diff --git a/CHANGELOG.md b/CHANGELOG.md
index 033aee18c..d0ad1c8ba 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,8 @@
 
 ## master (unreleased)
 
+## 1.31.1 (2024-03-01)
+
 ### Changes
 
 * [#282](https://github.com/rubocop/rubocop-ast/issues/282): Remove Prism from runtime dependency. ([@koic][])
diff --git a/docs/antora.yml b/docs/antora.yml
index 6c5a3e120..e47fb3755 100644
--- a/docs/antora.yml
+++ b/docs/antora.yml
@@ -1,5 +1,5 @@
 name: rubocop-ast
 title: RuboCop AST
-version: master
+version: '1.31'
 nav:
   - modules/ROOT/nav.adoc
diff --git a/lib/rubocop/ast/version.rb b/lib/rubocop/ast/version.rb
index 2b87a1ea5..512faa3a9 100644
--- a/lib/rubocop/ast/version.rb
+++ b/lib/rubocop/ast/version.rb
@@ -3,7 +3,7 @@
 module RuboCop
   module AST
     module Version
-      STRING = '1.31.0'
+      STRING = '1.31.1'
     end
   end
 end