diff --git a/appveyor.yml b/appveyor.yml
index 40cdc56..b43f986 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -14,7 +14,7 @@ init:
 skip_tags: true
 
 environment:
-  JAVA_HOME: C:\Program Files\Java\jdk1.8.0
+  JAVA_HOME: C:\Program Files\Java\jdk17
   M2: $(USERPROFILE)\.m2
 
 install:
diff --git a/pom.xml b/pom.xml
index 84234b0..85fe37e 100644
--- a/pom.xml
+++ b/pom.xml
@@ -44,7 +44,7 @@
   </developers>
 
   <properties>
-    <java.version>1.8</java.version>
+    <java.version>17</java.version>
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
     <revision>1.0.0-SNAPSHOT</revision>
   </properties>
@@ -67,7 +67,7 @@
     <dependency>
       <groupId>org.apache.tika</groupId>
       <artifactId>tika-core</artifactId>
-      <version>2.9.4</version>
+      <version>3.2.3</version>
     </dependency>
     <dependency>
       <groupId>com.google.code.gson</groupId>
@@ -94,7 +94,7 @@
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-compiler-plugin</artifactId>
-        <version>3.5</version>
+        <version>3.11.0</version>
         <configuration>
           <source>${java.version}</source>
           <target>${java.version}</target>
diff --git a/src/main/java/com/aquaticinformatics/aquarius/sdk/timeseries/AquariusClient.java b/src/main/java/com/aquaticinformatics/aquarius/sdk/timeseries/AquariusClient.java
index 01f077f..7bc6de4 100644
--- a/src/main/java/com/aquaticinformatics/aquarius/sdk/timeseries/AquariusClient.java
+++ b/src/main/java/com/aquaticinformatics/aquarius/sdk/timeseries/AquariusClient.java
@@ -11,7 +11,6 @@
 import org.xml.sax.InputSource;
 
 import javax.crypto.Cipher;
-import javax.xml.bind.DatatypeConverter;
 import javax.xml.parsers.DocumentBuilder;
 import javax.xml.parsers.DocumentBuilderFactory;
 import javax.xml.xpath.XPath;
@@ -25,6 +24,7 @@
 import java.security.spec.RSAPublicKeySpec;
 import java.time.Duration;
 import java.time.Instant;
+import java.util.Base64;
 import java.util.HashMap;
 import java.util.Map;
 
@@ -142,8 +142,8 @@ private String getEncryptedPassword(String plaintextPassword) {
             String modulusText = xpath.evaluate("/RSAKeyValue/Modulus", document);
             String exponentText = xpath.evaluate("/RSAKeyValue/Exponent", document);
 
-            byte[] modulusByes = DatatypeConverter.parseBase64Binary(modulusText);
-            byte[] exponentBytes = DatatypeConverter.parseBase64Binary(exponentText);
+            byte[] modulusByes = Base64.getDecoder().decode(modulusText);
+            byte[] exponentBytes = Base64.getDecoder().decode(exponentText);
 
             BigInteger modulus = new BigInteger(1, modulusByes);
             BigInteger exponent = new BigInteger(1, exponentBytes);
@@ -159,7 +159,7 @@ private String getEncryptedPassword(String plaintextPassword) {
 
             // And finally, you can transform the blob into a base-64 string to assign the to
             // the EncryptedPassword property of the login DTO:
-            return DatatypeConverter.printBase64Binary(encryptedPasswordBlob);
+            return Base64.getEncoder().encodeToString(encryptedPasswordBlob);
         }
         catch(Exception e) {
             return plaintextPassword;
diff --git a/src/test/java/com/aquaticinformatics/aquarius/sdk/samples/SamplesClientTest.java b/src/test/java/com/aquaticinformatics/aquarius/sdk/samples/SamplesClientTest.java
index c884223..6c29334 100644
--- a/src/test/java/com/aquaticinformatics/aquarius/sdk/samples/SamplesClientTest.java
+++ b/src/test/java/com/aquaticinformatics/aquarius/sdk/samples/SamplesClientTest.java
@@ -1,7 +1,12 @@
 package com.aquaticinformatics.aquarius.sdk.samples;
 
+import java.io.File;
+import java.util.List;
+import java.util.Objects;
+import java.util.UUID;
 
 import junitparams.JUnitParamsRunner;
+
 import org.junit.Assert;
 import org.junit.Before;
 import org.junit.Rule;
@@ -10,6 +15,9 @@
 import org.junit.runner.RunWith;
 import org.junit.experimental.categories.Category;
 
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNotNull;
+
 @Category(TestRequiresCredentials.class)
 @RunWith(JUnitParamsRunner.class)
 public class SamplesClientTest {
@@ -47,4 +55,56 @@ public void GetLabs_ConnectedClient_ReturnsSearchResultLaboratory() {
         System.out.printf("Found %d laboratories\n", searchResultLaboratory.TotalCount);
     }
 
+
+    @Test
+    public void PostLocation_ConnectedClient_IsSuccessful() {
+        ServiceModel.PostSamplingLocation request = new ServiceModel.PostSamplingLocation();
+        String locationId = "location customId" + UUID.randomUUID();
+        request.CustomId = locationId;
+        ServiceModel.SamplingLocation post = client.Api.post(request);
+        assertEquals(post.getCustomId(), locationId);
+    }
+
+
+    @Test
+    public void PostUploadAttachment_WithCsvFile_IsSuccessfulAndSetsCorrectMimeType() {
+        ServiceModel.PostUploadAttachment postUploadAttachment = new ServiceModel.PostUploadAttachment();
+        File file = new File("src/test/resources/test-csv-attachment.csv");
+        ServiceModel.AttachmentRepresentation attachmentRepresentation = client.postFileWithRequest(file, postUploadAttachment);
+
+        assertEquals(true, attachmentRepresentation.Success);
+        assertEquals("text/csv", attachmentRepresentation.ContentType);
+        assertEquals("test-csv-attachment.csv", attachmentRepresentation.FileName);
+    }
+
+    @Test
+    public void PostLocationAttachment_WithAttachment_IsSuccessful() {
+        ServiceModel.PostUploadAttachment postUploadAttachment = new ServiceModel.PostUploadAttachment();
+        File file = new File("src/test/resources/test-csv-attachment.csv");
+        ServiceModel.AttachmentRepresentation attachmentRepresentation = client.postFileWithRequest(file, postUploadAttachment);
+
+        ServiceModel.PostSamplingLocation postSamplingLocation = new ServiceModel.PostSamplingLocation();
+        postSamplingLocation.CustomId = UUID.randomUUID().toString();
+        ServiceModel.DomainObjectAttachment e1 = mapToDomainObjectAttachment(attachmentRepresentation);
+        postSamplingLocation.Attachments = List.of(e1);
+        ServiceModel.SamplingLocation post = client.Api.post(postSamplingLocation);
+        assertEquals(1, post.Attachments.size());
+        ServiceModel.Attachment firstAttachment = post.getAttachments().get(0).getAttachment();
+        assertEquals("test-csv-attachment.csv", firstAttachment.FileName);
+
+    }
+
+    private static ServiceModel.DomainObjectAttachment mapToDomainObjectAttachment(ServiceModel.AttachmentRepresentation from) {
+        ServiceModel.DomainObjectAttachment e1 =
+                new ServiceModel.DomainObjectAttachment();
+        e1.Id = from.getId();
+        ServiceModel.Attachment to = new ServiceModel.Attachment();
+        to.setId(from.getId());
+        to.setFileSize(from.getFileSize());
+        to.setFileName(from.getFileName());
+        to.setContentType(from.getContentType());
+        to.setFileSize(from.getFileSize());
+        e1.Attachment = to;
+        return e1;
+    }
 }
diff --git a/src/test/resources/test-csv-attachment.csv b/src/test/resources/test-csv-attachment.csv
new file mode 100644
index 0000000..ffb5e18
--- /dev/null
+++ b/src/test/resources/test-csv-attachment.csv
@@ -0,0 +1,2 @@
+Header1,Header2
+a,b