diff --git a/.github/workflows/deploy.yml b/.github/workflows/deploy.yml
index a39eeabd..4eea30a4 100644
--- a/.github/workflows/deploy.yml
+++ b/.github/workflows/deploy.yml
@@ -10,7 +10,7 @@ permissions:
 
 jobs:
   jar-app:
-    uses: navikt/teamsykmelding-github-actions-workflows/.github/workflows/jar-app.yaml@main
+    uses: navikt/teamsykmelding-github-actions-workflows/.github/workflows/jar-app-21.yaml@main
     secrets: inherit
     with:
       app: syfosmpapirmottak
diff --git a/Dockerfile b/Dockerfile
index 2c502624..894414d8 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM gcr.io/distroless/java17-debian11@sha256:d1ebe3d183e2e6bd09d4fd8f2cf0206693a3bca1858afe393ceb3161b5268f40
+FROM gcr.io/distroless/java21-debian12@sha256:4c79ab242b99bf7ce29f97be45c0c360e3ecd564475becdfcdcc01a3196777ac
 WORKDIR /app
 COPY build/libs/app-*.jar app.jar
 ENV JAVA_OPTS="-Dlogback.configurationFile=logback.xml"
diff --git a/README.md b/README.md
index 850c0beb..31b01a93 100644
--- a/README.md
+++ b/README.md
@@ -10,9 +10,12 @@ This project contains the receiving a paper sykmelding2013 message
 * Kotest
 * Jackson
 
-#### Requirements
-
-* JDK 17
+### Prerequisites
+Make sure you have the Java JDK 21 installed
+You can check which version you have installed using this command:
+``` bash
+java -version
+```
 
 ## FlowChart
 This the high level flow of the application
diff --git a/build.gradle.kts b/build.gradle.kts
index 236d2b1c..fd9b46f0 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -1,3 +1,5 @@
+import org.jetbrains.kotlin.gradle.dsl.JvmTarget
+
 group = "no.nav.syfo"
 version = "1.0.0"
 
@@ -31,6 +33,8 @@ val ktfmtVersion = "0.44"
 val snappyJavaVersion = "1.1.10.5"
 val avroVersion = "1.11.3"
 val diagnosekoderVersion = "1.2024.0"
+val javaVersion = JvmTarget.JVM_21
+val commonsCompressVersion = "1.26.2"
 
 plugins {
     id("application")
@@ -84,6 +88,11 @@ dependencies {
             because("override transient from io.confluent:kafka-avro-serializer")
         }
     }
+    constraints {
+        implementation("org.apache.commons:commons-compress:$commonsCompressVersion") {
+            because("override transient from io.confluent:kafka-avro-serializer")
+        }
+    }
     implementation("no.nav.teamdokumenthandtering:teamdokumenthandtering-avro-schemas:$joarkHendelseVersion")
 
     implementation("no.nav.helse.xml:xmlfellesformat:$syfoXmlCodegenVersion")
@@ -131,6 +140,13 @@ dependencies {
 }
 
 
+kotlin {
+    compilerOptions {
+        jvmTarget = javaVersion
+    }
+}
+
+
 tasks {
 
     shadowJar {
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
index 3fa8f862..a4413138 100644
--- a/gradle/wrapper/gradle-wrapper.properties
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -1,6 +1,6 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-8.4-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.8-bin.zip
 networkTimeout=10000
 validateDistributionUrl=true
 zipStoreBase=GRADLE_USER_HOME
diff --git a/gradlew b/gradlew
index 0adc8e1a..1aa94a42 100755
--- a/gradlew
+++ b/gradlew
@@ -145,7 +145,7 @@ if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
     case $MAX_FD in #(
       max*)
         # In POSIX sh, ulimit -H is undefined. That's why the result is checked to see if it worked.
-        # shellcheck disable=SC3045
+        # shellcheck disable=SC2039,SC3045
         MAX_FD=$( ulimit -H -n ) ||
             warn "Could not query maximum file descriptor limit"
     esac
@@ -153,7 +153,7 @@ if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
       '' | soft) :;; #(
       *)
         # In POSIX sh, ulimit -n is undefined. That's why the result is checked to see if it worked.
-        # shellcheck disable=SC3045
+        # shellcheck disable=SC2039,SC3045
         ulimit -n "$MAX_FD" ||
             warn "Could not set maximum file descriptor limit to $MAX_FD"
     esac
@@ -202,11 +202,11 @@ fi
 # Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
 DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
 
-# Collect all arguments for the java command;
-#   * $DEFAULT_JVM_OPTS, $JAVA_OPTS, and $GRADLE_OPTS can contain fragments of
-#     shell script including quotes and variable substitutions, so put them in
-#     double quotes to make sure that they get re-expanded; and
-#   * put everything else in single quotes, so that it's not re-expanded.
+# Collect all arguments for the java command:
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, JAVA_OPTS, and optsEnvironmentVar are not allowed to contain shell fragments,
+#     and any embedded shellness will be escaped.
+#   * For example: A user cannot expect ${Hostname} to be expanded, as it is an environment variable and will be
+#     treated as '${Hostname}' itself on the command line.
 
 set -- \
         "-Dorg.gradle.appname=$APP_BASE_NAME" \