diff --git a/src/main/java/org/cryptomator/ui/keyloading/hub/ReceiveKeyController.java b/src/main/java/org/cryptomator/ui/keyloading/hub/ReceiveKeyController.java
index 07dc1e215..44a09b988 100644
--- a/src/main/java/org/cryptomator/ui/keyloading/hub/ReceiveKeyController.java
+++ b/src/main/java/org/cryptomator/ui/keyloading/hub/ReceiveKeyController.java
@@ -56,7 +56,7 @@ public class ReceiveKeyController implements FxController {
 		this.vaultBaseUri = getVaultBaseUri(vault);
 		this.licenseExceededScene = licenseExceededScene;
 		this.window.addEventHandler(WindowEvent.WINDOW_HIDING, this::windowClosed);
-		this.httpClient = HttpClient.newBuilder().executor(executor).build();
+		this.httpClient = HttpClient.newBuilder().version(HttpClient.Version.HTTP_1_1).executor(executor).build();
 	}
 
 	@FXML
diff --git a/src/main/java/org/cryptomator/ui/keyloading/hub/RegisterDeviceController.java b/src/main/java/org/cryptomator/ui/keyloading/hub/RegisterDeviceController.java
index bd997d994..4cf2d9fa2 100644
--- a/src/main/java/org/cryptomator/ui/keyloading/hub/RegisterDeviceController.java
+++ b/src/main/java/org/cryptomator/ui/keyloading/hub/RegisterDeviceController.java
@@ -76,7 +76,7 @@ public class RegisterDeviceController implements FxController {
 		this.registerFailedScene = registerFailedScene;
 		this.jwt = JWT.decode(this.bearerToken);
 		this.window.addEventHandler(WindowEvent.WINDOW_HIDING, this::windowClosed);
-		this.httpClient = HttpClient.newBuilder().executor(executor).build();
+		this.httpClient = HttpClient.newBuilder().version(HttpClient.Version.HTTP_1_1).executor(executor).build();
 	}
 
 	public void initialize() {