diff --git a/CHANGELOG.md b/CHANGELOG.md
index 28aa5dd5..f30b93ad 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 # Change Log
 
+## 1.10.2
+
+- Fixed some types so set transformations are compatible with TypeSscript 5.5 once more.
+
 ## 1.10.1
 
 - Some more minor optimizations, for example creating models should be around 10% faster now.
diff --git a/apps/benchmark/package.json b/apps/benchmark/package.json
index 918d269c..386c3e6e 100644
--- a/apps/benchmark/package.json
+++ b/apps/benchmark/package.json
@@ -25,6 +25,6 @@
     "@types/benchmark": "^2.1.5",
     "cross-env": "^7.0.3",
     "shx": "^0.3.4",
-    "typescript": "^5.4.5"
+    "typescript": "^5.5.2"
   }
 }
diff --git a/apps/site/package.json b/apps/site/package.json
index e530a278..a34a67f4 100644
--- a/apps/site/package.json
+++ b/apps/site/package.json
@@ -41,7 +41,7 @@
     "@types/uuid": "^10.0.0",
     "raw-loader": "^4.0.2",
     "shx": "^0.3.4",
-    "typescript": "^5.4.5"
+    "typescript": "^5.5.2"
   },
   "browserslist": {
     "production": [
diff --git a/package.json b/package.json
index aaec2422..8cc2874e 100644
--- a/package.json
+++ b/package.json
@@ -41,7 +41,7 @@
     "prettier": "^3.3.2",
     "prettier-plugin-organize-imports": "^3.2.4",
     "turbo": "^2.0.4",
-    "typescript": "^5.4.5",
+    "typescript": "^5.5.2",
     "typescript-eslint": "^7.13.1"
   },
   "packageManager": "yarn@4.2.2"
diff --git a/packages/lib/package.json b/packages/lib/package.json
index 2e93d8a5..a9c53999 100755
--- a/packages/lib/package.json
+++ b/packages/lib/package.json
@@ -1,6 +1,6 @@
 {
   "name": "mobx-keystone",
-  "version": "1.10.1",
+  "version": "1.10.2",
   "description": "A MobX powered state management solution based on data trees with first class support for TypeScript, snapshots, patches and much more",
   "keywords": [
     "mobx",
@@ -86,7 +86,7 @@
     "ts-jest": "^29.1.5",
     "ts-node": "^10.9.2",
     "typedoc": "^0.26.0",
-    "typescript": "^5.4.5",
+    "typescript": "^5.5.2",
     "vite": "^5.3.1"
   },
   "dependencies": {
diff --git a/packages/lib/src/transforms/asSet.ts b/packages/lib/src/transforms/asSet.ts
index 7031eb2c..6627b6c6 100644
--- a/packages/lib/src/transforms/asSet.ts
+++ b/packages/lib/src/transforms/asSet.ts
@@ -1,7 +1,8 @@
+import { ObservableSet } from "mobx"
 import type { ModelPropTransform } from "../modelShared/prop"
 import { asSet } from "../wrappers/asSet"
 
-const _arrayToSetTransform: ModelPropTransform<Array<unknown>, Set<unknown>> = {
+const _arrayToSetTransform: ModelPropTransform<Array<unknown>, ObservableSet<unknown>> = {
   transform({ originalValue: arr, cachedTransformedValue: cachedSet }) {
     return cachedSet ?? asSet(arr)
   },
@@ -14,4 +15,4 @@ const _arrayToSetTransform: ModelPropTransform<Array<unknown>, Set<unknown>> = {
 }
 
 export const arrayToSetTransform = <T>() =>
-  _arrayToSetTransform as ModelPropTransform<Array<T>, Set<T>>
+  _arrayToSetTransform as ModelPropTransform<Array<T>, Set<T> | ObservableSet<T>>
diff --git a/packages/lib/src/utils/index.ts b/packages/lib/src/utils/index.ts
index 98b5f504..9c43694f 100644
--- a/packages/lib/src/utils/index.ts
+++ b/packages/lib/src/utils/index.ts
@@ -196,7 +196,10 @@ export function assertIsObservableArray(
 /**
  * @internal
  */
-export function assertIsMap(value: unknown, argName: string): asserts value is Map<any, any> {
+export function assertIsMap(
+  value: unknown,
+  argName: string
+): asserts value is Map<any, any> | ObservableMap {
   if (!isMap(value)) {
     throw failure(`${argName} must be a map`)
   }
@@ -205,7 +208,10 @@ export function assertIsMap(value: unknown, argName: string): asserts value is M
 /**
  * @internal
  */
-export function assertIsSet(value: unknown, argName: string): asserts value is Set<any> {
+export function assertIsSet(
+  value: unknown,
+  argName: string
+): asserts value is Set<any> | ObservableSet {
   if (!isSet(value)) {
     throw failure(`${argName} must be a set`)
   }
diff --git a/packages/lib/src/wrappers/ArraySet.ts b/packages/lib/src/wrappers/ArraySet.ts
index 4e7c2416..e908e1b3 100644
--- a/packages/lib/src/wrappers/ArraySet.ts
+++ b/packages/lib/src/wrappers/ArraySet.ts
@@ -89,6 +89,41 @@ export class ArraySet<V>
   }
 
   readonly [Symbol.toStringTag] = "ArraySet"
+
+  union<U>(other: ReadonlySetLike<U>): Set<V | U> {
+    const s = new Set(this)
+    return s.union(other)
+  }
+
+  intersection<U>(other: ReadonlySetLike<U>): Set<V & U> {
+    const s = new Set(this)
+    return s.intersection(other)
+  }
+
+  difference<U>(other: ReadonlySetLike<U>): Set<V> {
+    const s = new Set(this)
+    return s.difference(other)
+  }
+
+  symmetricDifference<U>(other: ReadonlySetLike<U>): Set<V | U> {
+    const s = new Set(this)
+    return s.symmetricDifference(other)
+  }
+
+  isSubsetOf(other: ReadonlySetLike<unknown>): boolean {
+    const s = new Set(this)
+    return s.isSubsetOf(other)
+  }
+
+  isSupersetOf(other: ReadonlySetLike<unknown>): boolean {
+    const s = new Set(this)
+    return s.isSupersetOf(other)
+  }
+
+  isDisjointFrom(other: ReadonlySetLike<unknown>): boolean {
+    const s = new Set(this)
+    return s.isDisjointFrom(other)
+  }
 }
 
 /**
diff --git a/packages/lib/src/wrappers/asSet.ts b/packages/lib/src/wrappers/asSet.ts
index d36cb125..aa62206b 100644
--- a/packages/lib/src/wrappers/asSet.ts
+++ b/packages/lib/src/wrappers/asSet.ts
@@ -146,7 +146,7 @@ export function asSet<T>(array: Array<T>): ObservableSet<T> & { dataObject: type
  *
  * @param set
  */
-export function setToArray<T>(set: Set<T>): Array<T> {
+export function setToArray<T>(set: Set<T> | ObservableSet<T>): Array<T> {
   assertIsSet(set, "set")
 
   const dataObject = (set as Set<T> & { dataObject: Array<T> }).dataObject
diff --git a/packages/lib/test/model/propTransform.test.ts b/packages/lib/test/model/propTransform.test.ts
index c60d0a12..5f0075ba 100644
--- a/packages/lib/test/model/propTransform.test.ts
+++ b/packages/lib/test/model/propTransform.test.ts
@@ -1,4 +1,4 @@
-import { set, toJS } from "mobx"
+import { ObservableSet, set, toJS } from "mobx"
 import { assert, _ } from "spec.ts"
 import {
   arrayToMapTransform,
@@ -309,7 +309,7 @@ test("prop with arr->set transform", () => {
     set: set1,
   })
 
-  assert(t.set, _ as Set<number>)
+  assert(t.set, _ as Set<number> | ObservableSet<number>)
   expect(t.set.has(1)).toBe(true)
   expect(t.set).not.toBe(set1) // should not be cached
   expect(t.set).toBe(t.set) // should be cached
@@ -331,7 +331,7 @@ test("prop with arr->set transform", () => {
 
   t.setSet(set2)
 
-  assert(t.set, _ as Set<number>)
+  assert(t.set, _ as Set<number> | ObservableSet<number>)
   expect(t.set.has(2)).toBe(true)
   expect(t.set).not.toBe(set2) // should not be cached
   expect(t.set).toBe(t.set) // should be cached
@@ -340,7 +340,7 @@ test("prop with arr->set transform", () => {
   const tsn = getSnapshot(t)
   assert(tsn.set, _ as Array<number>)
   const tfsn = fromSnapshot(T, tsn)
-  assert(tfsn.set, _ as Set<number>)
+  assert(tfsn.set, _ as Set<number> | ObservableSet<number>)
   expect(toJS(t.$.set)).toEqual([2])
 
   t.setNumberArr([4])
diff --git a/packages/mobx-keystone-yjs/package.json b/packages/mobx-keystone-yjs/package.json
index aad9b3bf..1d680c21 100644
--- a/packages/mobx-keystone-yjs/package.json
+++ b/packages/mobx-keystone-yjs/package.json
@@ -79,7 +79,7 @@
     "spec.ts": "^1.1.3",
     "ts-jest": "^29.1.5",
     "ts-node": "^10.9.2",
-    "typescript": "^5.4.5",
+    "typescript": "^5.5.2",
     "vite": "^5.3.1"
   },
   "dependencies": {
diff --git a/yarn.lock b/yarn.lock
index 52128037..0f5a1c4b 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -7493,7 +7493,7 @@ __metadata:
     mobx-state-tree: "npm:^6.0.0"
     shx: "npm:^0.3.4"
     tslib: "npm:^2.6.3"
-    typescript: "npm:^5.4.5"
+    typescript: "npm:^5.5.2"
   peerDependencies:
     mobx: ^6.0.0
   languageName: unknown
@@ -16375,7 +16375,7 @@ __metadata:
     ts-jest: "npm:^29.1.5"
     ts-node: "npm:^10.9.2"
     tslib: "npm:^2.6.3"
-    typescript: "npm:^5.4.5"
+    typescript: "npm:^5.5.2"
     vite: "npm:^5.3.1"
   peerDependencies:
     mobx: ^6.0.0 || ^5.0.0 || ^4.0.0
@@ -16411,7 +16411,7 @@ __metadata:
     ts-toolbelt: "npm:^9.6.0"
     tslib: "npm:^2.6.3"
     typedoc: "npm:^0.26.0"
-    typescript: "npm:^5.4.5"
+    typescript: "npm:^5.5.2"
     vite: "npm:^5.3.1"
   peerDependencies:
     mobx: ^6.0.0 || ^5.0.0 || ^4.0.0
@@ -19868,7 +19868,7 @@ __metadata:
     prettier: "npm:^3.3.2"
     prettier-plugin-organize-imports: "npm:^3.2.4"
     turbo: "npm:^2.0.4"
-    typescript: "npm:^5.4.5"
+    typescript: "npm:^5.5.2"
     typescript-eslint: "npm:^7.13.1"
     yjs: "npm:^13.6.18"
   languageName: unknown
@@ -20469,7 +20469,7 @@ __metadata:
     react-dom: "npm:^18.3.1"
     remotedev: "npm:^0.2.9"
     shx: "npm:^0.3.4"
-    typescript: "npm:^5.4.5"
+    typescript: "npm:^5.5.2"
     utf-8-validate: "npm:^5.0.10"
     y-webrtc: "npm:^10.3.0"
   peerDependencies:
@@ -22023,23 +22023,23 @@ __metadata:
   languageName: node
   linkType: hard
 
-"typescript@npm:^5.0.0, typescript@npm:^5.0.4, typescript@npm:^5.4.5":
-  version: 5.4.5
-  resolution: "typescript@npm:5.4.5"
+"typescript@npm:^5.0.0, typescript@npm:^5.0.4, typescript@npm:^5.5.2":
+  version: 5.5.2
+  resolution: "typescript@npm:5.5.2"
   bin:
     tsc: bin/tsc
     tsserver: bin/tsserver
-  checksum: 10c0/2954022ada340fd3d6a9e2b8e534f65d57c92d5f3989a263754a78aba549f7e6529acc1921913560a4b816c46dce7df4a4d29f9f11a3dc0d4213bb76d043251e
+  checksum: 10c0/8ca39b27b5f9bd7f32db795045933ab5247897660627251e8254180b792a395bf061ea7231947d5d7ffa5cb4cc771970fd4ef543275f9b559f08c9325cccfce3
   languageName: node
   linkType: hard
 
-"typescript@patch:typescript@npm%3A^5.0.0#optional!builtin<compat/typescript>, typescript@patch:typescript@npm%3A^5.0.4#optional!builtin<compat/typescript>, typescript@patch:typescript@npm%3A^5.4.5#optional!builtin<compat/typescript>":
-  version: 5.4.5
-  resolution: "typescript@patch:typescript@npm%3A5.4.5#optional!builtin<compat/typescript>::version=5.4.5&hash=5adc0c"
+"typescript@patch:typescript@npm%3A^5.0.0#optional!builtin<compat/typescript>, typescript@patch:typescript@npm%3A^5.0.4#optional!builtin<compat/typescript>, typescript@patch:typescript@npm%3A^5.5.2#optional!builtin<compat/typescript>":
+  version: 5.5.2
+  resolution: "typescript@patch:typescript@npm%3A5.5.2#optional!builtin<compat/typescript>::version=5.5.2&hash=b45daf"
   bin:
     tsc: bin/tsc
     tsserver: bin/tsserver
-  checksum: 10c0/db2ad2a16ca829f50427eeb1da155e7a45e598eec7b086d8b4e8ba44e5a235f758e606d681c66992230d3fc3b8995865e5fd0b22a2c95486d0b3200f83072ec9
+  checksum: 10c0/6721ac8933a70c252d7b640b345792e103d881811ff660355617c1836526dbb71c2044e2e77a8823fb3570b469f33276875a4cab6d3c4de4ae7d7ee1c3074ae4
   languageName: node
   linkType: hard