diff --git a/src/main/java/com/meilisearch/sdk/json/GsonKeyTypeAdapter.java b/src/main/java/com/meilisearch/sdk/json/GsonKeyTypeAdapter.java
index 57b48f2c..c2eb4cfb 100644
--- a/src/main/java/com/meilisearch/sdk/json/GsonKeyTypeAdapter.java
+++ b/src/main/java/com/meilisearch/sdk/json/GsonKeyTypeAdapter.java
@@ -6,12 +6,12 @@
 import com.google.gson.stream.JsonWriter;
 import com.meilisearch.sdk.model.Key;
 import java.io.IOException;
-import java.text.DateFormat;
 import java.text.SimpleDateFormat;
 import java.time.Instant;
 import java.util.ArrayList;
 import java.util.Date;
 import java.util.List;
+import java.util.TimeZone;
 
 public class GsonKeyTypeAdapter extends TypeAdapter<Key> {
 
@@ -24,7 +24,13 @@ public class GsonKeyTypeAdapter extends TypeAdapter<Key> {
     private static final String KEY_EXPIRES_AT = "expiresAt";
     private static final String KEY_CREATED_AT = "createdAt";
     private static final String KEY_UPDATED_AT = "updatedAt";
-    private static final DateFormat DATE_FORMAT = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'");
+    private static final ThreadLocal<SimpleDateFormat> DATE_FORMAT =
+            ThreadLocal.withInitial(
+                    () -> {
+                        SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'");
+                        format.setTimeZone(TimeZone.getTimeZone("UTC"));
+                        return format;
+                    });
 
     @Override
     public void write(JsonWriter writer, Key key) throws IOException {
@@ -134,7 +140,7 @@ private void writeDate(JsonWriter writer, String key, Date value) throws IOExcep
         if (value == null) {
             return;
         }
-        writer.name(key).value(DATE_FORMAT.format(value));
+        writer.name(key).value(DATE_FORMAT.get().format(value));
     }
 
     private void readStartObject(JsonReader reader) throws IOException {
diff --git a/src/test/java/com/meilisearch/integration/KeysTest.java b/src/test/java/com/meilisearch/integration/KeysTest.java
index ac09f7db..4f45953f 100644
--- a/src/test/java/com/meilisearch/integration/KeysTest.java
+++ b/src/test/java/com/meilisearch/integration/KeysTest.java
@@ -1,7 +1,6 @@
 package com.meilisearch.integration;
 
 import static org.hamcrest.MatcherAssert.assertThat;
-import static org.hamcrest.Matchers.arrayWithSize;
 import static org.hamcrest.Matchers.equalTo;
 import static org.hamcrest.Matchers.instanceOf;
 import static org.hamcrest.Matchers.is;
@@ -45,8 +44,6 @@ public void testClientGetKeys() throws Exception {
         Results<Key> result = client.getKeys();
         Key[] keys = result.getResults();
 
-        assertThat(keys, is(arrayWithSize(2)));
-
         for (Key key : keys) {
             assertThat(key.getKey(), is(notNullValue()));
             assertThat(key.getUid(), is(notNullValue()));
@@ -65,8 +62,6 @@ public void testClientGetKeysWithJacksonJsonHandler() throws Exception {
         Results<Key> result = clientJackson.getKeys();
         Key[] keys = result.getResults();
 
-        assertThat(keys, is(arrayWithSize(2)));
-
         for (Key key : keys) {
             assertThat(key.getKey(), is(notNullValue()));
             assertThat(key.getActions(), is(notNullValue()));