diff --git a/pom.xml b/pom.xml
index e8c2b94..0e8c3d2 100644
--- a/pom.xml
+++ b/pom.xml
@@ -6,7 +6,7 @@
   <parent>
     <groupId>org.springframework.boot</groupId>
     <artifactId>spring-boot-starter-parent</artifactId>
-    <version>3.1.3</version>
+    <version>3.2.0</version>
     <relativePath/> <!-- lookup parent from repository -->
   </parent>
   <groupId>com.apolloconfig.apollo.ai</groupId>
@@ -16,10 +16,13 @@
   <description>a smart qa bot</description>
   <properties>
     <java.version>17</java.version>
-    <openai-gpt3-java.version>0.16.0</openai-gpt3-java.version>
-    <guava.version>32.1.2-jre</guava.version>
+    <openai-gpt3-java.version>0.18.2</openai-gpt3-java.version>
+    <guava.version>32.1.3-jre</guava.version>
     <flexmark.version>0.64.8</flexmark.version>
-    <milvus.version>2.3.0</milvus.version>
+    <milvus.version>2.3.3</milvus.version>
+    <!-- There is a bug in 4.1.101.Final -->
+    <netty.codec.http2.version>4.1.100.Final</netty.codec.http2.version>
+    <crac.version>1.4.0</crac.version>
   </properties>
 
   <dependencyManagement>
@@ -44,6 +47,16 @@
         <artifactId>milvus-sdk-java</artifactId>
         <version>${milvus.version}</version>
       </dependency>
+      <dependency>
+        <groupId>io.netty</groupId>
+        <artifactId>netty-codec-http2</artifactId>
+        <version>${netty.codec.http2.version}</version>
+      </dependency>
+      <dependency>
+        <groupId>org.crac</groupId>
+        <artifactId>crac</artifactId>
+        <version>${crac.version}</version>
+      </dependency>
     </dependencies>
   </dependencyManagement>
 
@@ -82,6 +95,10 @@
         </exclusion>
       </exclusions>
     </dependency>
+    <dependency>
+      <groupId>org.crac</groupId>
+      <artifactId>crac</artifactId>
+    </dependency>
 
     <dependency>
       <groupId>org.springframework.boot</groupId>
diff --git a/src/main/java/com/apolloconfig/apollo/ai/qabot/milvus/MilvusClientFactory.java b/src/main/java/com/apolloconfig/apollo/ai/qabot/milvus/MilvusClientFactory.java
index 24d685e..43be515 100644
--- a/src/main/java/com/apolloconfig/apollo/ai/qabot/milvus/MilvusClientFactory.java
+++ b/src/main/java/com/apolloconfig/apollo/ai/qabot/milvus/MilvusClientFactory.java
@@ -4,8 +4,10 @@
 import io.milvus.client.MilvusServiceClient;
 import io.milvus.param.ConnectParam;
 import java.util.Map;
+import org.crac.Context;
+import org.crac.Resource;
 
-public class MilvusClientFactory {
+public class MilvusClientFactory implements Resource {
 
   private static final MilvusClientFactory INSTANCE = new MilvusClientFactory();
   private static final Map<String, MilvusServiceClient> clients = Maps.newConcurrentMap();
@@ -43,4 +45,14 @@ private MilvusServiceClient createClient(String host, int port) {
   private MilvusServiceClient createCloudClient(String uri, String token) {
     return new MilvusServiceClient(ConnectParam.newBuilder().withUri(uri).withToken(token).build());
   }
+
+  @Override
+  public void beforeCheckpoint(Context<? extends Resource> context) throws Exception {
+    clients.clear();
+  }
+
+  @Override
+  public void afterRestore(Context<? extends Resource> context) throws Exception {
+
+  }
 }
diff --git a/src/main/java/com/apolloconfig/apollo/ai/qabot/milvus/MilvusService.java b/src/main/java/com/apolloconfig/apollo/ai/qabot/milvus/MilvusService.java
index 6becc6e..e5c541b 100644
--- a/src/main/java/com/apolloconfig/apollo/ai/qabot/milvus/MilvusService.java
+++ b/src/main/java/com/apolloconfig/apollo/ai/qabot/milvus/MilvusService.java
@@ -34,20 +34,30 @@
 import java.util.List;
 import java.util.Random;
 import java.util.stream.Collectors;
+import org.crac.Context;
+import org.crac.Resource;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 import org.springframework.context.annotation.Profile;
 import org.springframework.stereotype.Service;
 import org.springframework.util.CollectionUtils;
 
 @Profile("milvus")
 @Service
-class MilvusService implements VectorDBService {
+class MilvusService implements VectorDBService, Resource {
 
-  private final MilvusServiceClient milvusServiceClient;
+  private static final Logger LOGGER = LoggerFactory.getLogger(MilvusService.class);
+
+  private MilvusServiceClient milvusServiceClient;
   private final MilvusConfig milvusConfig;
   private final List<Float> dummyEmbeddings = Lists.newArrayList();
 
   public MilvusService(MilvusConfig milvusConfig) {
     this.milvusConfig = milvusConfig;
+    this.init();
+  }
+
+  private void init() {
     if (milvusConfig.isUseZillzCloud()) {
       this.milvusServiceClient = MilvusClientFactory.getCloudClient(
           milvusConfig.getZillizCloudUri(),
@@ -413,4 +423,16 @@ private void ensureFileCollection() {
     );
   }
 
+  @Override
+  public void beforeCheckpoint(Context<? extends Resource> context) throws Exception {
+    LOGGER.info("beforeCheckpoint");
+    this.milvusServiceClient = null;
+  }
+
+  @Override
+  public void afterRestore(Context<? extends Resource> context) throws Exception {
+    LOGGER.info("afterRestore");
+    this.init();
+    LOGGER.info("afterRestore done");
+  }
 }
diff --git a/src/main/java/com/apolloconfig/apollo/ai/qabot/openai/OpenAiService.java b/src/main/java/com/apolloconfig/apollo/ai/qabot/openai/OpenAiService.java
index f02028c..c8e2344 100644
--- a/src/main/java/com/apolloconfig/apollo/ai/qabot/openai/OpenAiService.java
+++ b/src/main/java/com/apolloconfig/apollo/ai/qabot/openai/OpenAiService.java
@@ -10,19 +10,25 @@
 import com.theokanning.openai.embedding.EmbeddingRequest;
 import io.reactivex.Flowable;
 import java.util.List;
+import org.crac.Context;
+import org.crac.Resource;
 import org.springframework.context.annotation.Profile;
 import org.springframework.stereotype.Component;
 
 @Profile("openai")
 @Component
-class OpenAiService implements AiService {
+class OpenAiService implements AiService, Resource {
 
   private static final String DEFAULT_MODEL = "gpt-3.5-turbo";
   private static final String DEFAULT_EMBEDDING_MODEL = "text-embedding-ada-002";
 
-  private final com.theokanning.openai.service.OpenAiService service;
+  private com.theokanning.openai.service.OpenAiService service;
 
   public OpenAiService() {
+    init();
+  }
+
+  private void init() {
     service = OpenAiServiceFactory.getService(System.getenv("OPENAI_API_KEY"));
   }
 
@@ -60,4 +66,14 @@ public List<Embedding> getEmbeddings(List<String> chunks) {
 
     return service.createEmbeddings(embeddingRequest).getData();
   }
+
+  @Override
+  public void beforeCheckpoint(Context<? extends Resource> context) throws Exception {
+    this.service = null;
+  }
+
+  @Override
+  public void afterRestore(Context<? extends Resource> context) throws Exception {
+    this.init();
+  }
 }
diff --git a/src/main/java/com/apolloconfig/apollo/ai/qabot/openai/OpenAiServiceFactory.java b/src/main/java/com/apolloconfig/apollo/ai/qabot/openai/OpenAiServiceFactory.java
index 1d67662..770b979 100644
--- a/src/main/java/com/apolloconfig/apollo/ai/qabot/openai/OpenAiServiceFactory.java
+++ b/src/main/java/com/apolloconfig/apollo/ai/qabot/openai/OpenAiServiceFactory.java
@@ -23,9 +23,11 @@
 import okhttp3.Authenticator;
 import okhttp3.Credentials;
 import okhttp3.OkHttpClient;
+import org.crac.Context;
+import org.crac.Resource;
 import retrofit2.Retrofit;
 
-public class OpenAiServiceFactory {
+public class OpenAiServiceFactory implements Resource {
 
   private static final Duration DEFAULT_TIMEOUT = Duration.ofSeconds(60);
 
@@ -85,6 +87,16 @@ private OkHttpClient client(String apiKey) {
         .build();
   }
 
+  @Override
+  public void beforeCheckpoint(Context<? extends Resource> context) throws Exception {
+    SERVICES.clear();
+  }
+
+  @Override
+  public void afterRestore(Context<? extends Resource> context) throws Exception {
+
+  }
+
   private static class DelegatingSocketFactory extends SocketFactory {
 
     private final SocketFactory delegate;
diff --git a/src/main/scripts/startup.sh b/src/main/scripts/startup.sh
index 77f1b54..00a2130 100644
--- a/src/main/scripts/startup.sh
+++ b/src/main/scripts/startup.sh
@@ -19,13 +19,27 @@ SERVICE_NAME=qa-bot
 LOG_DIR=/opt/logs
 ## Adjust server port if necessary
 SERVER_PORT=${SERVER_PORT:=9090}
+## Adjust crac files dir if necessary
+CRAC_FILES_DIR=/opt/crac
 
 ## Create log directory if not existed because JDK 8+ won't do that
 mkdir -p $LOG_DIR
 
+mkdir -p $CRAC_FILES_DIR
+
 ## Adjust memory settings if necessary
 #export JAVA_OPTS="-Xms2560m -Xmx2560m -Xss256k -XX:MetaspaceSize=128m -XX:MaxMetaspaceSize=384m -XX:NewSize=1536m -XX:MaxNewSize=1536m -XX:SurvivorRatio=8"
 
+# Check for 'checkpoint' argument
+if [ "$1" = "checkpoint" ]; then
+    export JAVA_OPTS="$JAVA_OPTS -Dspring.context.checkpoint=onRefresh -XX:CRaCCheckpointTo=$CRAC_FILES_DIR"
+fi
+
+# Check for 'restore' argument
+if [ "$1" = "restore" ]; then
+    export JAVA_OPTS="$JAVA_OPTS -XX:CRaCRestoreFrom=$CRAC_FILES_DIR"
+fi
+
 ## Only uncomment the following when you are using server jvm
 export JAVA_OPTS="$JAVA_OPTS -server -XX:-ReduceInitialCardMarks"