diff --git a/README.md b/README.md
index 90657440..65b749be 100644
--- a/README.md
+++ b/README.md
@@ -29,13 +29,13 @@ We recommend using the provided Docker container.
 
 A pre-build version is available at [docker hub](https://hub.docker.com/repository/docker/ghga/ghga-connector):
 ```bash
-docker pull ghga/ghga-connector:1.1.1
+docker pull ghga/ghga-connector:1.1.2
 ```
 
 Or you can build the container yourself from the [`./Dockerfile`](./Dockerfile):
 ```bash
 # Execute in the repo's root dir:
-docker build -t ghga/ghga-connector:1.1.1 .
+docker build -t ghga/ghga-connector:1.1.2 .
 ```
 
 For production-ready deployment, we recommend using Kubernetes, however,
@@ -43,7 +43,7 @@ for simple use cases, you could execute the service using docker
 on a single server:
 ```bash
 # The entrypoint is preconfigured:
-docker run -p 8080:8080 ghga/ghga-connector:1.1.1 --help
+docker run -p 8080:8080 ghga/ghga-connector:1.1.2 --help
 ```
 
 If you prefer not to use containers, you may install the service from source:
diff --git a/pyproject.toml b/pyproject.toml
index 4c1ee04e..55d400b5 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "ghga_connector"
-version = "1.1.1"
+version = "1.1.2"
 description = "GHGA Connector - A CLI client application for interacting with the GHGA system."
 readme = "README.md"
 authors = [
diff --git a/src/ghga_connector/core/api_calls/download.py b/src/ghga_connector/core/api_calls/download.py
index c0116516..7efbcbf1 100644
--- a/src/ghga_connector/core/api_calls/download.py
+++ b/src/ghga_connector/core/api_calls/download.py
@@ -21,7 +21,6 @@
 from typing import Union
 
 import httpx
-from requests.structures import CaseInsensitiveDict
 
 from ghga_connector.core import exceptions
 from ghga_connector.core.api_calls.work_package import WorkPackageAccessor
@@ -55,13 +54,11 @@ def get_download_url(
 
     # build url and headers
     url = f"{work_package_accessor.dcs_api_url}/objects/{file_id}"
-    headers = CaseInsensitiveDict(
-        {
-            "Accept": "application/json",
-            "Authorization": f"Bearer {decrypted_token}",
-            "Content-Type": "application/json",
-        }
-    )
+    headers = {
+        "Accept": "application/json",
+        "Authorization": f"Bearer {decrypted_token}",
+        "Content-Type": "application/json",
+    }
 
     # Make function call to get download url
     try:
@@ -180,13 +177,11 @@ def get_file_header_envelope(
     # build url and headers
     url = f"{work_package_accessor.dcs_api_url}/objects/{file_id}/envelopes"
 
-    headers = CaseInsensitiveDict(
-        {
-            "Accept": "application/json",
-            "Authorization": f"Bearer {decrypted_token}",
-            "Content-Type": "application/json",
-        }
-    )
+    headers = {
+        "Accept": "application/json",
+        "Authorization": f"Bearer {decrypted_token}",
+        "Content-Type": "application/json",
+    }
 
     # Make function call to get envelope
     try: