Stable, rules::ruff::rules::IfKeyInDictDel),
         (Ruff, "052") => (RuleGroup::Preview, rules::ruff::rules::UsedDummyVariable),
         (Ruff, "053") => (RuleGroup::Preview, rules::ruff::rules::ClassWithMixedTypeVars),
         (Ruff, "054") => (RuleGroup::Preview, rules::ruff::rules::IndentedFormFeed),