diff --git a/.changeset/cool-actors-attend.md b/.changeset/cool-actors-attend.md
new file mode 100644
index 0000000..e99d4ca
--- /dev/null
+++ b/.changeset/cool-actors-attend.md
@@ -0,0 +1,5 @@
+---
+"classcharts-api": patch
+---
+
+Require getLesson options argument
diff --git a/src/core/baseClient.ts b/src/core/baseClient.ts
index 6a301ec..ca6f2fa 100644
--- a/src/core/baseClient.ts
+++ b/src/core/baseClient.ts
@@ -244,7 +244,7 @@ export class BaseClient {
    * @param options GetLessonsOptions
    * @returns Array of lessons
    */
-  async getLessons(options?: GetLessonsOptions): Promise<LessonsResponse> {
+  async getLessons(options: GetLessonsOptions): Promise<LessonsResponse> {
     if (!options?.date) throw new Error("No date specified");
     const params = new URLSearchParams();
     params.append("date", String(options?.date));