diff --git a/build.gradle.kts b/build.gradle.kts
index 19ea8a8..7f3a779 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -33,6 +33,9 @@ dependencies {
     // Integration test dependencies
     testImplementation("org.bouncycastle:bcprov-jdk18on:1.84")
     testImplementation("org.springframework.security:spring-security-crypto:7.1.0")
+    // Provides org.springframework.util.StringUtils (optional dep of spring-security-crypto 7.x);
+    // Spring Framework 7.0.x is the line Spring Security 7.1.0 targets.
+    testImplementation("org.springframework:spring-core:7.0.8")
     testImplementation("commons-logging:commons-logging:1.4.0")
 }