The following sets are ones we feel have the highest probability of retiring in the coming months. While LEGO may not officially release retirement dates BrickEconomy uses a number of methods to predict this.

Architecture

Theme / Subtheme Architecture / Skylines
Year 2016
Pieces 598
Expected retirement End of 2024 93.5%
21028 LEGO Architecture Skylines New York City
Retail $59.99
Available at retail
Retiring soon
Theme / Subtheme Architecture / Skylines
Year 2017
Pieces 468
Expected retirement End of 2024 93.8%
21034 LEGO Architecture Skylines London
Retail $39.99
Available at retail
Retiring soon
Theme / Subtheme Architecture / Landmark Series
Year 2018
Pieces 1,685
Expected retirement End of 2024 88.9%
21042 LEGO Architecture Statue of Liberty
Retail $119.99
Available at retail
Retiring soon
Theme / Subtheme Architecture / Landmark Series
Year 2021
Pieces 2,022
Expected retirement End of 2024 94.9%
21056 LEGO Architecture Taj Mahal
Retail $119.99
Available at retail
Retiring soon
Theme / Subtheme Architecture / Skylines
Year 2022
Pieces 827
Expected retirement End of 2024 96.9%
21057 LEGO Architecture Skylines Singapore
Retail $59.99
Available at retail
Retiring soon

Avatar

Theme Avatar
Year 2022
Pieces / Minifigs 572 / 2
Expected retirement End of 2024 88.5%
75572 LEGO Avatar Jake & Neytiri's First Banshee Flight
Retail $59.99
Available at retail
Retiring soon
Theme Avatar
Year 2022
Pieces / Minifigs 1,212 / 4
Expected retirement End of 2024 89.6%
75574 LEGO Avatar Toruk Makto & Tree of Souls
Retail $149.99
Available at retail
Retiring soon
Theme / Subtheme Avatar / The Way of Water
Year 2023
Pieces / Minifigs 761 / 3
Expected retirement End of 2024 97.4%
75579 LEGO Avatar The Way of Water Payakan the Tulkun & Crabsuit
Retail $99.99
Available at retail
Retiring soon
Theme / Subtheme Avatar / The Way of Water
Year 2023
Pieces / Minifigs 259 / 2
Expected retirement End of 2024 94.4%
75576 LEGO Avatar The Way of Water Skimwing Adventure
Retail $34.99
Available at retail
Retiring soon
Theme / Subtheme Avatar / The Way of Water
Year 2023
Pieces / Minifigs 179 / 2
Expected retirement End of 2024 93.4%
75575 LEGO Avatar The Way of Water Ilu Discovery
Retail $24.99
Available at retail
Retiring soon

BrickHeadz

Theme / Subtheme BrickHeadz / Star Wars
Year 2022
Pieces 260
Expected retirement End of 2024 89.6%
40547 LEGO BrickHeadz Star Wars Obi-Wan Kenobi and Darth Vader
Retail $19.99
Available at retail
Retiring soon
Theme / Subtheme BrickHeadz / Avatar
Year 2022
Pieces 246
Expected retirement End of 2024 96.4%
40554 LEGO BrickHeadz Jake Sully & his Avatar
Retail $19.99
Available at retail
Retiring soon
Theme / Subtheme BrickHeadz / Star Wars
Year 2023
Pieces 152
Expected retirement End of 2024 93.5%
40615 LEGO BrickHeadz Star Wars Tusken Raider
Retail $9.99
Available at retail
Retiring soon
Year 2023
Pieces 184
Expected retirement End of 2024 91.2%
40630 LEGO BrickHeadz The Lord of the Rings Frodo & Gollum
Retail $14.99
Available at retail
Retiring soon
Theme / Subtheme BrickHeadz / Disney
Year 2023
Pieces 320
Expected retirement End of 2024 89.6%
40620 LEGO BrickHeadz Disney Cruella & Maleficent
Retail $19.99
Available at retail
Retiring soon
Theme / Subtheme BrickHeadz / Wizarding World
Year 2023
Pieces 250
Expected retirement End of 2024 96.5%
40618 LEGO BrickHeadz Wizarding World Kingsley Shacklebolt & Nymphadora Tonks
Retail $19.99
Available at retail
Retiring soon
Theme / Subtheme BrickHeadz / Wizarding World
Year 2023
Pieces 262
Expected retirement End of 2024 95.5%
40617 LEGO BrickHeadz Wizarding World Draco Malfoy & Cedric Diggory
Retail $19.99
Available at retail
Retiring soon
Theme / Subtheme BrickHeadz / Wizarding World
Year 2023
Pieces 267
Expected retirement End of 2024 94.5%
40616 LEGO BrickHeadz Wizarding World Harry Potter & Cho Chang
Retail $19.99
Available at retail
Retiring soon

Classic

Theme Classic
Year 2018
Pieces 213
Expected retirement End of 2024 90.6%
10713 LEGO Creative Suitcase
Retail $19.99
Available at retail
Retiring soon

DC Comics Super Heroes

Year 2021
Pieces / Minifigs 2,049 / 2
Expected retirement End of 2024 92.1%
76240 LEGO The Dark Knight Trilogy Batmobile Tumbler
Retail $269.99
Available at retail
Retiring soon
Theme / Subtheme DC Comics Super Heroes / Batman
Year 2023
Pieces 275
Expected retirement End of 2024 96.2%
76259 LEGO Batman Construction Figure
Retail $29.99
Available at retail
Retiring soon
Year 2023
Pieces / Minifigs 3,981 / 7
Expected retirement End of 2024 89.3%
76252 LEGO Batman Returns Batcave – Shadow Box
Retail $399.99
Available at retail
Retiring soon

Disney

Theme / Subtheme Disney / Storybook Adventures
Year 2023
Pieces / Mini-doll figures 111 / 3
Expected retirement End of 2024 88.9%
43220 LEGO Disney Peter Pan & Wendy's Storybook Adventure
Retail $19.99
Available at retail
Retiring soon
Theme / Subtheme Disney / Storybook Adventures
Year 2023
Pieces / Mini-doll figures 134 / 3
Expected retirement End of 2024 88.9%
43213 LEGO Disney Storybook Adventures The Little Mermaid Story Book
Retail $19.99
Available at retail
Retiring soon
Theme / Subtheme Disney / The Little Mermaid
Year 2023
Pieces / Minifigs 1,808 / 5
Expected retirement End of 2024 90.8%
43225 LEGO Disney The Little Mermaid
Retail $159.99
Available at retail
Retiring soon

Education

Theme / Subtheme Education / Duplo
Year 2020
Pieces / Duplo figures 480 / 6
Expected retirement End of 2024 90.5%
45028 LEGO Education Duplo My XL World
Retail $239.95
Available at retail
Retiring soon

Exclusive

Theme Exclusive
Year 2023
Pieces / Minifigs 899 / 15
Expected retirement End of 2024 93.3%
40634 LEGO Icons of Play
Retail $99.99
Available at retail
Retiring soon

Friends

Theme Friends
Year 2023
Pieces / Mini-doll figures 203 / 2
Expected retirement End of 2024 89.9%
41754 LEGO Friends Leo's Room
Retail $19.99
Available at retail
Retiring soon
Theme Friends
Year 2023
Pieces / Mini-doll figures 431 / 3
Expected retirement End of 2024 88.9%
41751 LEGO Friends Skate Park
Retail $49.99
Available at retail
Retiring soon
Theme / Subtheme Friends / Houses
Year 2023
Pieces / Mini-doll figures 185 / 3
Expected retirement End of 2024 94.3%
41724 LEGO Friends Paisley's House
Retail $39.99
Available at retail
Retiring soon
Theme Friends
Year 2023
Pieces / Mini-doll figures 832 / 4
Expected retirement End of 2024 97.7%
41744 LEGO Friends Sports Center
Retail $94.99
Available at retail
Retiring soon

Ghostbusters

Year 2020
Pieces 2,352
Expected retirement End of 2024 93.8%
10274 LEGO Ghostbusters ECTO-1
Retail $239.99
Available at retail
Retiring soon

Harry Potter

Theme / Subtheme Harry Potter / Half-Blood Prince
Year 2020
Pieces / Minifigs 971 / 8
Expected retirement End of 2024 94.1%
75969 LEGO Harry Potter Half-Blood Prince Hogwarts Astronomy Tower
Retail $99.99
Available at retail
Retiring soon
Theme / Subtheme Harry Potter / Chamber of Secrets
Year 2021
Pieces / Minifigs 1,176 / 10
Expected retirement End of 2024 92.8%
76389 LEGO Harry Potter Hogwarts Chamber of Secrets
Retail $149.99
Available at retail
Retiring soon
Theme / Subtheme Harry Potter / Chamber of Secrets
Year 2022
Pieces / Minifigs 654 / 6
Expected retirement End of 2024 95.8%
76402 LEGO Harry Potter Chamber of Secrets Hogwarts Dumbledore's Office
Retail $79.99
Available at retail
Retiring soon
Year 2022
Pieces / Minifigs 777 / 6
Expected retirement End of 2024 94.8%
76407 LEGO Harry Potter Prisoner of Azkaban The Shrieking Shack & Whomping Willow
Retail $89.99
Available at retail
Retiring soon
Year 2022
Pieces / Minifigs 5,129 / 20
Expected retirement End of 2024 90.8%
76405 LEGO Harry Potter Hogwarts Express Collectors' Edition
Retail $499.99
Available at retail
Retiring soon
Year 2023
Pieces / Minifigs 587 / 5
Expected retirement End of 2024 96.5%
76413 LEGO Harry Potter Hogwarts Room of Requirement
Retail $49.99
Available at retail
Retiring soon
Year 2023
Pieces / Minifigs 599 / 4
Expected retirement End of 2024 96.7%
76416 LEGO Harry Potter Quidditch Trunk
Retail $64.99
Available at retail
Retiring soon
Theme / Subtheme Harry Potter / Deathly Hallows
Year 2023
Pieces / Minifigs 730 / 6
Expected retirement End of 2024 95.7%
76415 LEGO Harry Potter Deathly Hallows The Battle of Hogwarts
Retail $79.99
Available at retail
Retiring soon
Year 2023
Pieces / Minifigs 834 / 7
Expected retirement End of 2024 93.1%
76422 LEGO Harry Potter Diagon Alley Weasleys' Wizard Wheezes
Retail $89.99
Available at retail
Retiring soon
Year 2023
Pieces / Minifigs 754 / 2
Expected retirement End of 2024 92.1%
76414 LEGO Harry Potter Expecto Patronum
Retail $69.99
Available at retail
Retiring soon

Icons

Theme / Subtheme Icons / Space
Year 2021
Pieces 2,354
Expected retirement End of 2024 93.0%
10283 LEGO Space Shuttle Discovery
Retail $199.99
Available at retail
Retiring soon
Theme / Subtheme Icons / Fairground
Year 2022
Pieces / Minifigs 3,756 / 11
Expected retirement End of 2024 96.3%
10303 LEGO Loop Coaster
Retail $399.99
Available at retail
Retiring soon
Theme / Subtheme Icons / Licensed
Year 2022
Pieces / Minifigs 2,532 / 1
Expected retirement End of 2024 94.4%
10306 LEGO Atari 2600
Retail $239.99
Available at retail
Retiring soon
Theme / Subtheme Icons / Vehicles
Year 2022
Pieces 1,456
Expected retirement End of 2024 92.4%
10304 LEGO Chevrolet Camaro Z/28 1969
Retail $169.99
Available at retail
Retiring soon
Theme / Subtheme Icons / Winter Village
Year 2022
Pieces / Minifigs 1,514 / 6
Expected retirement End of 2024 90.6%
10308 LEGO Holiday Main Street
Retail $99.99
Available at retail
Retiring soon
Theme / Subtheme Icons / Botanical Collection
Year 2023
Pieces 812
Expected retirement End of 2024 93.1%
10314 LEGO Botanical Collection Dried Flower Centrepiece
Retail $49.99
Available at retail
Retiring soon
Theme / Subtheme Icons / Pirates System
Year 2023
Pieces / Minifigs 2,509 / 8
Expected retirement End of 2024 95.2%
10320 LEGO Pirates System Eldorado Fortress
Retail $214.99
Available at retail
Retiring soon

Ideas

Theme Ideas
Year 2019
Pieces / Minifigs 3,036 / 4
Expected retirement End of 2024 89.2%
21318 LEGO Ideas Treehouse
Retail $249.99
Available at retail
Retiring soon
Theme Ideas
Year 2021
Pieces 2,079
Expected retirement End of 2024 93.3%
21327 LEGO Ideas Typewriter
Retail $249.99
Available at retail
Retiring soon
Theme / Subtheme Ideas / Licensed
Year 2021
Pieces 1,074
Expected retirement End of 2024 89.4%
21329 LEGO Ideas Fender Stratocaster
Retail $119.99
Available at retail
Retiring soon
Theme / Subtheme Ideas / Licensed
Year 2022
Pieces / Minifigs 1,125 / 1
Expected retirement End of 2024 92.5%
21331 LEGO Ideas Sonic the Hedgehog - Green Hill Zone
Retail $79.99
Available at retail
Retiring soon
Theme Ideas
Year 2022
Pieces 2,585
Expected retirement End of 2024 96.0%
21332 LEGO Ideas The Globe
Retail $229.99
Available at retail
Retiring soon
Theme Ideas
Year 2022
Pieces 1,606
Expected retirement End of 2024 88.9%
21334 LEGO Ideas Jazz Quartet
Retail $99.99
Available at retail
Retiring soon
Theme Ideas
Year 2022
Pieces / Minifigs 1,164 / 15
Expected retirement End of 2024 88.4%
21336 LEGO Ideas The Office
Retail $119.99
Available at retail
Retiring soon
Theme Ideas
Year 2023
Pieces / Minifigs 2,082 / 4
Expected retirement End of 2024 89.5%
21338 LEGO Ideas A-Frame Cabin
Retail $179.99
Available at retail
Retiring soon
Theme / Subtheme Ideas / Licensed
Year 2023
Pieces / Minifigs 749 / 7
Expected retirement End of 2024 96.8%
21339 LEGO Ideas BTS Dynamite
Retail $99.99
Available at retail
Retiring soon

Jurassic World

Theme / Subtheme Jurassic World / Jurassic Park
Year 2023
Pieces / Minifigs 137 / 2
Expected retirement End of 2024 92.4%
76957 LEGO Jurassic World Jurassic Park Velociraptor Escape
Retail $39.99
Available at retail
Retiring soon

Marvel Super Heroes

Year 2022
Pieces / Minifigs 110 / 3
Expected retirement End of 2024 97.4%
10782 LEGO Spidey and His Amazing Friends Hulk vs. Rhino Truck Showdown
Retail $19.99
Available at retail
Retiring soon
Year 2022
Pieces 476
Expected retirement End of 2024 89.9%
76217 LEGO Guardians of the Galaxy Vol 2 I am Groot
Retail $54.99
Available at retail
Retiring soon
Year 2022
Pieces 675
Expected retirement End of 2024 93.3%
76223 LEGO Nano Gauntlet
Retail $69.99
Available at retail
Retiring soon
Year 2022
Pieces / Minifigs 2,708 / 9
Expected retirement End of 2024 89.9%
76218 LEGO Doctor Strange in the Multiverse of Madness Sanctum Sanctorum
Retail $249.99
Available at retail
Retiring soon
Theme / Subtheme Marvel Super Heroes / Spider-Man
Year 2022
Pieces 258
Expected retirement End of 2024 95.6%
76226 LEGO Spider-Man Figure
Retail $24.99
Available at retail
Retiring soon
Year 2022
Pieces / Minifigs 545 / 5
Expected retirement End of 2024 95.7%
76214 LEGO Black Panther Wakanda Forever Black Panther War on the Water
Retail $89.99
Available at retail
Retiring soon
Year 2022
Pieces / Minifigs 4,049 / 1
Expected retirement End of 2024 92.9%
76210 LEGO Age of Ultron Hulkbuster
Retail $549.99
Available at retail
Retiring soon
Theme / Subtheme Marvel Super Heroes / Avengers
Year 2023
Pieces / Minifigs 98 / 1
Expected retirement End of 2024 93.4%
76243 LEGO Avengers Rocket Mech Armor
Retail $14.99
Available at retail
Retiring soon
Theme / Subtheme Marvel Super Heroes / Avengers
Year 2023
Pieces / Minifigs 138 / 1
Expected retirement End of 2024 91.4%
76241 LEGO Avengers Hulk Mech Armor
Retail $14.99
Available at retail
Retiring soon
Year 2023
Pieces / Minifigs 385 / 4
Expected retirement End of 2024 89.3%
76247 LEGO Avengers Infinity War The Hulkbuster The Battle of Wakanda
Retail $49.99
Available at retail
Retiring soon
Theme / Subtheme Marvel Super Heroes / Avengers
Year 2023
Pieces / Minifigs 795 / 5
Expected retirement End of 2024 88.3%
76248 LEGO The Avengers Quinjet
Retail $99.99
Available at retail
Retiring soon
Theme / Subtheme Marvel Super Heroes / Mechs
Year 2023
Pieces / Minifigs 264 / 1
Expected retirement End of 2024 97.2%
76245 LEGO Ghost Rider Mech & Bike
Retail $34.99
Available at retail
Retiring soon
Theme / Subtheme Marvel Super Heroes / Spider-Man
Year 2023
Pieces / Minifigs 220 / 2
Expected retirement End of 2024 96.2%
76244 LEGO Spider-Man Miles Morales vs. Morbius
Retail $24.99
Available at retail
Retiring soon
Theme / Subtheme Marvel Super Heroes / Spider-Man
Year 2023
Pieces / Minifigs 187 / 5
Expected retirement End of 2024 92.0%
10791 LEGO Spider-Man Team Spidey's Mobile Headquarters
Retail $49.99
Available at retail
Retiring soon
Theme / Subtheme Marvel Super Heroes / Spider-Man
Year 2023
Pieces / Minifigs 48 / 2
Expected retirement End of 2024 90.0%
10789 LEGO Spider-Man's Car and Doc Ock
Retail $9.99
Available at retail
Retiring soon
Year 2023
Pieces / Minifigs 330 / 2
Expected retirement End of 2024 90.8%
76254 LEGO Guardians of the Galaxy Baby Rocket's Ship
Retail $34.99
Available at retail
Retiring soon
Year 2023
Pieces 602
Expected retirement End of 2024 97.6%
76251 LEGO Guardians of the Galaxy Star-Lord's Helmet
Retail $79.99
Available at retail
Retiring soon
Year 2023
Pieces / Minifigs 67 / 2
Expected retirement End of 2024 92.9%
76253 LEGO Guardians of the Galaxy Headquarters
Retail $9.99
Available at retail
Retiring soon
Theme / Subtheme Marvel Super Heroes / Ant-Man
Year 2023
Pieces / Minifigs 289 / 1
Expected retirement End of 2024 97.8%
76256 LEGO Ant-Man Construction Figure
Retail $29.99
Available at retail
Retiring soon
Year 2023
Pieces / Minifigs 130 / 2
Expected retirement End of 2024 94.7%
76260 LEGO Age of Ultron Black Widow & Captain America Motorcycles
Retail $14.99
Available at retail
Retiring soon
Theme / Subtheme Marvel Super Heroes / Avengers
Year 2023
Pieces 310
Expected retirement End of 2024 93.7%
76258 LEGO Avengers Captain America Construction Figure
Retail $29.99
Available at retail
Retiring soon
Theme / Subtheme Marvel Super Heroes / X-Men
Year 2023
Pieces 327
Expected retirement End of 2024 92.7%
76257 LEGO X-Men Wolverine Construction Figure
Retail $29.99
Available at retail
Retiring soon

Monkie Kid

Theme / Subtheme Monkie Kid / Season 3
Year 2022
Pieces / Minifigs 2,187 / 7
Expected retirement End of 2024 96.8%
80036 LEGO Monkie Kid Season 3 The City of Lanterns
Retail $159.99
Available at retail
Retiring soon

Ninjago

Theme / Subtheme Ninjago / Legacy
Year 2021
Pieces / Minifigs 5,685 / 19
Expected retirement End of 2024 96.9%
71741 LEGO Legacy NINJAGO City Gardens
Retail $349.99
Available at retail
Retiring soon
Theme / Subtheme Ninjago / Core
Year 2023
Pieces / Minifigs 285 / 2
Expected retirement End of 2024 92.3%
71782 LEGO Ninjago Core Cole's Earth Dragon EVO
Retail $34.99
Available at retail
Retiring soon

Seasonal

Theme / Subtheme Seasonal / Christmas
Year 2022
Pieces 784
Expected retirement End of 2024 92.7%
40573 LEGO Christmas Tree
Retail $44.99
Available at retail
Retiring soon

Star Wars

Theme / Subtheme Star Wars / The Rise of Skywalker
Year 2019
Pieces / Minifigs 1,351 / 7
Expected retirement End of 2024 90.7%
75257 LEGO Star Wars Millennium Falcon
Retail $169.99
Available at retail
Retiring soon
Theme / Subtheme Star Wars / Master Builder Series
Year 2020
Pieces / Minifigs 3,187 / 21
Expected retirement End of 2024 96.3%
75290 LEGO Star Wars Master Builder Series Mos Eisley Cantina
Retail $399.99
Available at retail
Retiring soon
Theme Star Wars
Year 2021
Pieces / Minifigs 2,314 / 1
Expected retirement End of 2024 95.9%
75308 LEGO Star Wars R2-D2
Retail $239.99
Available at retail
Retiring soon
Year 2021
Pieces / Minifigs 6,785 / 9
Expected retirement End of 2024 91.5%
75313 LEGO Star Wars AT-AT
Retail $849.99
Available at retail
Retiring soon
Year 2022
Pieces / Minifigs 1,890 / 2
Expected retirement End of 2024 89.2%
75341 LEGO Star Wars Luke Skywalker's Landspeeder
Retail $239.99
Available at retail
Retiring soon
Theme / Subtheme Star Wars / Microfighters
Year 2023
Pieces / Minifigs 85 / 1
Expected retirement End of 2024 94.6%
75344 LEGO Star Wars Boba Fett's Starship Microfighter
Retail $9.99
Available at retail
Retiring soon
Theme / Subtheme Star Wars / Helmet Collection
Year 2023
Pieces 766
Expected retirement End of 2024 94.5%
75350 LEGO Star Wars Helmet Collection Clone Commander Cody Helmet
Retail $69.99
Available at retail
Retiring soon
Theme / Subtheme Star Wars / Helmet Collection
Year 2023
Pieces 670
Expected retirement End of 2024 90.5%
75351 LEGO Star Wars Helmet Collection Princess Leia (Boushh) Helmet
Retail $69.99
Available at retail
Retiring soon
Theme / Subtheme Star Wars / The Mandalorian
Year 2023
Pieces / Minifigs 957 / 4
Expected retirement End of 2024 97.0%
75348 LEGO Star Wars The Mandalorian Fang Fighter vs TIE Interceptor
Retail $99.99
Available at retail
Retiring soon
Theme / Subtheme Star Wars / Diorama Collection
Year 2023
Pieces / Minifigs 608 / 3
Expected retirement End of 2024 92.8%
75353 LEGO Star Wars Endor Speeder Chase Diorama
Retail $79.99
Available at retail
Retiring soon
Theme / Subtheme Star Wars / Diorama Collection
Year 2023
Pieces / Minifigs 807 / 3
Expected retirement End of 2024 91.8%
75352 LEGO Star Wars Emperor's Throne Room Diorama
Retail $99.99
Available at retail
Retiring soon
Theme / Subtheme Star Wars / Young Jedi Adventures
Year 2023
Pieces / Minifigs 124 / 3
Expected retirement End of 2024 97.6%
75358 LEGO Star Wars Young Jedi Adventures Tenoo Jedi Temple
Retail $39.99
Available at retail
Retiring soon

Super Mario

Year 2020
Pieces / Figures 231 / 3
Expected retirement End of 2024 92.7%
71360 LEGO Super Mario Adventures with Mario
Retail $59.99
Available at retail
Retiring soon
Theme / Subtheme Super Mario / Miscellaneous
Year 2020
Pieces / Figures 2,646 / 1
Expected retirement End of 2024 92.0%
71374 LEGO Super Mario Nintendo Entertainment System
Retail $269.99
Available at retail
Retiring soon

Technic

Theme / Subtheme Technic / Monster Jam
Year 2023
Pieces 244
Expected retirement End of 2024 91.3%
42150 LEGO Technic Monster Jam Monster Mutt Dalmatian
Retail $19.99
Available at retail
Retiring soon
How is the estimated retirement determined?
Soon to be retiredIn most cases, LEGO does not release beforehand the exact date of a set's retirement. BrickEconomy uses a number of factors to do its best to predict this retirement date such as understating the 'Sold out' cycles of the different LEGO retail markets along with tracking the relative lifespan of similar sets, and, most importantly using a machine learning model to more accurately predict retirement. By utilizing all these factors a confidence score and estimated date is created and updated frequently.