diff --git a/.github/renovate.json5 b/.github/renovate.json5
index 08311b7..5d6fcf3 100644
--- a/.github/renovate.json5
+++ b/.github/renovate.json5
@@ -12,24 +12,9 @@
   // Note: if the rule feels generic enough, should consider adding it to the jore4 default preset
   packageRules: [
     {
-      // restrict spring boot updates to <4 versions for now.
-      // Maven depName is "groupId:artifactId", so match with a glob to also catch
-      // spring-boot-starter-parent (a plain "org.springframework.boot" does not match it).
-      groupName: "spring boot",
-      groupSlug: "spring-boot",
-      matchPackageNames: ["org.springframework.boot:**"],
-      allowedVersions: "<4",
-    },
-    {
-      // java-jdk 25 needs Kotlin 2.x, which only comes with Spring Boot 4. Stay on 21 for now
-      // (jOOQ needs 21, Kotlin 1.9.x supports 21 but not 25).
-      matchDepNames: ["java-jdk"],
-      allowedVersions: "<25",
-    },
-    {
-      // springmockk 5 is compiled against Kotlin 2.x; blocked until Spring Boot 4 raises Kotlin.
-      matchPackageNames: ["com.ninja-squad:springmockk"],
-      allowedVersions: "<5",
+      // jOOQ 3.20+ Open Source editions require PostgreSQL 17/18; stay on 3.19 until the database is upgraded.
+      matchPackageNames: ["org.jooq:**"],
+      allowedVersions: "<3.20",
     },
     {
       // give each major update its own PR instead of the big "all dependencies" bundle.
diff --git a/.github/workflows/codeql.yml b/.github/workflows/codeql.yml
index 674a25d..d4f629c 100644
--- a/.github/workflows/codeql.yml
+++ b/.github/workflows/codeql.yml
@@ -22,4 +22,4 @@ jobs:
     with:
       languages: '["actions", "java-kotlin"]'
       java_build_command: "cp profiles/dev/config.properties profiles/dev/config.runner.properties && mvn clean install -DskipTests"
-      java_version: "17"
+      java_version: "25"
diff --git a/.github/workflows/run-kotlin-tests.yml b/.github/workflows/run-kotlin-tests.yml
index b4e7bc9..d24b9b9 100644
--- a/.github/workflows/run-kotlin-tests.yml
+++ b/.github/workflows/run-kotlin-tests.yml
@@ -24,10 +24,10 @@ jobs:
       - name: Start dependencies (blocking until up)
         run: ./development.sh start:deps
 
-      - name: Set up JDK 17
+      - name: Set up JDK 25
         uses: actions/setup-java@v6
         with:
-          java-version: "17"
+          java-version: "25"
           java-package: jdk
           architecture: x64
           distribution: temurin
diff --git a/Dockerfile b/Dockerfile
index 369a2fa..4c6dcda 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM maven:3-eclipse-temurin-17 AS builder
+FROM maven:3-eclipse-temurin-25 AS builder
 
 # set up workdir
 WORKDIR /build
diff --git a/pom.xml b/pom.xml
index 3f58023..01e2ae5 100644
--- a/pom.xml
+++ b/pom.xml
@@ -6,7 +6,7 @@
     <parent>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-starter-parent</artifactId>
-        <version>3.5.16</version>
+        <version>4.1.1</version>
         <relativePath/>
     </parent>
 
@@ -19,7 +19,7 @@
 
     <properties>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-        <java.version>17</java.version>
+        <java.version>25</java.version>
 
         <kotlin.compiler.incremental>true</kotlin.compiler.incremental>
         <kotlin.compiler.jvmTarget>${java.version}</kotlin.compiler.jvmTarget>
@@ -36,10 +36,12 @@
         <ktlint-plugin.version>3.7.1</ktlint-plugin.version>
 
         <!-- Library versions -->
+        <!-- jOOQ 3.20+ Open Source editions require PostgreSQL 17/18; pin to 3.19 for PostgreSQL 15 support. -->
+        <jooq.version>3.19.39</jooq.version>
         <kotlin-logging-jvm.version>8.0.4</kotlin-logging-jvm.version>
         <quicktheories.version>0.26</quicktheories.version>
         <mockk.version>1.14.11</mockk.version>
-        <springmockk.version>4.0.2</springmockk.version>
+        <springmockk.version>5.0.1</springmockk.version>
 
         <!-- Other properties -->
         <start.class>fi.hsl.jore4.timetables.TimetablesApiApplicationKt</start.class>
@@ -285,6 +287,8 @@
                     <args>
                         <!-- Enable strict mode for JSR-305 annotations. -->
                         <arg>-Xjsr305=strict</arg>
+                        <!-- Retain constructor parameter names so jOOQ maps records to POJOs by name. -->
+                        <arg>-java-parameters</arg>
                     </args>
                 </configuration>
                 <executions>
@@ -501,7 +505,7 @@
         </dependency>
         <dependency>
             <groupId>org.springframework.boot</groupId>
-            <artifactId>spring-boot-starter-web</artifactId>
+            <artifactId>spring-boot-starter-webmvc</artifactId>
         </dependency>
         <dependency>
             <groupId>org.springframework.boot</groupId>
@@ -544,20 +548,14 @@
         </dependency>
 
         <dependency>
-            <groupId>com.fasterxml.jackson.module</groupId>
+            <groupId>tools.jackson.module</groupId>
             <artifactId>jackson-module-kotlin</artifactId>
             <!-- version inherited from the Spring Boot parent POM -->
         </dependency>
 
-        <dependency>
-            <groupId>com.fasterxml.jackson.datatype</groupId>
-            <artifactId>jackson-datatype-jsr310</artifactId>
-            <!-- version inherited from the Spring Boot parent POM -->
-        </dependency>
-
         <dependency>
             <groupId>org.springframework.boot</groupId>
-            <artifactId>spring-boot-starter-test</artifactId>
+            <artifactId>spring-boot-starter-webmvc-test</artifactId>
             <scope>test</scope>
         </dependency>
 
diff --git a/src/main/kotlin/fi/hsl/jore4/timetables/TimetablesApiApplication.kt b/src/main/kotlin/fi/hsl/jore4/timetables/TimetablesApiApplication.kt
index 78fe2b1..acc9afa 100644
--- a/src/main/kotlin/fi/hsl/jore4/timetables/TimetablesApiApplication.kt
+++ b/src/main/kotlin/fi/hsl/jore4/timetables/TimetablesApiApplication.kt
@@ -1,10 +1,6 @@
 package fi.hsl.jore4.timetables
 
 import com.fasterxml.jackson.annotation.JsonInclude
-import com.fasterxml.jackson.databind.ObjectMapper
-import com.fasterxml.jackson.datatype.jsr310.JavaTimeModule
-import com.fasterxml.jackson.module.kotlin.KotlinFeature
-import com.fasterxml.jackson.module.kotlin.KotlinModule
 import fi.hsl.jore4.timetables.config.DatabaseProperties
 import fi.hsl.jore4.timetables.config.JOOQProperties
 import org.springframework.boot.autoconfigure.SpringBootApplication
@@ -12,6 +8,9 @@ import org.springframework.boot.context.properties.EnableConfigurationProperties
 import org.springframework.boot.runApplication
 import org.springframework.context.annotation.Bean
 import org.springframework.context.annotation.Primary
+import tools.jackson.databind.json.JsonMapper
+import tools.jackson.module.kotlin.KotlinFeature
+import tools.jackson.module.kotlin.KotlinModule
 
 fun main(args: Array<String>) {
     runApplication<TimetablesApiApplication>(*args)
@@ -25,11 +24,11 @@ fun main(args: Array<String>) {
 class TimetablesApiApplication {
     @Bean
     @Primary
-    fun objectMapper(): ObjectMapper =
-        ObjectMapper()
-            .setSerializationInclusion(JsonInclude.Include.NON_NULL)
-            .registerModule(JavaTimeModule())
-            .registerModule(
+    fun jsonMapper(): JsonMapper =
+        JsonMapper
+            .builder()
+            .changeDefaultPropertyInclusion { it.withValueInclusion(JsonInclude.Include.NON_NULL) }
+            .addModule(
                 KotlinModule
                     .Builder()
                     .withReflectionCacheSize(512)
@@ -39,5 +38,5 @@ class TimetablesApiApplication {
                     .configure(KotlinFeature.SingletonSupport, false)
                     .configure(KotlinFeature.StrictNullChecks, true)
                     .build()
-            )
+            ).build()
 }
diff --git a/src/main/kotlin/fi/hsl/jore4/timetables/repository/VehicleScheduleFrameRepository.kt b/src/main/kotlin/fi/hsl/jore4/timetables/repository/VehicleScheduleFrameRepository.kt
index 7f0d341..19dd113 100644
--- a/src/main/kotlin/fi/hsl/jore4/timetables/repository/VehicleScheduleFrameRepository.kt
+++ b/src/main/kotlin/fi/hsl/jore4/timetables/repository/VehicleScheduleFrameRepository.kt
@@ -78,7 +78,7 @@ class VehicleScheduleFrameRepository(
                 .and(replacedFrame.VALIDITY_START.lessThan(stagingFrame.VALIDITY_START))
 
         return dsl
-            .select()
+            .select(*VEHICLE_SCHEDULE_FRAME.fields())
             // Returns a row for each day type id.
             // We are not interested in those here, just the replaced frame ids.
             .distinctOn(replacedVehicleScheduleFrameIdField)
@@ -142,7 +142,7 @@ class VehicleScheduleFrameRepository(
                 .and(targetFrame.PRIORITY.eq(targetPriority.value))
 
         return dsl
-            .select()
+            .select(*VEHICLE_SCHEDULE_FRAME.fields())
             // Returns a row for each day type id.
             // We are not interested in those here, just the overlapping frame ids.
             .distinctOn(targetVehicleScheduleFrameIdField)
diff --git a/src/test/kotlin/fi/hsl/jore4/timetables/TimetablesDataset.kt b/src/test/kotlin/fi/hsl/jore4/timetables/TimetablesDataset.kt
index fae97f4..2bbf795 100644
--- a/src/test/kotlin/fi/hsl/jore4/timetables/TimetablesDataset.kt
+++ b/src/test/kotlin/fi/hsl/jore4/timetables/TimetablesDataset.kt
@@ -1,8 +1,8 @@
 package fi.hsl.jore4.timetables
 
-import com.fasterxml.jackson.core.type.TypeReference
-import com.fasterxml.jackson.databind.ObjectMapper
 import io.github.oshai.kotlinlogging.KotlinLogging
+import tools.jackson.core.type.TypeReference
+import tools.jackson.databind.json.JsonMapper
 
 private val LOGGER = KotlinLogging.logger {}
 
@@ -10,7 +10,7 @@ class TimetablesDataset : MutableMap<String, Any?> by mutableMapOf() {
     fun toJSONString(): String = OBJECT_MAPPER.writeValueAsString(this)
 
     companion object {
-        private val OBJECT_MAPPER = ObjectMapper()
+        private val OBJECT_MAPPER = JsonMapper()
 
         fun createFromResource(resourcePath: String): TimetablesDataset {
             val jsonStream = this::class.java.classLoader.getResourceAsStream(resourcePath)
diff --git a/src/test/kotlin/fi/hsl/jore4/timetables/api/TimetablesCombineApiTest.kt b/src/test/kotlin/fi/hsl/jore4/timetables/api/TimetablesCombineApiTest.kt
index cee7b8a..7a8095e 100644
--- a/src/test/kotlin/fi/hsl/jore4/timetables/api/TimetablesCombineApiTest.kt
+++ b/src/test/kotlin/fi/hsl/jore4/timetables/api/TimetablesCombineApiTest.kt
@@ -1,6 +1,5 @@
 package fi.hsl.jore4.timetables.api
 
-import com.fasterxml.jackson.databind.ObjectMapper
 import com.ninjasquad.springmockk.MockkBean
 import fi.hsl.jore4.timetables.enumerated.TimetablesPriority
 import fi.hsl.jore4.timetables.service.CombineTimetablesService
@@ -14,8 +13,8 @@ import io.mockk.verify
 import org.junit.jupiter.api.Test
 import org.junit.jupiter.api.extension.ExtendWith
 import org.springframework.beans.factory.annotation.Autowired
-import org.springframework.boot.test.autoconfigure.web.servlet.AutoConfigureMockMvc
 import org.springframework.boot.test.context.SpringBootTest
+import org.springframework.boot.webmvc.test.autoconfigure.AutoConfigureMockMvc
 import org.springframework.http.MediaType
 import org.springframework.test.context.ActiveProfiles
 import org.springframework.test.web.servlet.MockMvc
@@ -24,6 +23,7 @@ import org.springframework.test.web.servlet.request.MockMvcRequestBuilders
 import org.springframework.test.web.servlet.result.MockMvcResultMatchers.content
 import org.springframework.test.web.servlet.result.MockMvcResultMatchers.status
 import org.springframework.transaction.TransactionSystemException
+import tools.jackson.databind.json.JsonMapper
 import java.util.UUID
 
 @ExtendWith(MockKExtension::class)
@@ -325,6 +325,6 @@ class TimetablesCombineApiTest(
     }
 
     companion object {
-        private val MAPPER = ObjectMapper()
+        private val MAPPER = JsonMapper()
     }
 }
diff --git a/src/test/kotlin/fi/hsl/jore4/timetables/api/TimetablesReplaceApiTest.kt b/src/test/kotlin/fi/hsl/jore4/timetables/api/TimetablesReplaceApiTest.kt
index ef8c3af..1aa6adf 100644
--- a/src/test/kotlin/fi/hsl/jore4/timetables/api/TimetablesReplaceApiTest.kt
+++ b/src/test/kotlin/fi/hsl/jore4/timetables/api/TimetablesReplaceApiTest.kt
@@ -1,6 +1,5 @@
 package fi.hsl.jore4.timetables.api
 
-import com.fasterxml.jackson.databind.ObjectMapper
 import com.ninjasquad.springmockk.MockkBean
 import fi.hsl.jore4.timetables.enumerated.TimetablesPriority
 import fi.hsl.jore4.timetables.service.InvalidTargetPriorityException
@@ -13,8 +12,8 @@ import io.mockk.verify
 import org.junit.jupiter.api.Test
 import org.junit.jupiter.api.extension.ExtendWith
 import org.springframework.beans.factory.annotation.Autowired
-import org.springframework.boot.test.autoconfigure.web.servlet.AutoConfigureMockMvc
 import org.springframework.boot.test.context.SpringBootTest
+import org.springframework.boot.webmvc.test.autoconfigure.AutoConfigureMockMvc
 import org.springframework.http.MediaType
 import org.springframework.test.context.ActiveProfiles
 import org.springframework.test.web.servlet.MockMvc
@@ -23,6 +22,7 @@ import org.springframework.test.web.servlet.request.MockMvcRequestBuilders
 import org.springframework.test.web.servlet.result.MockMvcResultMatchers.content
 import org.springframework.test.web.servlet.result.MockMvcResultMatchers.status
 import org.springframework.transaction.TransactionSystemException
+import tools.jackson.databind.json.JsonMapper
 import java.util.UUID
 
 private val LOGGER = KotlinLogging.logger {}
@@ -270,6 +270,6 @@ class TimetablesReplaceApiTest(
     }
 
     companion object {
-        private val OBJECT_MAPPER = ObjectMapper()
+        private val OBJECT_MAPPER = JsonMapper()
     }
 }
diff --git a/src/test/kotlin/fi/hsl/jore4/timetables/api/TimetablesToCombineApiTest.kt b/src/test/kotlin/fi/hsl/jore4/timetables/api/TimetablesToCombineApiTest.kt
index 32d0a5b..5408d15 100644
--- a/src/test/kotlin/fi/hsl/jore4/timetables/api/TimetablesToCombineApiTest.kt
+++ b/src/test/kotlin/fi/hsl/jore4/timetables/api/TimetablesToCombineApiTest.kt
@@ -10,8 +10,8 @@ import io.mockk.verify
 import org.junit.jupiter.api.Test
 import org.junit.jupiter.api.extension.ExtendWith
 import org.springframework.beans.factory.annotation.Autowired
-import org.springframework.boot.test.autoconfigure.web.servlet.AutoConfigureMockMvc
 import org.springframework.boot.test.context.SpringBootTest
+import org.springframework.boot.webmvc.test.autoconfigure.AutoConfigureMockMvc
 import org.springframework.http.MediaType
 import org.springframework.test.context.ActiveProfiles
 import org.springframework.test.web.servlet.MockMvc
diff --git a/src/test/kotlin/fi/hsl/jore4/timetables/api/TimetablesToReplaceApiTest.kt b/src/test/kotlin/fi/hsl/jore4/timetables/api/TimetablesToReplaceApiTest.kt
index 3923d45..09dd318 100644
--- a/src/test/kotlin/fi/hsl/jore4/timetables/api/TimetablesToReplaceApiTest.kt
+++ b/src/test/kotlin/fi/hsl/jore4/timetables/api/TimetablesToReplaceApiTest.kt
@@ -10,8 +10,8 @@ import io.mockk.verify
 import org.junit.jupiter.api.Test
 import org.junit.jupiter.api.extension.ExtendWith
 import org.springframework.beans.factory.annotation.Autowired
-import org.springframework.boot.test.autoconfigure.web.servlet.AutoConfigureMockMvc
 import org.springframework.boot.test.context.SpringBootTest
+import org.springframework.boot.webmvc.test.autoconfigure.AutoConfigureMockMvc
 import org.springframework.http.MediaType
 import org.springframework.test.context.ActiveProfiles
 import org.springframework.test.web.servlet.MockMvc
diff --git a/src/test/kotlin/fi/hsl/jore4/timetables/extensions/TimetablesDatasetExtensions.kt b/src/test/kotlin/fi/hsl/jore4/timetables/extensions/TimetablesDatasetExtensions.kt
index d755d0a..6075045 100644
--- a/src/test/kotlin/fi/hsl/jore4/timetables/extensions/TimetablesDatasetExtensions.kt
+++ b/src/test/kotlin/fi/hsl/jore4/timetables/extensions/TimetablesDatasetExtensions.kt
@@ -1,8 +1,8 @@
 package fi.hsl.jore4.timetables.extensions
 
-import com.fasterxml.jackson.core.type.TypeReference
-import com.fasterxml.jackson.databind.ObjectMapper
 import io.github.oshai.kotlinlogging.KotlinLogging
+import tools.jackson.core.type.TypeReference
+import tools.jackson.databind.json.JsonMapper
 
 private val LOGGER = KotlinLogging.logger {}
 
@@ -23,7 +23,7 @@ fun MutableMap<String, Any?>.getNested(propertyPath: String): MutableMap<String,
     return child
 }
 
-private val OBJECT_MAPPER = ObjectMapper()
+private val OBJECT_MAPPER = JsonMapper()
 
 fun MutableMap<String, Any?>.deepClone(): MutableMap<String, Any?> {
     val asString = OBJECT_MAPPER.writeValueAsString(this)