diff --git a/.changeset/tasty-frogs-tan.md b/.changeset/tasty-frogs-tan.md
new file mode 100644
index 00000000..8d48f384
--- /dev/null
+++ b/.changeset/tasty-frogs-tan.md
@@ -0,0 +1,5 @@
+---
+"website": patch
+---
+
+Use ts-essentials@10
diff --git a/package.json b/package.json
index 3f9ec100..36e5bfc1 100644
--- a/package.json
+++ b/package.json
@@ -32,7 +32,7 @@
     "@types/node": "^20.12.7",
     "chai": "^4.4.1",
     "chai-as-promised": "^7.1.1",
-    "conditional-type-checks": "^1.0.6",
+    "ts-essentials": "^10.0.0",
     "mocha": "10.2.0",
     "rimraf": "^4.4.1",
     "ts-node": "^10.9.2",
diff --git a/packages/earl/src/mocks/mockFn.test.ts b/packages/earl/src/mocks/mockFn.test.ts
index be0700ba..735d2e74 100644
--- a/packages/earl/src/mocks/mockFn.test.ts
+++ b/packages/earl/src/mocks/mockFn.test.ts
@@ -1,9 +1,9 @@
 import { expect } from 'chai'
-import type { AssertTrue, IsExact } from 'conditional-type-checks'
+import { isExact } from 'ts-essentials'
 
 import { expect as earl } from '../expect.js'
 import { isMockFn, mockFn } from './mockFn.js'
-import type { MockFunction, MockFunctionOf } from './types/index.js'
+import type { MockFunction } from './types/index.js'
 
 const sum = (a: number, b: number) => a + b
 
@@ -159,12 +159,7 @@ describe('Mock', () => {
 
       expect(fn(2, 2)).to.eq(4)
 
-      type _ = AssertTrue<
-        IsExact<
-          MockFunction<[number, number], number>,
-          MockFunctionOf<Operation>
-        >
-      >
+      isExact<MockFunction<[number, number], number>>()(fn)
     })
   })
 
diff --git a/packages/website/package.json b/packages/website/package.json
index 1fbba991..0aa1a0d9 100644
--- a/packages/website/package.json
+++ b/packages/website/package.json
@@ -22,7 +22,6 @@
     "@types/lodash": "^4.14.191",
     "fast-glob": "^3.2.12",
     "lodash": "^4.17.21",
-    "ts-essentials": "^9.3.1",
     "ts-morph": "^17.0.1",
     "vitepress": "1.0.0-alpha.51"
   },
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index e04095b4..4a44e2ab 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -32,15 +32,15 @@ importers:
       chai-as-promised:
         specifier: ^7.1.1
         version: 7.1.1(chai@4.4.1)
-      conditional-type-checks:
-        specifier: ^1.0.6
-        version: 1.0.6
       mocha:
         specifier: 10.2.0
         version: 10.2.0
       rimraf:
         specifier: ^4.4.1
         version: 4.4.1
+      ts-essentials:
+        specifier: ^10.0.0
+        version: 10.0.1(typescript@5.4.5)
       ts-node:
         specifier: ^10.9.2
         version: 10.9.2(@types/node@20.12.7)(typescript@5.4.5)
@@ -175,9 +175,6 @@ importers:
       lodash:
         specifier: ^4.17.21
         version: 4.17.21
-      ts-essentials:
-        specifier: ^9.3.1
-        version: 9.3.1(typescript@5.4.5)
       ts-morph:
         specifier: ^17.0.1
         version: 17.0.1
@@ -1670,9 +1667,6 @@ packages:
   concat-map@0.0.1:
     resolution: {integrity: sha512-/Srv4dswyQNBfohGpz9o6Yb3Gz3SrUDqBH5rTuhGR7ahtlbYKnVxw2bCFMRljaA7EXHaXZ8wsHdodFvbkhKmqg==}
 
-  conditional-type-checks@1.0.6:
-    resolution: {integrity: sha512-3vyi+yNcmKq+xl1sTX7Ta+4pUvjusMYbC6FSbrS6YJV8TI51wiRn24u4bfdFVhDKKH5GtpKQzxW7bqXbPWllgQ==}
-
   convert-source-map@2.0.0:
     resolution: {integrity: sha512-Kvp459HrV2FEJ1CAsi1Ku+MY3kasH19TFykTz2xWmMeq6bk2NU3XXvfJ+Q61m0xktWwt+1HSYf3JZsTms3aRJg==}
 
@@ -2982,10 +2976,13 @@ packages:
     resolution: {integrity: sha512-c1PTsA3tYrIsLGkJkzHF+w9F2EyxfXGo4UyJc4pFL++FMjnq0HJS69T3M7d//gKrFKwy429bouPescbjecU+Zw==}
     engines: {node: '>=8'}
 
-  ts-essentials@9.3.1:
-    resolution: {integrity: sha512-9CChSvQMyVRo29Vb1A2jbs+LKo3d/bAf+ndSaX0T8cEiy/HChVaRN/HY5DqUryZ8hZ6uol9bEgCnGmnDbwBR9Q==}
+  ts-essentials@10.0.1:
+    resolution: {integrity: sha512-HPH+H2bkkO8FkMDau+hFvv7KYozzned9Zr1Urn7rRPXMF4mZmCKOq+u4AI1AAW+2bofIOXTuSdKo9drQuni2dQ==}
     peerDependencies:
-      typescript: '>=4.1.0'
+      typescript: '>=4.5.0'
+    peerDependenciesMeta:
+      typescript:
+        optional: true
 
   ts-morph@17.0.1:
     resolution: {integrity: sha512-10PkHyXmrtsTvZSL+cqtJLTgFXkU43Gd0JCc0Rw6GchWbqKe0Rwgt1v3ouobTZwQzF1mGhDeAlWYBMGRV7y+3g==}
@@ -4916,8 +4913,6 @@ snapshots:
 
   concat-map@0.0.1: {}
 
-  conditional-type-checks@1.0.6: {}
-
   convert-source-map@2.0.0: {}
 
   core-js-compat@3.37.0:
@@ -6404,8 +6399,8 @@ snapshots:
 
   trim-newlines@3.0.1: {}
 
-  ts-essentials@9.3.1(typescript@5.4.5):
-    dependencies:
+  ts-essentials@10.0.1(typescript@5.4.5):
+    optionalDependencies:
       typescript: 5.4.5
 
   ts-morph@17.0.1: