diff --git a/activerecord/CHANGELOG.md b/activerecord/CHANGELOG.md
index 50b97738f0..f993bdd5a2 100644
--- a/activerecord/CHANGELOG.md
+++ b/activerecord/CHANGELOG.md
@@ -1,3 +1,7 @@
+*   Remove `:connection_id` from the `sql.active_record` notification.
+
+    *Aaron Patterson*, *Rafael Mendonça França*
+
 *   The `:name` key will no longer be returned as part of `DatabaseConfig#configuration_hash`. Please use `DatabaseConfig#owner_name` instead.
 
     *Eileen M. Uchitelle*, *John Crepezzi*
diff --git a/activerecord/lib/active_record/connection_adapters/abstract_adapter.rb b/activerecord/lib/active_record/connection_adapters/abstract_adapter.rb
index 9c2b17be1b..b273566cdd 100644
--- a/activerecord/lib/active_record/connection_adapters/abstract_adapter.rb
+++ b/activerecord/lib/active_record/connection_adapters/abstract_adapter.rb
@@ -678,7 +678,6 @@ module ActiveRecord
             binds:             binds,
             type_casted_binds: type_casted_binds,
             statement_name:    statement_name,
-            connection_id:     object_id,
             connection:        self) do
             @lock.synchronize do
               yield
diff --git a/guides/source/active_support_instrumentation.md b/guides/source/active_support_instrumentation.md
index 5612de7f20..3ae214ae52 100644
--- a/guides/source/active_support_instrumentation.md
+++ b/guides/source/active_support_instrumentation.md
@@ -349,7 +349,6 @@ Active Record
 | -------------------- | ---------------------------------------- |
 | `:sql`               | SQL statement                            |
 | `:name`              | Name of the operation                    |
-| `:connection_id`     | Object ID of the connection object       |
 | `:connection`        | Connection object                        |
 | `:binds`             | Bind parameters                          |
 | `:type_casted_binds` | Typecasted bind parameters               |
@@ -362,7 +361,6 @@ INFO. The adapters will add their own data as well.
 {
   sql: "SELECT \"posts\".* FROM \"posts\" ",
   name: "Post Load",
-  connection_id: 70307250813140,
   connection: #<ActiveRecord::ConnectionAdapters::SQLite3Adapter:0x00007f9f7a838850>,
   binds: [#<ActiveModel::Attribute::WithCastValue:0x00007fe19d15dc00>],
   type_casted_binds: [11],