diff --git a/.github/workflows/deploy-to-dev.yaml b/.github/workflows/deploy-to-dev.yaml
index 1f94435..7439692 100644
--- a/.github/workflows/deploy-to-dev.yaml
+++ b/.github/workflows/deploy-to-dev.yaml
@@ -34,10 +34,10 @@ jobs:
           restore-keys: |
             ${{ runner.os }}-gradle-
 
-      - name: Install Java 17
+      - name: Install Java 21
         uses: actions/setup-java@v4
         with:
-          java-version: 17
+          java-version: 21
           distribution: temurin
 
       - name: Test and build
diff --git a/.github/workflows/pull-requests.yaml b/.github/workflows/pull-requests.yaml
index 1d06e01..2708545 100644
--- a/.github/workflows/pull-requests.yaml
+++ b/.github/workflows/pull-requests.yaml
@@ -13,10 +13,10 @@ jobs:
           key: ${{ runner.os }}-gradle-${{ hashFiles('**/*.gradle.kts') }}
           restore-keys: |
             ${{ runner.os }}-gradle-
-      - name: Install Java 17
+      - name: Install Java 21
         uses: actions/setup-java@main
         with:
-          java-version: 17
+          java-version: 21
           distribution: temurin
       - name: test and build
         run: ./gradlew test build
diff --git a/Dockerfile b/Dockerfile
index 588657f..b72385b 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM gcr.io/distroless/java17-debian12:latest
+FROM gcr.io/distroless/java21-debian12:nonroot
 ENV TZ="Europe/Oslo"
 
 COPY build/libs/app.jar /app/app.jar
diff --git a/build.gradle.kts b/build.gradle.kts
index 53b6e83..6b29d48 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -68,12 +68,12 @@ idea {
     }
 }
 
-java.sourceCompatibility = JavaVersion.VERSION_17
+java.sourceCompatibility = JavaVersion.VERSION_21
 
 tasks.withType<KotlinCompile> {
     kotlinOptions {
         freeCompilerArgs = listOf("-Xjsr305=strict")
-        jvmTarget = "17"
+        jvmTarget = "21"
     }
 }
 
diff --git a/src/main/kotlin/no/nav/klage/util/TokenUtil.kt b/src/main/kotlin/no/nav/klage/util/TokenUtil.kt
index 151fecc..674b096 100644
--- a/src/main/kotlin/no/nav/klage/util/TokenUtil.kt
+++ b/src/main/kotlin/no/nav/klage/util/TokenUtil.kt
@@ -10,26 +10,26 @@ class TokenUtil(
     private val oAuth2AccessTokenService: OAuth2AccessTokenService,
 ) {
     fun getAppAccessTokenWithDokarkivScope(): String {
-        val clientProperties = clientConfigurationProperties.registration["dokarkiv-maskintilmaskin"]
+        val clientProperties = clientConfigurationProperties.registration["dokarkiv-maskintilmaskin"]!!
         val response = oAuth2AccessTokenService.getAccessToken(clientProperties)
-        return response.accessToken
+        return response.accessToken!!
     }
 
     fun getAppAccessTokenWithKlageFileApiScope(): String {
-        val clientProperties = clientConfigurationProperties.registration["klage-file-api-maskintilmaskin"]
+        val clientProperties = clientConfigurationProperties.registration["klage-file-api-maskintilmaskin"]!!
         val response = oAuth2AccessTokenService.getAccessToken(clientProperties)
-        return response.accessToken
+        return response.accessToken!!
     }
 
     fun getAppAccessTokenWithKlageDittnavApiScope(): String {
-        val clientProperties = clientConfigurationProperties.registration["klage-dittnav-api-maskintilmaskin"]
+        val clientProperties = clientConfigurationProperties.registration["klage-dittnav-api-maskintilmaskin"]!!
         val response = oAuth2AccessTokenService.getAccessToken(clientProperties)
-        return response.accessToken
+        return response.accessToken!!
     }
 
     fun getAppAccessTokenWithPdlScope(): String {
-        val clientProperties = clientConfigurationProperties.registration["pdl-maskintilmaskin"]
+        val clientProperties = clientConfigurationProperties.registration["pdl-maskintilmaskin"]!!
         val response = oAuth2AccessTokenService.getAccessToken(clientProperties)
-        return response.accessToken
+        return response.accessToken!!
     }
 }
\ No newline at end of file