diff --git a/CHANGELOG.md b/CHANGELOG.md
index 53849ca..fbcc81d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,10 @@
 
 All notable changes to this project will be documented in this file.
 
+## 1.4.5 - 2023-11-13
+- Adjust timeout to not have lingering sessions on HMC
+- Update 3rd party dependencies
+
 ## 1.4.4 - 2023-05-20
 - Support for InfluxDB v2, now requires InfluxDB 1.8 or later
 - Increase influx writer buffer limit
diff --git a/build.gradle b/build.gradle
index 57476aa..486c2e8 100644
--- a/build.gradle
+++ b/build.gradle
@@ -4,7 +4,7 @@ plugins {
     id 'groovy'
     id 'application'
     id "net.nemerosa.versioning" version "2.15.1"
-    id "com.netflix.nebula.ospackage" version "11.2.0"
+    id "com.netflix.nebula.ospackage" version "11.5.0"
     id "com.github.johnrengelman.shadow" version "7.1.2"
 }
 
@@ -17,15 +17,15 @@ group = projectGroup
 version = projectVersion
 
 dependencies {
-    annotationProcessor 'info.picocli:picocli-codegen:4.7.3'
-    implementation 'info.picocli:picocli:4.7.3'
-    implementation 'org.slf4j:slf4j-api:2.0.7'
-    implementation 'org.slf4j:slf4j-simple:2.0.7'
-    implementation 'com.squareup.okhttp3:okhttp:4.10.0' // Also used by InfluxDB Client
-    implementation 'com.influxdb:influxdb-client-java:6.8.0'
-    implementation 'com.fasterxml.jackson.core:jackson-databind:2.14.3'
-    implementation 'com.fasterxml.jackson.dataformat:jackson-dataformat-xml:2.14.3'
-    implementation 'com.fasterxml.jackson.dataformat:jackson-dataformat-toml:2.14.3'
+    annotationProcessor 'info.picocli:picocli-codegen:4.7.5'
+    implementation 'info.picocli:picocli:4.7.5'
+    implementation 'org.slf4j:slf4j-api:2.0.9'
+    implementation 'org.slf4j:slf4j-simple:2.0.9'
+    implementation 'com.squareup.okhttp3:okhttp:4.11.0' // Also used by InfluxDB Client
+    implementation 'com.influxdb:influxdb-client-java:6.10.0'
+    implementation 'com.fasterxml.jackson.core:jackson-databind:2.15.2'
+    implementation 'com.fasterxml.jackson.dataformat:jackson-dataformat-xml:2.15.2'
+    implementation 'com.fasterxml.jackson.dataformat:jackson-dataformat-toml:2.15.2'
 
     testImplementation 'junit:junit:4.13.2'
     testImplementation 'org.spockframework:spock-core:2.3-groovy-4.0'
diff --git a/doc/readme-hmc.md b/doc/readme-hmc.md
index 610c6be..6b889fe 100644
--- a/doc/readme-hmc.md
+++ b/doc/readme-hmc.md
@@ -11,9 +11,9 @@ Ensure you have **correct date/time** and NTPd running to keep it accurate!
 - Navigate to *Users and Security*
     - Create a new read-only/viewer **hmci** user, which will be used to connect to the HMC.
     - Click *Manage User Profiles and Access*, edit the newly created *hmci* user and click *User Properties*:
-        - Set *Session timeout minutes* to **60**
+        - Set *Session timeout minutes* to **120** (or at least 61 minutes)
         - Set *Verify timeout minutes* to **15**
-        - Set *Idle timeout minutes* to **90**
+        - Set *Idle timeout minutes* to **15**
         - Set *Minimum time in days between password changes* to **0**
         - **Enable** *Allow remote access via the web*
 - Navigate to *HMC Management* and *Console Settings*
diff --git a/gradle.properties b/gradle.properties
index 91253d0..842f543 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -1,3 +1,3 @@
 projectId               = hmci
 projectGroup            = biz.nellemann.hmci
-projectVersion          = 1.4.4
+projectVersion          = 1.4.5
diff --git a/src/main/java/biz/nellemann/hmci/Application.java b/src/main/java/biz/nellemann/hmci/Application.java
index 9b6abb4..135ce28 100644
--- a/src/main/java/biz/nellemann/hmci/Application.java
+++ b/src/main/java/biz/nellemann/hmci/Application.java
@@ -15,17 +15,19 @@
  */
 package biz.nellemann.hmci;
 
-import biz.nellemann.hmci.dto.toml.Configuration;
-import com.fasterxml.jackson.dataformat.toml.TomlMapper;
-import picocli.CommandLine;
-import picocli.CommandLine.Option;
-import picocli.CommandLine.Command;
-
 import java.io.File;
+import java.io.IOException;
 import java.util.ArrayList;
 import java.util.List;
 import java.util.concurrent.Callable;
 
+import com.fasterxml.jackson.dataformat.toml.TomlMapper;
+
+import biz.nellemann.hmci.dto.toml.Configuration;
+import picocli.CommandLine;
+import picocli.CommandLine.Command;
+import picocli.CommandLine.Option;
+
 @Command(name = "hmci",
     mixinStandardHelpOptions = true,
     versionProvider = biz.nellemann.hmci.VersionProvider.class,
@@ -90,7 +92,7 @@ public class Application implements Callable<Integer> {
             }
 
             influxClient.logoff();
-        } catch (Exception e) {
+        } catch (IOException | InterruptedException e) {
             System.err.println(e.getMessage());
             return 1;
         }
diff --git a/src/main/java/biz/nellemann/hmci/InfluxClient.java b/src/main/java/biz/nellemann/hmci/InfluxClient.java
index 90803b7..ae63e80 100644
--- a/src/main/java/biz/nellemann/hmci/InfluxClient.java
+++ b/src/main/java/biz/nellemann/hmci/InfluxClient.java
@@ -15,20 +15,21 @@
  */
 package biz.nellemann.hmci;
 
-import biz.nellemann.hmci.dto.toml.InfluxConfiguration;
+import static java.lang.Thread.sleep;
+import java.util.ArrayList;
+import java.util.List;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
 import com.influxdb.client.InfluxDBClient;
 import com.influxdb.client.InfluxDBClientFactory;
 import com.influxdb.client.WriteApi;
 import com.influxdb.client.WriteOptions;
-import com.influxdb.client.write.Point;
 import com.influxdb.client.domain.WritePrecision;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
+import com.influxdb.client.write.Point;
 
-import java.util.ArrayList;
-import java.util.List;
-
-import static java.lang.Thread.sleep;
+import biz.nellemann.hmci.dto.toml.InfluxConfiguration;
 
 
 public final class InfluxClient {
@@ -83,10 +84,10 @@ public final class InfluxClient {
                 Runtime.getRuntime().addShutdownHook(new Thread(influxDBClient::close));
 
                 // Todo: Handle events - https://github.com/influxdata/influxdb-client-java/tree/master/client#handle-the-events
-                //writeApi = influxDBClient.makeWriteApi();
                 writeApi = influxDBClient.makeWriteApi(
                     WriteOptions.builder()
-                        .bufferLimit(20_000)
+                        .batchSize(15_000)
+                        .bufferLimit(500_000)
                         .flushInterval(5_000)
                         .build());
 
diff --git a/src/main/java/biz/nellemann/hmci/ManagementConsole.java b/src/main/java/biz/nellemann/hmci/ManagementConsole.java
index c0fe494..c2fc0fe 100644
--- a/src/main/java/biz/nellemann/hmci/ManagementConsole.java
+++ b/src/main/java/biz/nellemann/hmci/ManagementConsole.java
@@ -15,21 +15,25 @@
  */
 package biz.nellemann.hmci;
 
+import java.io.IOException;
+import static java.lang.Thread.sleep;
+import java.time.Duration;
+import java.time.Instant;
+import java.time.temporal.ChronoUnit;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Objects;
+import java.util.concurrent.atomic.AtomicBoolean;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import com.fasterxml.jackson.dataformat.xml.XmlMapper;
+
 import biz.nellemann.hmci.dto.toml.HmcConfiguration;
 import biz.nellemann.hmci.dto.xml.Link;
 import biz.nellemann.hmci.dto.xml.ManagementConsoleEntry;
 import biz.nellemann.hmci.dto.xml.XmlFeed;
-import com.fasterxml.jackson.dataformat.xml.XmlMapper;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
-
-import java.time.Duration;
-import java.time.Instant;
-import java.time.temporal.ChronoUnit;
-import java.util.*;
-import java.util.concurrent.atomic.AtomicBoolean;
-
-import static java.lang.Thread.sleep;
 
 class ManagementConsole implements Runnable {
 
@@ -170,7 +174,7 @@ class ManagementConsole implements Runnable {
                 }
             }
 
-        } catch (Exception e) {
+        } catch (IOException e) {
             log.warn("discover() - error: {}", e.getMessage());
         }
 
diff --git a/src/main/java/biz/nellemann/hmci/RestClient.java b/src/main/java/biz/nellemann/hmci/RestClient.java
index 3a3567b..cc4ff85 100644
--- a/src/main/java/biz/nellemann/hmci/RestClient.java
+++ b/src/main/java/biz/nellemann/hmci/RestClient.java
@@ -1,23 +1,33 @@
 package biz.nellemann.hmci;
 
-import biz.nellemann.hmci.dto.xml.LogonResponse;
-import com.fasterxml.jackson.dataformat.xml.XmlMapper;
-import okhttp3.*;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
+import java.io.IOException;
+import java.net.MalformedURLException;
+import java.net.URL;
+import java.security.KeyManagementException;
+import java.security.NoSuchAlgorithmException;
+import java.security.SecureRandom;
+import java.security.cert.X509Certificate;
+import java.time.Instant;
+import java.time.temporal.ChronoUnit;
+import java.util.Objects;
+import java.util.concurrent.TimeUnit;
 
 import javax.net.ssl.SSLContext;
 import javax.net.ssl.SSLSocketFactory;
 import javax.net.ssl.TrustManager;
 import javax.net.ssl.X509TrustManager;
-import java.io.*;
-import java.net.*;
-import java.security.KeyManagementException;
-import java.security.NoSuchAlgorithmException;
-import java.security.SecureRandom;
-import java.security.cert.X509Certificate;
-import java.util.Objects;
-import java.util.concurrent.TimeUnit;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import com.fasterxml.jackson.dataformat.xml.XmlMapper;
+
+import biz.nellemann.hmci.dto.xml.LogonResponse;
+import okhttp3.MediaType;
+import okhttp3.OkHttpClient;
+import okhttp3.Request;
+import okhttp3.RequestBody;
+import okhttp3.Response;
 
 public class RestClient {
 
@@ -38,6 +48,9 @@ public class RestClient {
     protected final String username;
     protected final String password;
 
+    private final static int MAX_MINUTES_BETWEEN_AUTHENTICATION = 60; // TODO: Make configurable and match HMC timeout settings
+    private Instant lastAuthenticationTimestamp;
+
 
     public RestClient(String baseUrl, String username, String password, Boolean trustAll) {
         this.baseUrl = baseUrl;
@@ -63,6 +76,8 @@ public class RestClient {
                 log.error("ManagementConsole() - trace error: " + e.getMessage());
             }
         }*/
+        Thread shutdownHook = new Thread(this::logoff);
+        Runtime.getRuntime().addShutdownHook(shutdownHook);
     }
 
 
@@ -70,6 +85,9 @@ public class RestClient {
      * Logon to the HMC and get an authentication token for further requests.
      */
     public synchronized void login() {
+        if(authToken != null) {
+            logoff();
+        }
 
         log.info("Connecting to HMC - {} @ {}", username, baseUrl);
         StringBuilder payload = new StringBuilder();
@@ -102,10 +120,12 @@ public class RestClient {
             LogonResponse logonResponse = xmlMapper.readValue(responseBody, LogonResponse.class);
 
             authToken = logonResponse.getToken();
+            lastAuthenticationTimestamp = Instant.now();
             log.debug("logon() - auth token: {}", authToken);
 
         } catch (Exception e) {
             log.warn("logon() - error: {}", e.getMessage());
+            lastAuthenticationTimestamp = null;
         }
 
     }
@@ -136,6 +156,7 @@ public class RestClient {
                 log.warn("logoff() error: {}", e.getMessage());
             } finally {
                 authToken = null;
+                lastAuthenticationTimestamp = null;
             }
 
         } catch (MalformedURLException e) {
@@ -160,10 +181,14 @@ public class RestClient {
      * Return a Response from the HMC
      * @param url to get Response from
      * @return Response body string
+     * @throws IOException
      */
     public synchronized String getRequest(URL url) throws IOException {
 
         log.debug("getRequest() - URL: {}", url.toString());
+        if (lastAuthenticationTimestamp == null || lastAuthenticationTimestamp.plus(MAX_MINUTES_BETWEEN_AUTHENTICATION, ChronoUnit.MINUTES).isBefore(Instant.now())) {
+            login();
+        }
 
         Request request = new Request.Builder()
             .url(url)
@@ -218,10 +243,18 @@ public class RestClient {
 
     /**
      * Send a POST request with a payload (can be null) to the HMC
+     * @param url
+     * @param payload
+     * @return Response body string
+     * @throws IOException
      */
     public synchronized String postRequest(URL url, String payload) throws IOException {
 
         log.debug("sendPostRequest() - URL: {}", url.toString());
+        if (lastAuthenticationTimestamp == null || lastAuthenticationTimestamp.plus(MAX_MINUTES_BETWEEN_AUTHENTICATION, ChronoUnit.MINUTES).isBefore(Instant.now())) {
+            login();
+        }
+
         RequestBody requestBody;
         if(payload != null) {
             requestBody = RequestBody.create(payload, MEDIA_TYPE_IBM_XML_POST);
diff --git a/src/main/java/biz/nellemann/hmci/SystemEnergy.java b/src/main/java/biz/nellemann/hmci/SystemEnergy.java
index f97f26a..fb28eeb 100644
--- a/src/main/java/biz/nellemann/hmci/SystemEnergy.java
+++ b/src/main/java/biz/nellemann/hmci/SystemEnergy.java
@@ -1,14 +1,20 @@
 package biz.nellemann.hmci;
 
-import biz.nellemann.hmci.dto.xml.Link;
-import biz.nellemann.hmci.dto.xml.XmlFeed;
-import com.fasterxml.jackson.dataformat.xml.XmlMapper;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
-
 import java.io.IOException;
 import java.net.URI;
-import java.util.*;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Objects;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import com.fasterxml.jackson.dataformat.xml.XmlMapper;
+
+import biz.nellemann.hmci.dto.xml.Link;
+import biz.nellemann.hmci.dto.xml.XmlFeed;
 
 class SystemEnergy extends Resource {
 
diff --git a/src/main/java/biz/nellemann/hmci/VersionProvider.java b/src/main/java/biz/nellemann/hmci/VersionProvider.java
index 0651de2..ec3a974 100644
--- a/src/main/java/biz/nellemann/hmci/VersionProvider.java
+++ b/src/main/java/biz/nellemann/hmci/VersionProvider.java
@@ -15,12 +15,12 @@
  */
 package biz.nellemann.hmci;
 
-import picocli.CommandLine;
-
 import java.io.IOException;
 import java.util.jar.Attributes;
 import java.util.jar.Manifest;
 
+import picocli.CommandLine;
+
 class VersionProvider implements CommandLine.IVersionProvider {
 
     @Override
diff --git a/src/main/java/biz/nellemann/hmci/VirtualIOServer.java b/src/main/java/biz/nellemann/hmci/VirtualIOServer.java
index 62a94ee..f7d0e86 100644
--- a/src/main/java/biz/nellemann/hmci/VirtualIOServer.java
+++ b/src/main/java/biz/nellemann/hmci/VirtualIOServer.java
@@ -1,13 +1,16 @@
 package biz.nellemann.hmci;
 
-import biz.nellemann.hmci.dto.xml.VirtualIOServerEntry;
-import biz.nellemann.hmci.dto.xml.XmlEntry;
-import com.fasterxml.jackson.dataformat.xml.XmlMapper;
+import java.io.IOException;
+import java.net.URI;
+import java.net.URISyntaxException;
+
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
-import java.net.URI;
-import java.net.URISyntaxException;
+import com.fasterxml.jackson.dataformat.xml.XmlMapper;
+
+import biz.nellemann.hmci.dto.xml.VirtualIOServerEntry;
+import biz.nellemann.hmci.dto.xml.XmlEntry;
 
 public class VirtualIOServer {
     private final static Logger log = LoggerFactory.getLogger(VirtualIOServer.class);
@@ -58,7 +61,7 @@ public class VirtualIOServer {
                 throw new UnsupportedOperationException("Failed to deserialize VirtualIOServer");
             }
 
-        } catch (Exception e) {
+        } catch (IOException e) {
             log.error("discover() - error: {}", e.getMessage());
         }
     }
diff --git a/src/main/java/biz/nellemann/hmci/dto/json/PowerUtil.java b/src/main/java/biz/nellemann/hmci/dto/json/PowerUtil.java
index ab028eb..f77f9aa 100644
--- a/src/main/java/biz/nellemann/hmci/dto/json/PowerUtil.java
+++ b/src/main/java/biz/nellemann/hmci/dto/json/PowerUtil.java
@@ -5,6 +5,6 @@ import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
 @JsonIgnoreProperties(ignoreUnknown = true)
 public final class PowerUtil {
 
-    public Number powerReading = 0.0;
+    public float powerReading = 0.0F;
 
 }
diff --git a/src/test/groovy/biz/nellemann/hmci/LogicalPartitionTest.groovy b/src/test/groovy/biz/nellemann/hmci/LogicalPartitionTest.groovy
index 6367cfc..92c4866 100644
--- a/src/test/groovy/biz/nellemann/hmci/LogicalPartitionTest.groovy
+++ b/src/test/groovy/biz/nellemann/hmci/LogicalPartitionTest.groovy
@@ -52,6 +52,7 @@ class LogicalPartitionTest extends Specification {
     }
 
     def cleanupSpec() {
+        serviceClient.logoff()
         mockServer.stop()
     }
 
diff --git a/src/test/groovy/biz/nellemann/hmci/ManagedSystemTest.groovy b/src/test/groovy/biz/nellemann/hmci/ManagedSystemTest.groovy
index 88f1cdc..3cf0ca6 100644
--- a/src/test/groovy/biz/nellemann/hmci/ManagedSystemTest.groovy
+++ b/src/test/groovy/biz/nellemann/hmci/ManagedSystemTest.groovy
@@ -42,6 +42,7 @@ class ManagedSystemTest extends Specification {
     }
 
     def cleanupSpec() {
+        serviceClient.logoff()
         mockServer.stop()
     }