diff --git a/build.gradle b/build.gradle
index 7a76109..2281713 100644
--- a/build.gradle
+++ b/build.gradle
@@ -48,7 +48,7 @@ dependencies {
 	testImplementation gradleTestKit()
 	testImplementation 'commons-io:commons-io:2.6'
 	testImplementation 'com.google.jimfs:jimfs:1.1'      // In-Memory Filesystem
-	testImplementation 'org.spockframework:spock-core:1.0-groovy-2.4', {
+	testImplementation 'org.spockframework:spock-core:1.3-groovy-2.5', {
 		exclude group: 'org.codehaus.groovy'
 	}
 	testImplementation 'org.hamcrest:hamcrest-all:1.3'