diff --git a/package-lock.json b/package-lock.json
index cfaf5bb..8b5aaea 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
     "name": "@doist/todoist-api-typescript",
-    "version": "2.0.2",
+    "version": "2.0.3",
     "lockfileVersion": 2,
     "requires": true,
     "packages": {
         "": {
             "name": "@doist/todoist-api-typescript",
-            "version": "2.0.2",
+            "version": "2.0.3",
             "license": "MIT",
             "dependencies": {
                 "axios": "^0.27.0",
diff --git a/package.json b/package.json
index 66b87a3..b8f3b71 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
     "name": "@doist/todoist-api-typescript",
-    "version": "2.0.2",
+    "version": "2.0.3",
     "description": "A typescript wrapper for the Todoist REST API.",
     "author": "Doist developers",
     "repository": "git@github.com:doist/todoist-api-typescript.git",
diff --git a/src/TodoistApi.projects.test.ts b/src/TodoistApi.projects.test.ts
index 5fcd24e..cc07b69 100644
--- a/src/TodoistApi.projects.test.ts
+++ b/src/TodoistApi.projects.test.ts
@@ -150,6 +150,7 @@ describe('TodoistApi project endpoints', () => {
                 getRestBaseUri(),
                 `${ENDPOINT_REST_PROJECTS}/${projectId}`,
                 DEFAULT_AUTH_TOKEN,
+                undefined,
                 DEFAULT_REQUEST_ID,
             )
         })
diff --git a/src/TodoistApi.ts b/src/TodoistApi.ts
index ae816d1..7f232f7 100644
--- a/src/TodoistApi.ts
+++ b/src/TodoistApi.ts
@@ -240,6 +240,7 @@ export class TodoistApi {
             this.restApiBase,
             generatePath(ENDPOINT_REST_PROJECTS, id),
             this.authToken,
+            undefined,
             requestId,
         )
         return isSuccess(response)
@@ -263,7 +264,7 @@ export class TodoistApi {
             this.restApiBase,
             ENDPOINT_REST_SECTIONS,
             this.authToken,
-            projectId && { projectId },
+            projectId ? { projectId } : undefined,
         )
 
         return validateSectionArray(response.data)
diff --git a/src/restClient.axios.test.ts b/src/restClient.axios.test.ts
new file mode 100644
index 0000000..5cb1a2a
--- /dev/null
+++ b/src/restClient.axios.test.ts
@@ -0,0 +1,18 @@
+import axios from 'axios'
+import { paramsSerializer } from './restClient'
+
+const DEFAULT_BASE_URI = 'https://api.todoist.com/rest/v2/tasks'
+
+describe('axios tests without mocking', () => {
+    test('GET calls serialise arrays correctly', () => {
+        const requestUri = axios.create().getUri({
+            method: 'GET',
+            baseURL: DEFAULT_BASE_URI,
+            params: {
+                ids: ['12345', '56789'],
+            },
+            paramsSerializer,
+        })
+        expect(requestUri).toEqual('https://api.todoist.com/rest/v2/tasks?ids=12345%2C56789')
+    })
+})
diff --git a/src/restClient.test.ts b/src/restClient.test.ts
index b8f25b2..fcc87a3 100644
--- a/src/restClient.test.ts
+++ b/src/restClient.test.ts
@@ -1,5 +1,5 @@
 import Axios, { AxiosStatic, AxiosResponse, AxiosError } from 'axios'
-import { request, isSuccess } from './restClient'
+import { request, isSuccess, paramsSerializer } from './restClient'
 import { TodoistRequestError } from './types/errors'
 import * as caseConverter from 'axios-case-converter'
 import { assertInstance } from './testUtils/asserts'
@@ -120,6 +120,7 @@ describe('restClient', () => {
         expect(axiosMock.get).toBeCalledTimes(1)
         expect(axiosMock.get).toBeCalledWith(DEFAULT_ENDPOINT, {
             params: undefined,
+            paramsSerializer,
         })
     })
 
@@ -135,6 +136,7 @@ describe('restClient', () => {
         expect(axiosMock.get).toBeCalledTimes(1)
         expect(axiosMock.get).toBeCalledWith(DEFAULT_ENDPOINT, {
             params: DEFAULT_PAYLOAD,
+            paramsSerializer,
         })
     })
 
diff --git a/src/restClient.ts b/src/restClient.ts
index 96a3b3a..ac836eb 100644
--- a/src/restClient.ts
+++ b/src/restClient.ts
@@ -5,6 +5,21 @@ import { HttpMethod } from './types/http'
 import { v4 as uuidv4 } from 'uuid'
 import axiosRetry from 'axios-retry'
 
+export function paramsSerializer(params: Record<string, unknown>) {
+    const qs = new URLSearchParams()
+
+    Object.keys(params).forEach((key) => {
+        const value = params[key]
+        if (Array.isArray(value)) {
+            qs.append(key, value.join(','))
+        } else {
+            qs.append(key, String(value))
+        }
+    })
+
+    return qs.toString()
+}
+
 const defaultHeaders = {
     'Content-Type': 'application/json',
 }
@@ -71,7 +86,7 @@ export async function request<T>(
     baseUri: string,
     relativePath: string,
     apiToken?: string,
-    payload?: unknown,
+    payload?: Record<string, unknown>,
     requestId?: string,
 ): Promise<AxiosResponse<T>> {
     // axios loses the original stack when returning errors, for the sake of better reporting
@@ -88,7 +103,10 @@ export async function request<T>(
 
         switch (httpMethod) {
             case 'GET':
-                return await axiosClient.get<T>(relativePath, { params: payload })
+                return await axiosClient.get<T>(relativePath, {
+                    params: payload,
+                    paramsSerializer,
+                })
             case 'POST':
                 return await axiosClient.post<T>(relativePath, payload)
             case 'DELETE':