diff --git a/.changeset/remove-type-fest-github.md b/.changeset/remove-type-fest-github.md
new file mode 100644
index 0000000000..1b8e67f17d
--- /dev/null
+++ b/.changeset/remove-type-fest-github.md
@@ -0,0 +1,5 @@
+---
+'@backstage/plugin-catalog-backend-module-github': patch
+---
+
+Removed the `type-fest` dev dependency, replacing its `PartialDeep` import with a local helper type in tests.
diff --git a/plugins/catalog-backend-module-github/package.json b/plugins/catalog-backend-module-github/package.json
index f3504d861d..8a660ab7d1 100644
--- a/plugins/catalog-backend-module-github/package.json
+++ b/plugins/catalog-backend-module-github/package.json
@@ -81,8 +81,7 @@
     "@backstage/plugin-events-backend-module-github": "workspace:^",
     "@backstage/plugin-events-backend-module-google-pubsub": "workspace:^",
     "@types/lodash": "^4.14.151",
-    "msw": "^2.0.0",
-    "type-fest": "^4.41.0"
+    "msw": "^2.0.0"
   },
   "configSchema": "config.d.ts"
 }
diff --git a/plugins/catalog-backend-module-github/src/providers/GithubEntityProvider.test.ts b/plugins/catalog-backend-module-github/src/providers/GithubEntityProvider.test.ts
index 19042c0cd9..21fb13f02b 100644
--- a/plugins/catalog-backend-module-github/src/providers/GithubEntityProvider.test.ts
+++ b/plugins/catalog-backend-module-github/src/providers/GithubEntityProvider.test.ts
@@ -35,7 +35,14 @@ import {
   RepositoryEvent,
   RepositoryRenamedEvent,
 } from '@octokit/webhooks-types';
-import type { PartialDeep } from 'type-fest';
+
+type PartialDeep<T> = T extends (...args: any[]) => any
+  ? T
+  : T extends Array<infer U>
+  ? Array<PartialDeep<U>>
+  : T extends object
+  ? { [K in keyof T]?: PartialDeep<T[K]> }
+  : T;
 
 jest.mock('../lib/github', () => {
   return {
diff --git a/yarn.lock b/yarn.lock
index e5d72ed98b..5565bc6a95 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -4921,7 +4921,6 @@ __metadata:
     minimatch: "npm:^10.2.1"
     msw: "npm:^2.0.0"
     octokit: "npm:^3.0.0"
-    type-fest: "npm:^4.41.0"
     uuid: "npm:^11.0.0"
   languageName: unknown
   linkType: soft
@@ -48922,7 +48921,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"type-fest@npm:^4.26.1, type-fest@npm:^4.3.1, type-fest@npm:^4.41.0":
+"type-fest@npm:^4.26.1, type-fest@npm:^4.3.1":
   version: 4.41.0
   resolution: "type-fest@npm:4.41.0"
   checksum: 10/617ace794ac0893c2986912d28b3065ad1afb484cad59297835a0807dc63286c39e8675d65f7de08fafa339afcb8fe06a36e9a188b9857756ae1e92ee8bda212