diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0262a86d..ed31ec0c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -10,6 +10,7 @@
 * [#474](https://github.com/slack-ruby-client/pulls/474): Update API from [slack-api-ref@629967e](https://github.com/slack-ruby/slack-api-ref/commit/629967e) - [@slack-ruby-ci-bot](https://github.com/apps/slack-ruby-ci-bot).
 * [#475](https://github.com/slack-ruby-client/pulls/475): Update API from [slack-api-ref@977dad5](https://github.com/slack-ruby/slack-api-ref/commit/977dad5) - [@slack-ruby-ci-bot](https://github.com/apps/slack-ruby-ci-bot).
 * [#476](https://github.com/slack-ruby-client/pulls/476): Update API from [slack-api-ref@d0b2989](https://github.com/slack-ruby/slack-api-ref/commit/d0b2989) - [@slack-ruby-ci-bot](https://github.com/apps/slack-ruby-ci-bot).
+* [#478](https://github.com/slack-ruby-client/pulls/478): Update API from [slack-api-ref@d797055](https://github.com/slack-ruby/slack-api-ref/commit/d797055) - [@slack-ruby-ci-bot](https://github.com/apps/slack-ruby-ci-bot).
 * Your contribution here.
 
 ### 2.1.0 (2023/03/17)
diff --git a/bin/commands/calls.rb b/bin/commands/calls.rb
index f4d2d921..11e19ce4 100644
--- a/bin/commands/calls.rb
+++ b/bin/commands/calls.rb
@@ -12,7 +12,7 @@ class App
           c.flag 'external_unique_id', desc: 'An ID supplied by the 3rd-party Call provider. It must be unique across all Calls from that service.'
           c.flag 'join_url', desc: 'The URL required for a client to join the Call.'
           c.flag 'created_by', desc: 'The valid Slack user ID of the user who created this Call. When this method is called with a user token, the created_by field is optional and defaults to the authed user of the token. Otherwise, the field is required.'
-          c.flag 'date_start', desc: 'Call start time in UTC UNIX timestamp format.'
+          c.flag 'date_start', desc: 'Unix timestamp of the call start time.'
           c.flag 'desktop_app_join_url', desc: 'When supplied, available Slack clients will attempt to directly launch the 3rd-party Call with this URL.'
           c.flag 'external_display_id', desc: 'An optional, human-readable ID supplied by the 3rd-party Call provider. If supplied, this ID will be displayed in the Call object.'
           c.flag 'title', desc: 'The name of the Call.'
diff --git a/bin/commands/chat_scheduledMessages.rb b/bin/commands/chat_scheduledMessages.rb
index ddce74f7..9ed37cb6 100644
--- a/bin/commands/chat_scheduledMessages.rb
+++ b/bin/commands/chat_scheduledMessages.rb
@@ -11,9 +11,9 @@ class App
         g.command 'list' do |c|
           c.flag 'channel', desc: 'The channel of the scheduled messages.'
           c.flag 'cursor', desc: 'For pagination purposes, this is the cursor value returned from a previous call to chat.scheduledmessages.list indicating where you want to start this call from.'
-          c.flag 'latest', desc: 'A UNIX timestamp of the latest value in the time range.'
+          c.flag 'latest', desc: 'A Unix timestamp of the latest value in the time range.'
           c.flag 'limit', desc: 'Maximum number of original entries to return.'
-          c.flag 'oldest', desc: 'A UNIX timestamp of the oldest value in the time range.'
+          c.flag 'oldest', desc: 'A Unix timestamp of the oldest value in the time range.'
           c.flag 'team_id', desc: 'encoded team id to list channels in, required if org token is used.'
           c.action do |_global_options, options, _args|
             puts JSON.dump(@client.chat_scheduledMessages_list(options))
diff --git a/lib/slack/web/api/endpoints/calls.rb b/lib/slack/web/api/endpoints/calls.rb
index ef69335a..af857cae 100644
--- a/lib/slack/web/api/endpoints/calls.rb
+++ b/lib/slack/web/api/endpoints/calls.rb
@@ -16,7 +16,7 @@ module Calls
           # @option options [string] :created_by
           #   The valid Slack user ID of the user who created this Call. When this method is called with a user token, the created_by field is optional and defaults to the authed user of the token. Otherwise, the field is required.
           # @option options [integer] :date_start
-          #   Call start time in UTC UNIX timestamp format.
+          #   Unix timestamp of the call start time.
           # @option options [string] :desktop_app_join_url
           #   When supplied, available Slack clients will attempt to directly launch the 3rd-party Call with this URL.
           # @option options [string] :external_display_id
diff --git a/lib/slack/web/api/endpoints/chat_scheduledMessages.rb b/lib/slack/web/api/endpoints/chat_scheduledMessages.rb
index 7e2a7df7..b2f29a55 100644
--- a/lib/slack/web/api/endpoints/chat_scheduledMessages.rb
+++ b/lib/slack/web/api/endpoints/chat_scheduledMessages.rb
@@ -14,11 +14,11 @@ module ChatScheduledmessages
           # @option options [string] :cursor
           #   For pagination purposes, this is the cursor value returned from a previous call to chat.scheduledmessages.list indicating where you want to start this call from.
           # @option options [timestamp] :latest
-          #   A UNIX timestamp of the latest value in the time range.
+          #   A Unix timestamp of the latest value in the time range.
           # @option options [integer] :limit
           #   Maximum number of original entries to return.
           # @option options [timestamp] :oldest
-          #   A UNIX timestamp of the oldest value in the time range.
+          #   A Unix timestamp of the oldest value in the time range.
           # @option options [string] :team_id
           #   encoded team id to list channels in, required if org token is used.
           # @see https://api.slack.com/methods/chat.scheduledMessages.list
diff --git a/lib/slack/web/api/errors.rb b/lib/slack/web/api/errors.rb
index 9be897c9..9d75e038 100644
--- a/lib/slack/web/api/errors.rb
+++ b/lib/slack/web/api/errors.rb
@@ -78,6 +78,7 @@ class CannotMoveLocalChannel < SlackError; end
         class CannotParse < SlackError; end
         class CannotParseAttachment < SlackError; end
         class CannotPrompt < SlackError; end
+        class CannotReplyToMessage < SlackError; end
         class CannotResetBot < SlackError; end
         class CannotResetPrimaryOwner < SlackError; end
         class CannotResolveAlias < SlackError; end
@@ -678,6 +679,7 @@ class WorkflowsExportCsvNotEnabled < SlackError; end
           'cannot_parse' => CannotParse,
           'cannot_parse_attachment' => CannotParseAttachment,
           'cannot_prompt' => CannotPrompt,
+          'cannot_reply_to_message' => CannotReplyToMessage,
           'cannot_reset_bot' => CannotResetBot,
           'cannot_reset_primary_owner' => CannotResetPrimaryOwner,
           'cannot_resolve_alias' => CannotResolveAlias,
diff --git a/lib/slack/web/api/slack-api-ref b/lib/slack/web/api/slack-api-ref
index d7970554..7c22d0bf 160000
--- a/lib/slack/web/api/slack-api-ref
+++ b/lib/slack/web/api/slack-api-ref
@@ -1 +1 @@
-Subproject commit d7970554b32869a586921e7072b64ec37ee47092
+Subproject commit 7c22d0bf9325184ea40cfd4651aa9d6e67176d40