diff --git a/.gitignore b/.gitignore
index 0bdd78e..cc34d89 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,3 @@
 target/
-*.iml
\ No newline at end of file
+*.iml
+.idea/*
diff --git a/pom.xml b/pom.xml
index 787c81e..1c6719a 100644
--- a/pom.xml
+++ b/pom.xml
@@ -19,7 +19,7 @@
     <groupId>com.amazonaws</groupId>
     <artifactId>amazon-neptune-sigv4-signer</artifactId>
     <packaging>jar</packaging>
-    <version>1.0.3</version>
+    <version>1.0.4</version>
 
     <name>amazon-neptune-sigv4-signer</name>
     <description>
diff --git a/src/main/java/com/amazonaws/neptune/auth/NeptuneApacheHttpSigV4Signer.java b/src/main/java/com/amazonaws/neptune/auth/NeptuneApacheHttpSigV4Signer.java
index 578138b..5a85fd0 100644
--- a/src/main/java/com/amazonaws/neptune/auth/NeptuneApacheHttpSigV4Signer.java
+++ b/src/main/java/com/amazonaws/neptune/auth/NeptuneApacheHttpSigV4Signer.java
@@ -36,6 +36,7 @@
 import static com.amazonaws.auth.internal.SignerConstants.AUTHORIZATION;
 import static com.amazonaws.auth.internal.SignerConstants.HOST;
 import static com.amazonaws.auth.internal.SignerConstants.X_AMZ_DATE;
+import static com.amazonaws.auth.internal.SignerConstants.X_AMZ_SECURITY_TOKEN;
 
 /**
  * Signer for HTTP requests made via Apache Commons {@link HttpUriRequest}s.
@@ -173,6 +174,14 @@ protected void attachSignature(final HttpUriRequest request, final NeptuneSigV4S
         request.setHeader(HOST, signature.getHostHeader());
         request.setHeader(X_AMZ_DATE, signature.getXAmzDateHeader());
         request.setHeader(AUTHORIZATION, signature.getAuthorizationHeader());
+
+        // https://docs.aws.amazon.com/general/latest/gr/sigv4-add-signature-to-request.html
+        // For temporary security credentials, it requires an additional HTTP header
+        // or query string parameter for the security token. The name of the header
+        // or query string parameter is X-Amz-Security-Token, and the value is the session token.
+        if (!signature.getSessionToken().isEmpty()) {
+            request.setHeader(X_AMZ_SECURITY_TOKEN, signature.getSessionToken());
+        }
     }
 
 }
diff --git a/src/main/java/com/amazonaws/neptune/auth/NeptuneNettyHttpSigV4Signer.java b/src/main/java/com/amazonaws/neptune/auth/NeptuneNettyHttpSigV4Signer.java
index 85cd4e0..afac3fe 100644
--- a/src/main/java/com/amazonaws/neptune/auth/NeptuneNettyHttpSigV4Signer.java
+++ b/src/main/java/com/amazonaws/neptune/auth/NeptuneNettyHttpSigV4Signer.java
@@ -36,6 +36,7 @@
 import static com.amazonaws.auth.internal.SignerConstants.AUTHORIZATION;
 import static com.amazonaws.auth.internal.SignerConstants.HOST;
 import static com.amazonaws.auth.internal.SignerConstants.X_AMZ_DATE;
+import static com.amazonaws.auth.internal.SignerConstants.X_AMZ_SECURITY_TOKEN;
 
 /**
  * Signer for HTTP requests made via Netty clients {@link FullHttpRequest}s.
@@ -52,7 +53,6 @@ public class NeptuneNettyHttpSigV4Signer extends NeptuneSigV4SignerBase<FullHttp
     public NeptuneNettyHttpSigV4Signer(
             final String regionName, final AWSCredentialsProvider awsCredentialsProvider)
             throws NeptuneSigV4SignerException {
-
         super(regionName, awsCredentialsProvider);
     }
 
@@ -161,5 +161,13 @@ protected void attachSignature(final FullHttpRequest request, final NeptuneSigV4
         request.headers().add(HOST, signature.getHostHeader());
         request.headers().add(X_AMZ_DATE, signature.getXAmzDateHeader());
         request.headers().add(AUTHORIZATION, signature.getAuthorizationHeader());
+
+        // https://docs.aws.amazon.com/general/latest/gr/sigv4-add-signature-to-request.html
+        // For temporary security credentials, it requires an additional HTTP header
+        // or query string parameter for the security token. The name of the header
+        // or query string parameter is X-Amz-Security-Token, and the value is the session token.
+        if (!signature.getSessionToken().isEmpty()) {
+            request.headers().add(X_AMZ_SECURITY_TOKEN, signature.getSessionToken());
+        }
     }
 }
diff --git a/src/main/java/com/amazonaws/neptune/auth/NeptuneRequestMetadataSigV4Signer.java b/src/main/java/com/amazonaws/neptune/auth/NeptuneRequestMetadataSigV4Signer.java
index a273ae8..362d311 100644
--- a/src/main/java/com/amazonaws/neptune/auth/NeptuneRequestMetadataSigV4Signer.java
+++ b/src/main/java/com/amazonaws/neptune/auth/NeptuneRequestMetadataSigV4Signer.java
@@ -30,6 +30,7 @@
 import static com.amazonaws.auth.internal.SignerConstants.AUTHORIZATION;
 import static com.amazonaws.auth.internal.SignerConstants.HOST;
 import static com.amazonaws.auth.internal.SignerConstants.X_AMZ_DATE;
+import static com.amazonaws.auth.internal.SignerConstants.X_AMZ_SECURITY_TOKEN;
 
 /**
  * Signer for HTTP requests encapsulalted in {@link RequestMetadata}s.
@@ -148,6 +149,14 @@ protected void attachSignature(final RequestMetadata request, final NeptuneSigV4
         request.getHeaders().put(HOST, signature.getHostHeader());
         request.getHeaders().put(X_AMZ_DATE, signature.getXAmzDateHeader());
         request.getHeaders().put(AUTHORIZATION, signature.getAuthorizationHeader());
+
+        // https://docs.aws.amazon.com/general/latest/gr/sigv4-add-signature-to-request.html
+        // For temporary security credentials, it requires an additional HTTP header
+        // or query string parameter for the security token. The name of the header
+        // or query string parameter is X-Amz-Security-Token, and the value is the session token.
+        if (!signature.getSessionToken().isEmpty()) {
+            request.getHeaders().put(X_AMZ_SECURITY_TOKEN, signature.getSessionToken());
+        }
     }
 
 }
diff --git a/src/main/java/com/amazonaws/neptune/auth/NeptuneSigV4SignerBase.java b/src/main/java/com/amazonaws/neptune/auth/NeptuneSigV4SignerBase.java
index 75158dc..e6f2a81 100644
--- a/src/main/java/com/amazonaws/neptune/auth/NeptuneSigV4SignerBase.java
+++ b/src/main/java/com/amazonaws/neptune/auth/NeptuneSigV4SignerBase.java
@@ -19,6 +19,7 @@
 import com.amazonaws.SignableRequest;
 import com.amazonaws.auth.AWS4Signer;
 import com.amazonaws.auth.AWSCredentialsProvider;
+import com.amazonaws.auth.BasicSessionCredentials;
 import com.amazonaws.http.HttpMethodName;
 import com.amazonaws.util.SdkHttpUtils;
 
@@ -86,7 +87,6 @@ public NeptuneSigV4SignerBase(
 
         checkNotNull(regionName, "The region name must not be null");
         checkNotNull(awsCredentialsProvider, "The credentials provider must not be null");
-
         this.awsCredentialsProvider = awsCredentialsProvider;
 
         // initialize the signer delegate
@@ -134,7 +134,6 @@ public NeptuneSigV4SignerBase(
     protected abstract void attachSignature(final T nativeRequest, final NeptuneSigV4Signature signature)
             throws NeptuneSigV4SignerException;
 
-
     /**
      * Main logics to sign the request. The scheme is to convert the request into a
      * signable request using toSignableRequest, then sign it using the AWS SDK, and
@@ -159,11 +158,19 @@ public void signRequest(final T request) throws NeptuneSigV4SignerException {
             // 2. Sign the AWS SDK signable request (which internally adds some HTTP headers)
             //    => generic, using the AWS SDK signer
             aws4Signer.sign(awsSignableRequest, awsCredentialsProvider.getCredentials());
+
+            // extract session token if temporary credentials are provided
+            String sessionToken = "";
+            if ((awsCredentialsProvider.getCredentials() instanceof BasicSessionCredentials)) {
+                sessionToken = ((BasicSessionCredentials) awsCredentialsProvider.getCredentials()).getSessionToken();
+            }
+
             final NeptuneSigV4Signature signature =
                     new NeptuneSigV4Signature(
                             awsSignableRequest.getHeaders().get(HOST),
                             awsSignableRequest.getHeaders().get(X_AMZ_DATE),
-                            awsSignableRequest.getHeaders().get(AUTHORIZATION));
+                            awsSignableRequest.getHeaders().get(AUTHORIZATION),
+                            sessionToken);
 
             // 3. Copy over the Signature V4 headers to the original request
             //    => to be implemented in subclass
@@ -306,6 +313,11 @@ public static class NeptuneSigV4Signature {
          */
         private final String authorizationHeader;
 
+        /**
+         * Value of the Temporary credential session token.
+         */
+        private final String sessionToken;
+
 
         /**
          * Constructor.
@@ -315,10 +327,12 @@ public static class NeptuneSigV4Signature {
          * @param authorizationHeader string value of the authorization header used for signing the request
          */
         public NeptuneSigV4Signature(
-                final String hostHeader, final String xAmzDateHeader, final String authorizationHeader) {
+                final String hostHeader, final String xAmzDateHeader, final String authorizationHeader,
+                final String sessionToken) {
             this.hostHeader = hostHeader;
             this.xAmzDateHeader = xAmzDateHeader;
             this.authorizationHeader = authorizationHeader;
+            this.sessionToken = sessionToken;
         }
 
         /**
@@ -341,5 +355,12 @@ public String getXAmzDateHeader() {
         public String getAuthorizationHeader() {
             return authorizationHeader;
         }
+
+        /**
+         * @return the Session Token value
+         */
+        public String getSessionToken() {
+            return sessionToken;
+        }
     }
 }
diff --git a/src/test/java/com/amazonaws/neptune/auth/NeptuneSigV4SignerAbstractTest.java b/src/test/java/com/amazonaws/neptune/auth/NeptuneSigV4SignerAbstractTest.java
index 325ca42..b61149d 100644
--- a/src/test/java/com/amazonaws/neptune/auth/NeptuneSigV4SignerAbstractTest.java
+++ b/src/test/java/com/amazonaws/neptune/auth/NeptuneSigV4SignerAbstractTest.java
@@ -60,6 +60,7 @@ public abstract class NeptuneSigV4SignerAbstractTest<T> {
     protected static final String TEST_QUERY_PARAM_NAME = "query";
     protected static final String TEST_DATE_HEADER_VALUE = "2020/10/04";
     protected static final String TEST_AUTHORIZATION_HEADER_VALUE = "Authorization Header";
+    protected static final String TEST_SESSION_TOKEN_VALUE = "Session Token";
 
     protected final AWSCredentialsProvider awsCredentialsProvider = mock(AWSCredentialsProvider.class);
 
@@ -215,9 +216,7 @@ public void toSignableRequestGetNoHost() throws NeptuneSigV4SignerException {
         signer.toSignableRequest(request);
     }
 
-    @Test
-    public void attachSignatureHeaders() throws Exception {
-
+    private void testAttachSignatureHeaders(final String sessionToken) throws Exception {
         // prep
         final String uri = TEST_FULL_URI_WITH_SLASH;
         final Map<String, String> requestHeaders = new HashMap<>();
@@ -230,7 +229,8 @@ public void attachSignatureHeaders() throws Exception {
         final String dateHeader = TEST_DATE_HEADER_VALUE;
         final String authHeader = TEST_AUTHORIZATION_HEADER_VALUE;
 
-        final NeptuneSigV4SignerBase.NeptuneSigV4Signature signature = new NeptuneSigV4SignerBase.NeptuneSigV4Signature(hostname, dateHeader, authHeader);
+        final NeptuneSigV4SignerBase.NeptuneSigV4Signature signature =
+                new NeptuneSigV4SignerBase.NeptuneSigV4Signature(hostname, dateHeader, authHeader, sessionToken);
         signer.attachSignature(request, signature);
 
         final Map<String, String> attachedHeaders = getRequestHeaders(request);
@@ -240,4 +240,16 @@ public void attachSignatureHeaders() throws Exception {
         assertEquals(HEADER_TWO_VALUE, attachedHeaders.get(HEADER_TWO_NAME));
         assertEquals(authHeader, attachedHeaders.get(SignerConstants.AUTHORIZATION));
     }
+
+    @Test
+    public void attachSignatureHeadersWithSessionToken() throws Exception {
+        final String sessionToken = TEST_SESSION_TOKEN_VALUE;
+        testAttachSignatureHeaders(sessionToken);
+    }
+
+    @Test
+    public void attachSignatureHeadersWithEmptySessionToken() throws Exception {
+        final String sessionToken = "";
+        testAttachSignatureHeaders(sessionToken);
+    }
 }