diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index 5fdd883..c4ddc74 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "1.1.0"
+  ".": "1.1.1"
 }
diff --git a/CHANGELOG.md b/CHANGELOG.md
index d509d98..397ef6f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,13 @@
 # Changelog
 
+## 1.1.1 (2026-06-17)
+
+Full Changelog: [v1.1.0...v1.1.1](https://github.com/parallel-web/parallel-sdk-typescript/compare/v1.1.0...v1.1.1)
+
+### Bug Fixes
+
+* **client:** send content-type header for requests with an omitted optional body ([c6fe4a8](https://github.com/parallel-web/parallel-sdk-typescript/commit/c6fe4a83c994e6e669223ef4343462c614a32541))
+
 ## 1.1.0 (2026-06-08)
 
 Full Changelog: [v1.0.1...v1.1.0](https://github.com/parallel-web/parallel-sdk-typescript/compare/v1.0.1...v1.1.0)
diff --git a/package.json b/package.json
index 1a1e419..89c2a49 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "parallel-web",
-  "version": "1.1.0",
+  "version": "1.1.1",
   "description": "The official TypeScript library for the Parallel API",
   "author": "Parallel <support@parallel.ai>",
   "types": "dist/index.d.ts",
diff --git a/src/client.ts b/src/client.ts
index b216d9a..feaa40e 100644
--- a/src/client.ts
+++ b/src/client.ts
@@ -782,11 +782,19 @@ export class Parallel {
     return () => controller.abort();
   }
 
-  private buildBody({ options: { body, headers: rawHeaders } }: { options: FinalRequestOptions }): {
+  private buildBody({ options }: { options: FinalRequestOptions }): {
     bodyHeaders: HeadersLike;
     body: BodyInit | undefined;
   } {
+    const { body, headers: rawHeaders } = options;
     if (!body) {
+      // A resource method always passes a `body` key when its operation defines a
+      // request body, even if the caller omitted an optional body param. Keep the
+      // content-type for those, and only elide it for operations with no body at
+      // all (e.g. GET/DELETE).
+      if (body == null && 'body' in options) {
+        return this.#encoder({ body, headers: buildHeaders([rawHeaders]) });
+      }
       return { bodyHeaders: undefined, body: undefined };
     }
     const headers = buildHeaders([rawHeaders]);
diff --git a/src/version.ts b/src/version.ts
index c80f975..4d7aaa3 100644
--- a/src/version.ts
+++ b/src/version.ts
@@ -1 +1 @@
-export const VERSION = '1.1.0'; // x-release-please-version
+export const VERSION = '1.1.1'; // x-release-please-version