diff --git a/CHANGELOG.md b/CHANGELOG.md
index c2343dfa9..82f628d42 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -11,6 +11,8 @@
 
 ## master (unreleased)
 
+## 1.20.1 (2023-12-25)
+
 ### Bug fixes
 
 * [#428](https://github.com/rubocop/rubocop-performance/pull/428): Fix false negatives for `Performance/StringIdentifierArgument` when using multiple string arguments. ([@koic][])
diff --git a/docs/antora.yml b/docs/antora.yml
index 21b1815a3..186bc944d 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: '1.20'
 nav:
   - modules/ROOT/nav.adoc
diff --git a/docs/modules/ROOT/pages/cops_performance.adoc b/docs/modules/ROOT/pages/cops_performance.adoc
index d25ab7891..08be172b3 100644
--- a/docs/modules/ROOT/pages/cops_performance.adoc
+++ b/docs/modules/ROOT/pages/cops_performance.adoc
@@ -1,3 +1,9 @@
+////
+  Do NOT edit this file by hand directly, as it is automatically generated.
+
+  Please make any necessary changes to the cop documentation within the source files themselves.
+////
+
 = Performance
 
 == Performance/AncestorsInclude
diff --git a/lib/rubocop/performance/version.rb b/lib/rubocop/performance/version.rb
index 567e69737..12755a511 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 = '1.20.0'
+      STRING = '1.20.1'
 
       def self.document_version
         STRING.match('\d+\.\d+').to_s
diff --git a/relnotes/v1.20.1.md b/relnotes/v1.20.1.md
new file mode 100644
index 000000000..7012a54b8
--- /dev/null
+++ b/relnotes/v1.20.1.md
@@ -0,0 +1,5 @@
+### Bug fixes
+
+* [#428](https://github.com/rubocop/rubocop-performance/pull/428): Fix false negatives for `Performance/StringIdentifierArgument` when using multiple string arguments. ([@koic][])
+
+[@koic]: https://github.com/koic