diff --git a/samples/android/gradle.properties b/samples/android/gradle.properties
index ff0facea5..12ff75bc1 100644
--- a/samples/android/gradle.properties
+++ b/samples/android/gradle.properties
@@ -16,7 +16,7 @@ org.gradle.jvmargs=-Xmx1536m
 # http://www.gradle.org/docs/current/userguide/multi_project_builds.html#sec:decoupled_projects
 # org.gradle.parallel=true
 
-spek_version=2.1.0-alpha.0.18+85a26f6
+spek_version=2.1.0-alpha.0.13+397dc38
 android_junit5_version=1.4.2.0
 junit5_runner=0.2.2
 jacoco_version=0.8.1
diff --git a/samples/jvm/build.gradle b/samples/jvm/build.gradle
index 0c6622e90..bb50f351e 100644
--- a/samples/jvm/build.gradle
+++ b/samples/jvm/build.gradle
@@ -1,6 +1,6 @@
 buildscript {
     ext.kotlin_version = '1.3.31'
-    ext.spek_version = '2.1.0-alpha.0.18+85a26f6'
+    ext.spek_version = '2.1.0-alpha.0.13+397dc38'
 
     repositories {
         jcenter()
diff --git a/samples/maven/pom.xml b/samples/maven/pom.xml
index d6390ea1b..dc6906b70 100644
--- a/samples/maven/pom.xml
+++ b/samples/maven/pom.xml
@@ -12,7 +12,7 @@
     <properties>
         <jdk.version>1.8</jdk.version>
         <kotlin.version>1.3.31</kotlin.version>
-        <spek.version>2.1.0-alpha.0.18+85a26f6</spek.version>
+        <spek.version>2.1.0-alpha.0.13+397dc38</spek.version>
     </properties>
 
     <dependencies>
diff --git a/samples/multiplatform/build.gradle b/samples/multiplatform/build.gradle
index 15e63bb25..de27a188e 100644
--- a/samples/multiplatform/build.gradle
+++ b/samples/multiplatform/build.gradle
@@ -1,6 +1,6 @@
 buildscript {
     ext.kotlin_version = '1.3.31'
-    ext.spek_version = '2.1.0-alpha.0.18+85a26f6'
+    ext.spek_version = '2.1.0-alpha.0.13+397dc38'
 
     repositories {
         jcenter()