diff --git a/CHANGELOG.md b/CHANGELOG.md
index c6b8e784..b7f18ab9 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,19 @@
 # sqlite3-ruby Changelog
 
+## 1.6.6 / 2023-09-12
+
+### Dependencies
+
+Vendored sqlite is updated to [v3.43.1](https://sqlite.org/releaselog/3_43_1.html).
+
+Upstream release notes:
+
+> - Fix a regression in the way that the [sum()](https://sqlite.org/lang_aggfunc.html#sumunc), [avg()](https://sqlite.org/lang_aggfunc.html#avg), and [total()](https://sqlite.org/lang_aggfunc.html#sumunc) aggregate functions handle infinities.
+> - Fix a bug in the [json_array_length()](https://sqlite.org/json1.html#jarraylen) function that occurs when the argument comes directly from [json_remove()](https://sqlite.org/json1.html#jrm).
+> - Fix the omit-unused-subquery-columns optimization (introduced in in version 3.42.0) so that it works correctly if the subquery is a compound where one arm is DISTINCT and the other is not.
+> - Other minor fixes.
+
+
 ## 1.6.5 / 2023-09-08
 
 ### Packaging
diff --git a/lib/sqlite3/version.rb b/lib/sqlite3/version.rb
index fb7779c9..4647aa8a 100644
--- a/lib/sqlite3/version.rb
+++ b/lib/sqlite3/version.rb
@@ -1,11 +1,11 @@
 module SQLite3
 
-  VERSION = "1.6.5"
+  VERSION = "1.6.6"
 
   module VersionProxy
     MAJOR = 1
     MINOR = 6
-    TINY  = 5
+    TINY  = 6
     BUILD = nil
 
     STRING = [ MAJOR, MINOR, TINY, BUILD ].compact.join( "." )