diff --git a/.rubocop.yml b/.rubocop.yml
index 9828fc31..67bb54b3 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -8,7 +8,7 @@ AllCops:
   SuggestExtensions: false
   TargetRubyVersion: 2.6
 
-#- Pending Cops as of 1.66.1 ---------------------------------------------#
+#- Pending Cops as of 1.67.0 ---------------------------------------------#
 
 Gemspec/AddRuntimeDependency: # new in 1.65
   Enabled: true
@@ -40,6 +40,8 @@ Lint/DuplicateMatchPattern: # new in 1.50
   Enabled: true
 Lint/DuplicateRegexpCharacterClassElement: # (new in 1.1)
   Enabled: true
+Lint/DuplicateSetElement: # new in 1.67
+  Enabled: true
 Lint/EmptyBlock: # (new in 1.1)
   Enabled: true
 Lint/EmptyClass: # (new in 1.3)
diff --git a/CHANGELOG.md b/CHANGELOG.md
index aac9e22f..4bc410a8 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,4 +1,4 @@
-## Master
+## 0.15.3
 
 ##### Breaking
 
@@ -10,8 +10,8 @@
 
 ##### Bug Fixes
 
-* Don't crash when the Swift 6 compiler reports educational
-  notes.  
+* Don't crash in SourceKitten when the Swift 6 compiler reports
+  educational notes.  
   [John Fairhurst](https://github.com/johnfairh)
   [#1399](https://github.com/realm/jazzy/issues/1399)
 
diff --git a/Gemfile.lock b/Gemfile.lock
index b464235a..9543cb79 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -9,7 +9,7 @@ GIT
 PATH
   remote: .
   specs:
-    jazzy (0.15.2)
+    jazzy (0.15.3)
       cocoapods (~> 1.5)
       mustache (~> 1.1)
       open4 (~> 1.3)
@@ -27,7 +27,7 @@ GEM
       base64
       nkf
       rexml
-    activesupport (7.2.1)
+    activesupport (7.2.1.1)
       base64
       bigdecimal
       concurrent-ruby (~> 1.0, >= 1.3.1)
@@ -156,7 +156,7 @@ GEM
       uri
     netrc (0.11.0)
     nkf (0.2.0)
-    octokit (9.1.0)
+    octokit (9.2.0)
       faraday (>= 1, < 3)
       sawyer (~> 0.9)
     open4 (1.3.4)
@@ -173,9 +173,9 @@ GEM
     rchardet (1.8.0)
     redcarpet (3.6.0)
     regexp_parser (2.9.2)
-    rexml (3.3.7)
+    rexml (3.3.8)
     rouge (4.4.0)
-    rubocop (1.66.1)
+    rubocop (1.67.0)
       json (~> 2.3)
       language_server-protocol (>= 3.17.0)
       parallel (~> 1.10)
@@ -206,19 +206,19 @@ GEM
       concurrent-ruby (~> 1.0)
     unicode-display_width (2.6.0)
     uri (0.13.1)
-    webmock (3.23.1)
+    webmock (3.24.0)
       addressable (>= 2.8.0)
       crack (>= 0.3.2)
       hashdiff (>= 0.4.0, < 2.0.0)
     xcinvoke (0.3.0)
       liferaft (~> 0.0.6)
-    xcodeproj (1.25.0)
+    xcodeproj (1.25.1)
       CFPropertyList (>= 2.3.3, < 4.0)
       atomos (~> 0.1.3)
       claide (>= 1.0.2, < 2.0)
       colored2 (~> 3.1)
       nanaimo (~> 0.3.0)
-      rexml (>= 3.3.2, < 4.0)
+      rexml (>= 3.3.6, < 4.0)
 
 PLATFORMS
   ruby
diff --git a/lib/jazzy/gem_version.rb b/lib/jazzy/gem_version.rb
index 30b1eb49..86a6e4e6 100644
--- a/lib/jazzy/gem_version.rb
+++ b/lib/jazzy/gem_version.rb
@@ -1,5 +1,5 @@
 # frozen_string_literal: true
 
 module Jazzy
-  VERSION = '0.15.2' unless defined? Jazzy::VERSION
+  VERSION = '0.15.3' unless defined? Jazzy::VERSION
 end
diff --git a/lib/jazzy/source_declaration.rb b/lib/jazzy/source_declaration.rb
index 4fe2c720..2074f6f1 100644
--- a/lib/jazzy/source_declaration.rb
+++ b/lib/jazzy/source_declaration.rb
@@ -98,7 +98,7 @@ def objc_category_name
     end
 
     def swift_objc_extension?
-      type.swift_extension? && usr && usr.start_with?('c:objc')
+      type.swift_extension? && usr&.start_with?('c:objc')
     end
 
     def swift_extension_objc_name
diff --git a/lib/jazzy/sourcekitten.rb b/lib/jazzy/sourcekitten.rb
index 608dd610..11a060de 100644
--- a/lib/jazzy/sourcekitten.rb
+++ b/lib/jazzy/sourcekitten.rb
@@ -826,8 +826,7 @@ def self.reject_inaccessible_extensions(typedecl, extensions)
       # type itself, the type must be private and the extensions
       # should be rejected.
       if !typedecl &&
-         wanted_exts.first &&
-         wanted_exts.first.type_from_doc_module?
+         wanted_exts.first&.type_from_doc_module?
         unwanted_exts += wanted_exts
         wanted_exts = []
       end