diff --git a/ChangeLog.md b/ChangeLog.md
index f868b5e5d..fee3ba5a4 100644
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -1,5 +1,9 @@
 # Changelog
 
+## Unreleased
+* Libs/Java: Stop sharing one `ApiClient` between all `Svix` instances. Fixes a bug where multiple
+  independently instantiated `Svix` instances would always use the same base path and auth token.
+
 ## Version 1.45.0
 * CLI **(New)**: New Rust-based CLI with support for all recent Svix functionality.
 * Libs/Rust **(Breaking)**: Add `api::MessageAttemptListAttemptedMessagesOptions` and use it for
diff --git a/java/lib/src/main/java/com/svix/Application.java b/java/lib/src/main/java/com/svix/Application.java
index 2fe5a8a4e..85bb08be8 100644
--- a/java/lib/src/main/java/com/svix/Application.java
+++ b/java/lib/src/main/java/com/svix/Application.java
@@ -1,6 +1,7 @@
 package com.svix;
 
 import com.svix.exceptions.ApiException;
+import com.svix.internal.ApiClient;
 import com.svix.internal.api.ApplicationApi;
 import com.svix.models.ApplicationIn;
 import com.svix.models.ApplicationOut;
@@ -10,8 +11,8 @@
 public final class Application {
 	private final ApplicationApi api;
 
-	Application() {
-		api = new ApplicationApi();
+	Application(ApiClient apiClient) {
+		api = new ApplicationApi(apiClient);
 	}
 
 	public ListResponseApplicationOut list(final ApplicationListOptions options) throws ApiException {
diff --git a/java/lib/src/main/java/com/svix/Authentication.java b/java/lib/src/main/java/com/svix/Authentication.java
index d9b17b065..d88376bf1 100644
--- a/java/lib/src/main/java/com/svix/Authentication.java
+++ b/java/lib/src/main/java/com/svix/Authentication.java
@@ -1,6 +1,7 @@
 package com.svix;
 
 import com.svix.exceptions.ApiException;
+import com.svix.internal.ApiClient;
 import com.svix.internal.api.AuthenticationApi;
 import com.svix.models.AppPortalAccessIn;
 import com.svix.models.AppPortalAccessOut;
@@ -9,8 +10,8 @@
 public final class Authentication {
 	private final AuthenticationApi api;
 
-	Authentication() {
-		api = new AuthenticationApi();
+	Authentication(ApiClient apiClient) {
+		api = new AuthenticationApi(apiClient);
 	}
 
 	public AppPortalAccessOut appPortalAccess(final String appId, final AppPortalAccessIn appPortalAccessIn) throws ApiException {
diff --git a/java/lib/src/main/java/com/svix/BackgroundTask.java b/java/lib/src/main/java/com/svix/BackgroundTask.java
index e2cef152a..96bef1d58 100644
--- a/java/lib/src/main/java/com/svix/BackgroundTask.java
+++ b/java/lib/src/main/java/com/svix/BackgroundTask.java
@@ -1,6 +1,7 @@
 package com.svix;
 
 import com.svix.exceptions.ApiException;
+import com.svix.internal.ApiClient;
 import com.svix.internal.api.BackgroundTasksApi;
 import com.svix.models.BackgroundTaskOut;
 import com.svix.models.ListResponseBackgroundTaskOut;
@@ -8,8 +9,8 @@
 public final class BackgroundTask {
     private final BackgroundTasksApi api;
 
-    BackgroundTask() {
-        api = new BackgroundTasksApi();
+    BackgroundTask(ApiClient apiClient) {
+        api = new BackgroundTasksApi(apiClient);
     }
 
     public ListResponseBackgroundTaskOut list(final BackgroundTaskListOptions options) throws ApiException {
diff --git a/java/lib/src/main/java/com/svix/Endpoint.java b/java/lib/src/main/java/com/svix/Endpoint.java
index 34dfedd97..19b5ad9bf 100644
--- a/java/lib/src/main/java/com/svix/Endpoint.java
+++ b/java/lib/src/main/java/com/svix/Endpoint.java
@@ -1,6 +1,7 @@
 package com.svix;
 
 import com.svix.exceptions.ApiException;
+import com.svix.internal.ApiClient;
 import com.svix.internal.api.EndpointApi;
 import com.svix.models.EndpointHeadersIn;
 import com.svix.models.EndpointHeadersOut;
@@ -23,8 +24,8 @@
 public final class Endpoint {
 	private final EndpointApi api;
 
-	public Endpoint() {
-		api = new EndpointApi();
+	public Endpoint(ApiClient apiClient) {
+		api = new EndpointApi(apiClient);
 	}
 
 	public ListResponseEndpointOut list(final String appId, final EndpointListOptions options) throws ApiException {
diff --git a/java/lib/src/main/java/com/svix/EventType.java b/java/lib/src/main/java/com/svix/EventType.java
index 677f8c17d..18517291d 100644
--- a/java/lib/src/main/java/com/svix/EventType.java
+++ b/java/lib/src/main/java/com/svix/EventType.java
@@ -1,6 +1,7 @@
 package com.svix;
 
 import com.svix.exceptions.ApiException;
+import com.svix.internal.ApiClient;
 import com.svix.internal.api.EventTypeApi;
 import com.svix.models.EventTypeImportOpenApiIn;
 import com.svix.models.EventTypeImportOpenApiOut;
@@ -13,8 +14,8 @@
 public final class EventType {
 	private final EventTypeApi api;
 
-	public EventType() {
-		api = new EventTypeApi();
+	public EventType(ApiClient apiClient) {
+		api = new EventTypeApi(apiClient);
 	}
 
 	public ListResponseEventTypeOut list(final EventTypeListOptions options) throws ApiException {
diff --git a/java/lib/src/main/java/com/svix/Integration.java b/java/lib/src/main/java/com/svix/Integration.java
index 8d1cfd613..2f1ee62ba 100644
--- a/java/lib/src/main/java/com/svix/Integration.java
+++ b/java/lib/src/main/java/com/svix/Integration.java
@@ -1,6 +1,7 @@
 package com.svix;
 
 import com.svix.exceptions.ApiException;
+import com.svix.internal.ApiClient;
 import com.svix.internal.api.IntegrationApi;
 import com.svix.models.IntegrationIn;
 import com.svix.models.IntegrationOut;
@@ -11,8 +12,8 @@
 public final class Integration {
 	private final IntegrationApi api;
 
-	public Integration() {
-		api = new IntegrationApi();
+	public Integration(ApiClient apiClient) {
+		api = new IntegrationApi(apiClient);
 	}
 
 	public ListResponseIntegrationOut list(final String appId, final IntegrationListOptions options) throws ApiException {
diff --git a/java/lib/src/main/java/com/svix/Message.java b/java/lib/src/main/java/com/svix/Message.java
index 72343d4c7..4ea90b775 100644
--- a/java/lib/src/main/java/com/svix/Message.java
+++ b/java/lib/src/main/java/com/svix/Message.java
@@ -6,6 +6,7 @@
 import java.util.Map;
 
 import com.svix.exceptions.ApiException;
+import com.svix.internal.ApiClient;
 import com.svix.internal.api.MessageApi;
 import com.svix.models.ListResponseMessageOut;
 import com.svix.models.MessageIn;
@@ -15,8 +16,8 @@
 public final class Message {
 	private final MessageApi api;
 
-	Message() {
-		api = new MessageApi();
+	Message(ApiClient apiClient) {
+		api = new MessageApi(apiClient);
 	}
 
 	private static MessageIn messageInEmptyPayload() {
diff --git a/java/lib/src/main/java/com/svix/MessageAttempt.java b/java/lib/src/main/java/com/svix/MessageAttempt.java
index a80cc8cbd..b46a9050a 100644
--- a/java/lib/src/main/java/com/svix/MessageAttempt.java
+++ b/java/lib/src/main/java/com/svix/MessageAttempt.java
@@ -3,6 +3,7 @@
 import java.util.HashSet;
 
 import com.svix.exceptions.ApiException;
+import com.svix.internal.ApiClient;
 import com.svix.internal.api.MessageAttemptApi;
 import com.svix.models.ListResponseEndpointMessageOut;
 import com.svix.models.ListResponseMessageAttemptEndpointOut;
@@ -13,8 +14,8 @@
 public final class MessageAttempt {
 	private final MessageAttemptApi api;
 
-	MessageAttempt() {
-		api = new MessageAttemptApi();
+	MessageAttempt(ApiClient apiClient) {
+		api = new MessageAttemptApi(apiClient);
 	}
 
 	/*
diff --git a/java/lib/src/main/java/com/svix/OperationalWebhookEndpoint.java b/java/lib/src/main/java/com/svix/OperationalWebhookEndpoint.java
index 7d8797fcb..eb568caf0 100644
--- a/java/lib/src/main/java/com/svix/OperationalWebhookEndpoint.java
+++ b/java/lib/src/main/java/com/svix/OperationalWebhookEndpoint.java
@@ -1,6 +1,7 @@
 package com.svix;
 
 import com.svix.exceptions.ApiException;
+import com.svix.internal.ApiClient;
 import com.svix.internal.api.WebhookEndpointApi;
 import com.svix.models.OperationalWebhookEndpointIn;
 import com.svix.models.OperationalWebhookEndpointOut;
@@ -12,8 +13,8 @@
 public final class OperationalWebhookEndpoint {
 	private final WebhookEndpointApi api;
 
-	public OperationalWebhookEndpoint() {
-		api = new WebhookEndpointApi();
+	public OperationalWebhookEndpoint(ApiClient apiClient) {
+		api = new WebhookEndpointApi(apiClient);
 	}
 
 	public ListResponseOperationalWebhookEndpointOut list(final OperationalWebhookEndpointListOptions options) throws ApiException {
diff --git a/java/lib/src/main/java/com/svix/Statistics.java b/java/lib/src/main/java/com/svix/Statistics.java
index 021ba9fe7..a6eece4d6 100644
--- a/java/lib/src/main/java/com/svix/Statistics.java
+++ b/java/lib/src/main/java/com/svix/Statistics.java
@@ -1,6 +1,7 @@
 package com.svix;
 
 import com.svix.exceptions.ApiException;
+import com.svix.internal.ApiClient;
 import com.svix.internal.api.StatisticsApi;
 import com.svix.models.AggregateEventTypesOut;
 import com.svix.models.AppUsageStatsIn;
@@ -9,8 +10,8 @@
 public class Statistics {
     private final StatisticsApi api;
 
-    Statistics() {
-        api = new StatisticsApi();
+    Statistics(ApiClient apiClient) {
+        api = new StatisticsApi(apiClient);
     }
 
     public AppUsageStatsOut aggregateAppStats(final AppUsageStatsIn appUsageStatsIn, final PostOptions options) throws ApiException {
diff --git a/java/lib/src/main/java/com/svix/Svix.java b/java/lib/src/main/java/com/svix/Svix.java
index 81ca3e742..db1dcc2a0 100644
--- a/java/lib/src/main/java/com/svix/Svix.java
+++ b/java/lib/src/main/java/com/svix/Svix.java
@@ -40,23 +40,20 @@ public Svix(final String token, final SvixOptions options) {
 			}
 		}
 
-
 		apiClient.setUserAgent(String.format("svix-libs/%s/java", Svix.VERSION));
 
 		HttpBearerAuth httpBearer = (HttpBearerAuth) apiClient.getAuthentication("HTTPBearer");
 		httpBearer.setBearerToken(token);
 
-		Configuration.setDefaultApiClient(apiClient);
-
-		application = new Application();
-		authentication = new Authentication();
-		endpoint = new Endpoint();
-		eventType = new EventType();
-		integration = new Integration();
-		message = new Message();
-		messageAttempt = new MessageAttempt();
-		statistics = new Statistics();
-		operationalWebhookEndpoint = new OperationalWebhookEndpoint();
+		application = new Application(apiClient);
+		authentication = new Authentication(apiClient);
+		endpoint = new Endpoint(apiClient);
+		eventType = new EventType(apiClient);
+		integration = new Integration(apiClient);
+		message = new Message(apiClient);
+		messageAttempt = new MessageAttempt(apiClient);
+		statistics = new Statistics(apiClient);
+		operationalWebhookEndpoint = new OperationalWebhookEndpoint(apiClient);
 	}
 
 	public Application getApplication() {