diff --git a/.changeset/poor-moons-impress.md b/.changeset/poor-moons-impress.md
new file mode 100644
index 0000000000..f441cba1f2
--- /dev/null
+++ b/.changeset/poor-moons-impress.md
@@ -0,0 +1,5 @@
+---
+'@backstage/plugin-tech-insights': patch
+---
+
+Set content type to 'application/json' in TechInsightsClient
diff --git a/plugins/tech-insights/src/api/TechInsightsClient.ts b/plugins/tech-insights/src/api/TechInsightsClient.ts
index 6e85769b34..0f55a8f8e1 100644
--- a/plugins/tech-insights/src/api/TechInsightsClient.ts
+++ b/plugins/tech-insights/src/api/TechInsightsClient.ts
@@ -82,6 +82,9 @@ export class TechInsightsClient implements TechInsightsApi {
       {
         method: 'POST',
         body: JSON.stringify(requestBody),
+        headers: {
+          'content-type': 'application/json',
+        },
       },
     );
   }
@@ -98,6 +101,9 @@ export class TechInsightsClient implements TechInsightsApi {
     return this.api('/checks/run', {
       method: 'POST',
       body: JSON.stringify(requestBody),
+      headers: {
+        'content-type': 'application/json',
+      },
     });
   }