The The Sims 4 September 2026 Update is now available, bringing one of the game’s larger quality-of-life patches of the year. Released on September 22, 2026, the update is available across PC, Mac, PlayStation, and Xbox. On PC, the game is updated to Patch 1.128.90.1030, while Mac players receive version 1.128.90.1230 and console players receive version 2.39. Along with new free content for children and toddlers, the September patch focuses heavily on Sim autonomy, relationship behavior, game stability, and a long list of bug fixes.
For players who have been dealing with Sims behaving strangely, getting stuck in interactions, choosing inconvenient objects, dancing too often, or experiencing crashes, this update is particularly important. The Sims Team describes it as a Quality of Life update influenced by feedback from EA Forums, Reddit, Discord Developer Q&As, and other player reports. The patch also includes more than 95 fixes and improvements across the Base Game and multiple expansion packs.
The Sims 4 September 2026 Patch: Version Numbers
The September 2026 update has different version numbers depending on the platform. PC players receive The Sims 4 Patch 1.128.90.1030, while Mac players receive 1.128.90.1230. On PlayStation and Xbox, the update is listed as Version 2.39.
The update is available through the EA App, Steam, and Epic Games on PC, as well as the supported console platforms. Players with automatic updates enabled should receive the patch automatically, although it is still a good idea to check for updates before starting an important save.
As with major Sims 4 patches, players who use Custom Content or gameplay mods should be careful before loading their main save. The September update includes changes to the game’s systems, and the development team specifically reported that an outdated mod was connected to one of the major automated crash reports investigated during development.
Free New Kids and Toddlers Content
One of the most visible additions in the September 2026 update is a new collection of free Base Game content designed around children and toddlers.
The update adds eight Build/Buy objects, giving players more options for bedrooms, playrooms, creative spaces, and family homes. New objects include The Crayon Chronicle, the “Look What I Made!” Frame, Family Game Night Favorites, the Junior Artist’s Paint Palette, the Make-Believe Wall Mural, the Bright Blocks Playroom Chair, the Bright Blocks Playroom Table, and the Dino Dive Tank aquarium.
These additions are especially useful for players who enjoy building family homes in The Sims 4. Instead of treating children’s rooms as simple bedrooms, the new objects make it easier to create dedicated homework corners, creative areas, playrooms, and personalized spaces.
The Dino Dive Tank is particularly noticeable because it can become a fun decorative centerpiece for a child’s bedroom or playroom. The new furniture and clutter pieces also provide additional opportunities for storytelling, allowing builders to make children’s spaces look more lived-in rather than relying on older Base Game objects.
New Create a Sim Items for Kids
The September 2026 patch also expands Create a Sim with several new clothing and hair options.
Children receive a new sweatshirt, polo shirt, khaki shorts, sequin top, ruffled blouse, and jeans with lace detail. There is also a new ponytail hairstyle with bangs specifically for children. In addition, four adult hairstyles have been converted for child Sims, including Messy Bangs, Afro Part, Long Braids, and Ombre Long Braids.
Toddlers receive three additional CAS items: a T-shirt, colorful glasses, and a denim dress.
The new CAS content fits naturally with the children’s Build/Buy additions, making the September update useful for players who enjoy creating complete family stories. You can now refresh both a child’s appearance and their bedroom without purchasing an additional pack.
A New Styled Room and Gallery Household
The free content is not limited to individual objects. The September update also introduces a new Styled Room, six new kid-focused Styled Looks, and a new household available through the Maxis Gallery account.
The Gallery additions include seven new Sims: four children, two toddlers, and an elder character who can become part of a family story in different ways.
This is a useful addition for players who want to explore the new content immediately rather than spending time creating a household from scratch. Builders can also use the new Styled Room as inspiration for their own children’s bedrooms and play areas.
The Biggest Change: Improved Sim Autonomy
The main focus of the The Sims 4 September 2026 Update is not actually the new furniture or CAS content. It is Sim autonomy.
The Sims Team has made dozens of adjustments intended to make Sims choose more sensible actions during everyday gameplay. Several of these changes address long-running player complaints about Sims ignoring nearby objects, repeating certain actions, or behaving in ways that do not match their preferences.
One of the most noticeable changes is that Sims will now face each other during conversations. This small adjustment can make social interactions feel more natural, particularly when Sims are talking in groups or standing in different parts of a room.
Another practical change concerns sinks. Sims will now use a sink in the same bathroom as the toilet instead of unnecessarily walking to another sink, such as one located in the kitchen. For players who build larger houses, this should make everyday routing feel more logical.
The update also changes how Sims with low Energy behave. They should no longer randomly wake up and start performing actions to increase Hygiene, Fun, or Social needs when they are supposed to be resting.
Phone, Gardening and Everyday Autonomy Fixes
The September patch includes several smaller autonomy changes that could make a noticeable difference during normal gameplay.
Sims who have the Dislike Phones preference will no longer autonomously perform the Browse Phone idle. Sims who dislike Gardening will also stop autonomously choosing gardening activities.
Children should no longer repeatedly use swings back-to-back, while Sims performing Push Ups now have a chance of failing the interaction. The failure is more likely when their Fitness skill is low or their Hunger or Energy needs are too low.
The update also changes Everyday Outfit selection. Sims can now choose from multiple Everyday Outfit options instead of repeatedly selecting only the first outfit in the category.
There are additional improvements to world collectibles and environmental objects. Rocks, Dig Sites, Frog Logs, and Wild Plants will now respawn when the Sim is not currently on the active lot.
The Sims 4 September 2026 Update Fixes Excessive Dancing
If your Sims have been dancing far more often than you wanted, the September patch addresses several related problems.
Stereos could previously cause Sims to repeatedly add dancing interactions to their queues. The September update addresses this behavior, although the fix is not retroactive for every existing save. EA notes that replacing an affected stereo in an old save may resolve the issue.
Sims will also no longer autonomously queue the Dance interaction while painting.
Another important change affects Sims who dislike dancing. They will no longer autonomously start dancing, and they should stop dancing if a song they dislike begins playing while they are already dancing.
The update also adds a cooldown to the Serenade interaction, reducing how frequently Sims can autonomously perform it.
Relationship and Family Dynamics Changes
Players using Growing Together and Lovestruck should notice several changes after installing the September patch.
Family Dynamics have been rebalanced so that some dynamics do not appear too frequently, while rarer dynamics have more opportunities to occur. This should create more variation in family relationships over time.
The update also changes Relationship Satisfaction from Lovestruck. Relationship decay has been significantly reduced, meaning relationships should not deteriorate as quickly under the affected systems.
These changes are part of the broader attempt to make autonomous relationship behavior feel less repetitive and more consistent with how players expect their Sims’ relationships to develop.
Infants and University Fixes
The September 2026 patch also addresses several problems affecting infants.
Some infants could appear on top of one another or unexpectedly pop out of their Playmat or Crib after a lot or save was reloaded. The update addresses these problems and also fixes situations where certain infant interactions could be canceled or blocked.
Discover University receives a separate fix involving rotational gameplay. Degree checks can now properly account for Sims who are outside the currently active household.
These may sound like smaller changes compared with the autonomy improvements, but they can matter considerably in rotational saves where multiple households, university students, and family members are being managed over long periods.
Major Stability and Crash Fixes
Another major part of Sims 4 Patch 1.128.90.1030 is stability.
The Sims Team investigated several crash reports and identified different causes across PC, Mac, and console versions. One of the most important findings involved outdated mod files that were corrupting memory for some players. This is why mod users should take extra care when updating the game.
On Mac, the update fixes a rare rendering problem that could cause a crash during extended play sessions.
Console players receive a change to gamepad directionality that addresses a crash affecting a significant number of players.
Base Game stability fixes include crashes related to rendering Sim models in CAS or Live Mode, SimService, path-planning, transitions from Build Mode to Manage Worlds, swimming pools built inside contour walls, particle effects, and entering Create a Sim from the Simology Panel.
The team also fixed a crash that could occur when many visual effects were displayed simultaneously, including situations involving multiple occult Sims.
Build Mode and Save Improvements
Builders will also find a few useful fixes in the September update.
The team improved roof trim behavior so nearby geometry does not incorrectly clip or invalidate trim segments. The change specifically addresses visual problems involving platforms or half walls placed close to roofs with inward-facing eaves.
There are also improvements to saving and autosave behavior.
Using Save and Exit, or saving and then exiting to the Main Menu, should no longer incorrectly create a new save file in the EA Documents folder instead of a versioned save attached to the original save.
Another fix addresses situations where restoring an Autosave and then manually saving could create an unnamed save or overwrite the wrong save slot.
For players who use Save Reminder and Real Time Autosave settings, their countdown timers will now reset independently instead of affecting one another.
Other Notable Fixes
The September 2026 update contains many additional fixes across the Base Game and expansion packs.
In City Living, NPC Sims should no longer reset when using the Karaoke Machine during festivals.
In Get Famous, Sims should no longer obsessively admire Autographs.
For Seasons, Sims have been toned down when it comes to autonomously making Snow Angels, building Snowmen, and shoveling snow.
There is also a fix for married couples who could be reverted to the Partners relationship status when entering CAS through Custom Tattoo planning or Plan Outfits.
The Gallery also receives an accessibility improvement: the Showcase Item in Your Profile button is now accessible while playing with a controller or keyboard and mouse.
What This September Patch Means for Mods and CC
If you use Sims 4 Mods or Custom Content, do not assume everything will continue working normally after installing Patch 1.128.90.1030.
The Sims Team specifically identified outdated mod files as a cause connected to a major automated crash report during its investigation. That does not mean every mod is broken, but it is a strong reason to update gameplay mods and check creator announcements before restoring your normal Mods folder.
A safer approach is to back up your saves, temporarily remove outdated gameplay mods, launch the game, and test your saves carefully. Players should also avoid saving over important files while testing an unfamiliar mod setup.
Final Thoughts on The Sims 4 September 2026 Update
The The Sims 4 September 2026 Update is much more than a small content drop. Patch 1.128.90.1030 combines free children’s content with a broad collection of autonomy improvements, relationship adjustments, stability fixes, Build Mode corrections, save-system improvements, and bug fixes across the game.
The most noticeable gameplay changes are likely to come from improved Sim autonomy. Sims should make more sensible choices around conversations, sinks, phones, gardening, dancing, sleep, outfits, and other everyday activities. Meanwhile, players who have experienced freezing, interaction queues getting stuck, crashes, infant glitches, or save-related problems have several fixes to test.
The new children’s Build/Buy and CAS items are an additional bonus for Base Game players, especially anyone building family homes, children’s bedrooms, playrooms, or storytelling households.
If you are updating today, make sure your game is running Patch 1.128.90.1030 on PC, check your Mods and CC, and back up important saves before returning to your regular gameplay. With more than 95 fixes and improvements included in this release, the September 2026 patch is one of the more substantial quality-of-life updates for The Sims 4 this year.
