diff --git a/generated/google/apis/youtube_v3.rb b/generated/google/apis/youtube_v3.rb
index afbf00de9..06182a6e0 100644
--- a/generated/google/apis/youtube_v3.rb
+++ b/generated/google/apis/youtube_v3.rb
@@ -26,7 +26,7 @@ module Google
     # @see https://developers.google.com/youtube/
     module YoutubeV3
       VERSION = 'V3'
-      REVISION = '20201202'
+      REVISION = '20201214'
 
       # Manage your YouTube account
       AUTH_YOUTUBE = 'https://www.googleapis.com/auth/youtube'
diff --git a/generated/google/apis/youtube_v3/classes.rb b/generated/google/apis/youtube_v3/classes.rb
index d14854726..000d642a2 100644
--- a/generated/google/apis/youtube_v3/classes.rb
+++ b/generated/google/apis/youtube_v3/classes.rb
@@ -7215,7 +7215,15 @@ module Google
         # @return [Google::Apis::YoutubeV3::VideoProcessingDetails]
         attr_accessor :processing_details
       
-        # Project specific details about the content of a YouTube Video.
+        # DEPRECATED. b/157517979: This part was never populated after it was added.
+        # However, it sees non-zero traffic because there is generated client code in
+        # the wild that refers to it [1]. We keep this field and do NOT remove it
+        # because otherwise V3 would return an error when this part gets requested [2]. [
+        # 1] https://developers.google.com/resources/api-libraries/documentation/youtube/
+        # v3/csharp/latest/
+        # classGoogle_1_1Apis_1_1YouTube_1_1v3_1_1Data_1_1VideoProjectDetails.html [2]
+        # http://google3/video/youtube/src/python/servers/data_api/common.py?l=1565-1569&
+        # rcl=344141677
         # Corresponds to the JSON property `projectDetails`
         # @return [Google::Apis::YoutubeV3::VideoProjectDetails]
         attr_accessor :project_details
@@ -8265,22 +8273,24 @@ module Google
         end
       end
       
-      # Project specific details about the content of a YouTube Video.
+      # DEPRECATED. b/157517979: This part was never populated after it was added.
+      # However, it sees non-zero traffic because there is generated client code in
+      # the wild that refers to it [1]. We keep this field and do NOT remove it
+      # because otherwise V3 would return an error when this part gets requested [2]. [
+      # 1] https://developers.google.com/resources/api-libraries/documentation/youtube/
+      # v3/csharp/latest/
+      # classGoogle_1_1Apis_1_1YouTube_1_1v3_1_1Data_1_1VideoProjectDetails.html [2]
+      # http://google3/video/youtube/src/python/servers/data_api/common.py?l=1565-1569&
+      # rcl=344141677
       class VideoProjectDetails
         include Google::Apis::Core::Hashable
       
-        # A list of project tags associated with the video during the upload.
-        # Corresponds to the JSON property `tags`
-        # @return [Array<String>]
-        attr_accessor :tags
-      
         def initialize(**args)
            update!(**args)
         end
       
         # Update properties of this object
         def update!(**args)
-          @tags = args[:tags] if args.key?(:tags)
         end
       end
       
diff --git a/generated/google/apis/youtube_v3/representations.rb b/generated/google/apis/youtube_v3/representations.rb
index b1e5b5881..9cb400fd6 100644
--- a/generated/google/apis/youtube_v3/representations.rb
+++ b/generated/google/apis/youtube_v3/representations.rb
@@ -3288,7 +3288,6 @@ module Google
       class VideoProjectDetails
         # @private
         class Representation < Google::Apis::Core::JsonRepresentation
-          collection :tags, as: 'tags'
         end
       end
       
diff --git a/generated/google/apis/youtube_v3/synth.metadata b/generated/google/apis/youtube_v3/synth.metadata
index b6a63dc38..03c077969 100644
--- a/generated/google/apis/youtube_v3/synth.metadata
+++ b/generated/google/apis/youtube_v3/synth.metadata
@@ -4,7 +4,7 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/google-api-ruby-client.git",
-        "sha": "a292c4573b5fbe486f03f257d61ef902d46d167b"
+        "sha": "df6fc41c81fdeb3fc81ade23418af8f8351084b0"
       }
     }
   ]