diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5f0f58ec2..c74f4d46a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,28 @@
+## [41.0.0](https://github.com/ipfs/aegir/compare/v40.0.13...v41.0.0) (2023-09-30)
+
+
+### ⚠ BREAKING CHANGES
+
+* All interfaces now need to use method signature style rather than property function style
+
+eg:
+before
+```ts
+interface Foo {
+  bar: (baz: number) => void
+}
+```
+after
+```ts
+interface Foo {
+  bar(baz: number): void
+}
+```
+
+### Dependencies
+
+* update eslint-config-ipfs ([#1374](https://github.com/ipfs/aegir/issues/1374)) ([5fadfb7](https://github.com/ipfs/aegir/commit/5fadfb70dc7874acb9265bcdc6b5da4a9d110ad1))
+
 ## [40.0.13](https://github.com/ipfs/aegir/compare/v40.0.12...v40.0.13) (2023-09-07)
 
 
diff --git a/package.json b/package.json
index aa4e7d9f8..6d461c9e4 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "aegir",
-  "version": "40.0.13",
+  "version": "41.0.0",
   "description": "JavaScript project management",
   "license": "Apache-2.0 OR MIT",
   "homepage": "https://github.com/ipfs/aegir#readme",
@@ -258,7 +258,7 @@
     "env-paths": "^3.0.0",
     "esbuild": "^0.19.2",
     "eslint": "^8.31.0",
-    "eslint-config-ipfs": "^5.0.0",
+    "eslint-config-ipfs": "^6.0.0",
     "eslint-plugin-etc": "^2.0.2",
     "eslint-plugin-import": "^2.18.0",
     "eslint-plugin-jsdoc": "^46.4.3",
diff --git a/src/types.ts b/src/types.ts
index f8e677f24..ce7de3180 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -253,12 +253,12 @@ interface TestOptions {
    * Before tests hook
    */
   // eslint-disable-next-line @typescript-eslint/no-invalid-void-type
-  before: (options: GlobalOptions & TestOptions) => Promise<TestBeforeResult | void >
+  before(options: GlobalOptions & TestOptions): Promise<TestBeforeResult | void >
   /**
    * After tests hook
    */
   // eslint-disable-next-line @typescript-eslint/no-invalid-void-type
-  after: (options: GlobalOptions & TestOptions, beforeResult: TestBeforeResult | void) => Promise<void>
+  after(options: GlobalOptions & TestOptions, beforeResult: TestBeforeResult | void): Promise<void>
 }
 
 interface TestBeforeResult {
diff --git a/test/fixtures/projects/a-monorepo/packages/a-workspace-project/src/types.ts b/test/fixtures/projects/a-monorepo/packages/a-workspace-project/src/types.ts
index a0f8b6be4..08c6ad031 100644
--- a/test/fixtures/projects/a-monorepo/packages/a-workspace-project/src/types.ts
+++ b/test/fixtures/projects/a-monorepo/packages/a-workspace-project/src/types.ts
@@ -1,3 +1,3 @@
 export interface ExportedButNotInExports {
-  aMethod: () => void
+  aMethod(): void
 }
diff --git a/test/fixtures/projects/a-monorepo/packages/another-workspace-project/src/types.ts b/test/fixtures/projects/a-monorepo/packages/another-workspace-project/src/types.ts
index a0f8b6be4..08c6ad031 100644
--- a/test/fixtures/projects/a-monorepo/packages/another-workspace-project/src/types.ts
+++ b/test/fixtures/projects/a-monorepo/packages/another-workspace-project/src/types.ts
@@ -1,3 +1,3 @@
 export interface ExportedButNotInExports {
-  aMethod: () => void
+  aMethod(): void
 }
diff --git a/test/fixtures/projects/a-ts-project/src/a-module.ts b/test/fixtures/projects/a-ts-project/src/a-module.ts
index 9213777e3..a6dbc6a02 100644
--- a/test/fixtures/projects/a-ts-project/src/a-module.ts
+++ b/test/fixtures/projects/a-ts-project/src/a-module.ts
@@ -1,7 +1,7 @@
 export interface ExportedButNotInExports {
-  aMethod: () => void
+  aMethod(): void
 }
 
 export interface UsedButNotExported {
-  aMethod: () => void
+  aMethod(): void
 }
diff --git a/test/fixtures/projects/a-ts-project/src/index.ts b/test/fixtures/projects/a-ts-project/src/index.ts
index 68870c473..f43b9a90c 100644
--- a/test/fixtures/projects/a-ts-project/src/index.ts
+++ b/test/fixtures/projects/a-ts-project/src/index.ts
@@ -14,7 +14,7 @@ export const useDerp = (): void => {
 }
 
 export interface AnExportedInterface {
-  aMethod: () => void
+  aMethod(): void
 }
 
 export type { ExportedButNotInExports } from './a-module.js'
diff --git a/test/fixtures/projects/an-esm-project/src/types.ts b/test/fixtures/projects/an-esm-project/src/types.ts
index 9213777e3..a6dbc6a02 100644
--- a/test/fixtures/projects/an-esm-project/src/types.ts
+++ b/test/fixtures/projects/an-esm-project/src/types.ts
@@ -1,7 +1,7 @@
 export interface ExportedButNotInExports {
-  aMethod: () => void
+  aMethod(): void
 }
 
 export interface UsedButNotExported {
-  aMethod: () => void
+  aMethod(): void
 }