diff --git a/buildSrc/src/main/groovy/lnd-manageJ.java-conventions.gradle b/buildSrc/src/main/groovy/lnd-manageJ.java-conventions.gradle
index 620df74e..264d8487 100644
--- a/buildSrc/src/main/groovy/lnd-manageJ.java-conventions.gradle
+++ b/buildSrc/src/main/groovy/lnd-manageJ.java-conventions.gradle
@@ -9,7 +9,6 @@ plugins {
     id 'lnd-manageJ.pmd'
     id 'lnd-manageJ.jacoco'
     id 'org.springframework.boot'
-    id 'io.spring.dependency-management'
     id 'java-test-fixtures'
     id 'lnd-manageJ.spotbugs'
     id 'lnd-manageJ.versions'
@@ -33,6 +32,7 @@ tasks.withType(JavaCompile).configureEach {
 
 dependencies {
     implementation platform('de.cotto.lndmanagej:platform')
+    testFixturesImplementation platform('de.cotto.lndmanagej:platform')
     implementation 'org.springframework.boot:spring-boot-starter'
     implementation 'org.apache.commons:commons-lang3'
     implementation 'com.google.code.findbugs:jsr305'
diff --git a/caching/src/test/java/de/cotto/lndmanagej/caching/CacheBuilderTest.java b/caching/src/test/java/de/cotto/lndmanagej/caching/CacheBuilderTest.java
index e1538ce7..399272c3 100644
--- a/caching/src/test/java/de/cotto/lndmanagej/caching/CacheBuilderTest.java
+++ b/caching/src/test/java/de/cotto/lndmanagej/caching/CacheBuilderTest.java
@@ -2,8 +2,10 @@ package de.cotto.lndmanagej.caching;
 
 import com.github.benmanes.caffeine.cache.LoadingCache;
 import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.Timeout;
 
 import java.time.Duration;
+import java.util.concurrent.TimeUnit;
 
 import static org.assertj.core.api.Assertions.assertThat;
 
@@ -59,14 +61,23 @@ class CacheBuilderTest {
     }
 
     @Test
+    @Timeout(value = 900, unit = TimeUnit.MILLISECONDS)
     void withRefresh_returns_old_value() throws InterruptedException {
         LoadingCache<Object, Long> cache = new CacheBuilder()
                 .withRefresh(Duration.ofMillis(1))
-                .build(System::nanoTime);
+                .build(() -> {
+                    try {
+                        Thread.sleep(1_000);
+                    } catch (InterruptedException e) {
+                        // ignore
+                    }
+                    return System.nanoTime();
+                });
+        cache.put("", 0L);
         Long first = cache.get("");
         Thread.sleep(10);
         Long second = cache.get("");
-        assertThat(first).isEqualTo(second);
+        assertThat(first).isEqualTo(second).isEqualTo(0L);
     }
 
     @Test
@@ -117,4 +128,4 @@ class CacheBuilderTest {
         Long second = cache.get("");
         assertThat(first).isEqualTo(second);
     }
-}
\ No newline at end of file
+}
diff --git a/platform/build.gradle b/platform/build.gradle
index 036d2bd9..fc46d697 100644
--- a/platform/build.gradle
+++ b/platform/build.gradle
@@ -9,7 +9,10 @@ javaPlatform {
 }
 
 dependencies {
+    def springBootVersion = '2.7.5'
+    def grpcVersion = '1.45.1'
     api platform('org.springframework.cloud:spring-cloud-dependencies:2021.0.4')
+    api platform('org.springframework.boot:spring-boot-dependencies:' + springBootVersion)
 
     constraints {
         api 'com.adarshr:gradle-test-logger-plugin:3.2.0'
@@ -27,9 +30,9 @@ dependencies {
         api 'info.solidsoft.gradle.pitest:gradle-pitest-plugin:1.9.0'
         api 'io.dropwizard.metrics:metrics-core:4.2.10'
         api 'io.github.resilience4j:resilience4j-spring-boot2:1.7.1'
-        api 'io.grpc:grpc-netty:1.45.1'
-        api 'io.grpc:grpc-protobuf:1.45.1'
-        api 'io.grpc:grpc-stub:1.45.1'
+        api 'io.grpc:grpc-netty:' + grpcVersion
+        api 'io.grpc:grpc-protobuf:' + grpcVersion
+        api 'io.grpc:grpc-stub:' + grpcVersion
         api 'javax.annotation:javax.annotation-api:1.3.2'
         api 'net.ltgt.gradle:gradle-errorprone-plugin:3.0.1'
         api 'net.ltgt.gradle:gradle-nullaway-plugin:1.4.0'
@@ -38,7 +41,7 @@ dependencies {
         api 'org.awaitility:awaitility:4.2.0'
         api 'org.eclipse.collections:eclipse-collections:11.0.0'
         api 'org.ini4j:ini4j:0.5.4'
-        api 'org.springframework.boot:spring-boot-gradle-plugin:2.7.5'
+        api 'org.springframework.boot:spring-boot-gradle-plugin:' + springBootVersion
         api 'org.webjars:bootstrap:5.2.0'
         api 'org.webjars:webjars-locator:0.45'
         api 'uk.org.lidalia:slf4j-test:1.2.0'