diff --git a/CHANGELOG.md b/CHANGELOG.md
index 76ccb1928..cc73d744f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -11,6 +11,8 @@
 
 ## master (unreleased)
 
+## 1.21.1 (2024-06-16)
+
 ### Bug fixes
 
 * [#452](https://github.com/rubocop/rubocop-performance/pull/452): Fix an error for `Performance/RedundantEqualityComparisonBlock` when the block is empty. ([@earlopain][])
diff --git a/docs/antora.yml b/docs/antora.yml
index 21b1815a3..b1478fcc7 100644
--- a/docs/antora.yml
+++ b/docs/antora.yml
@@ -2,6 +2,6 @@ name: rubocop-performance
 title: RuboCop Performance
 # We always provide version without patch here (e.g. 1.1),
 # as patch versions should not appear in the docs.
-version: ~
+version: '1.21'
 nav:
   - modules/ROOT/nav.adoc
diff --git a/docs/modules/ROOT/pages/cops_performance.adoc b/docs/modules/ROOT/pages/cops_performance.adoc
index f7bf3fad6..b768b06cf 100644
--- a/docs/modules/ROOT/pages/cops_performance.adoc
+++ b/docs/modules/ROOT/pages/cops_performance.adoc
@@ -1169,8 +1169,9 @@ This cop identifies places where `map { ... }.compact` can be replaced by `filte
 
 === Safety
 
-This cop's autocorrection is unsafe because `map { ... }.compact` that is not
-compatible with `filter_map`.
+This cop's autocorrection is unsafe because `map { ... }.compact` might yield
+different results than `filter_map`. As illustrated in the example, `filter_map`
+also filters out falsy values, while `compact` only gets rid of `nil`.
 
 === Examples
 
diff --git a/lib/rubocop/performance/version.rb b/lib/rubocop/performance/version.rb
index 5fcb5a75d..6688e4f13 100644
--- a/lib/rubocop/performance/version.rb
+++ b/lib/rubocop/performance/version.rb
@@ -4,7 +4,7 @@ module RuboCop
   module Performance
     # This module holds the RuboCop Performance version information.
     module Version
-      STRING = '1.21.0'
+      STRING = '1.21.1'
 
       def self.document_version
         STRING.match('\d+\.\d+').to_s
diff --git a/relnotes/v1.21.1.md b/relnotes/v1.21.1.md
new file mode 100644
index 000000000..b91129f81
--- /dev/null
+++ b/relnotes/v1.21.1.md
@@ -0,0 +1,5 @@
+### Bug fixes
+
+* [#452](https://github.com/rubocop/rubocop-performance/pull/452): Fix an error for `Performance/RedundantEqualityComparisonBlock` when the block is empty. ([@earlopain][])
+
+[@earlopain]: https://github.com/earlopain