diff --git a/pom.xml b/pom.xml
index 9301502..12d02a5 100644
--- a/pom.xml
+++ b/pom.xml
@@ -16,7 +16,6 @@
     <maven.compiler.target>1.8</maven.compiler.target>
     <maven.compiler.source>1.8</maven.compiler.source>
     <commons-lang3.version>3.12.0</commons-lang3.version>
-    <commons-collections4.version>4.4</commons-collections4.version>
   </properties>
 
   <dependencies>
@@ -30,11 +29,6 @@
       <artifactId>commons-lang3</artifactId>
       <version>${commons-lang3.version}</version>
     </dependency>
-    <dependency>
-        <groupId>org.apache.commons</groupId>
-        <artifactId>commons-collections4</artifactId>
-        <version>${commons-collections4.version}</version>
-    </dependency>
     <dependency>
       <groupId>org.junit.jupiter</groupId>
       <artifactId>junit-jupiter-api</artifactId>
diff --git a/src/main/java/xyz/zhouxy/plusone/validator/CollectionValidator.java b/src/main/java/xyz/zhouxy/plusone/validator/CollectionValidator.java
index 4526988..cb434a1 100644
--- a/src/main/java/xyz/zhouxy/plusone/validator/CollectionValidator.java
+++ b/src/main/java/xyz/zhouxy/plusone/validator/CollectionValidator.java
@@ -4,8 +4,6 @@ import java.util.Collection;
 import java.util.function.Function;
 import java.util.function.Supplier;
 
-import org.apache.commons.collections4.CollectionUtils;
-
 public class CollectionValidator<DTO, T> extends PropertyValidator<DTO, Collection<T>, CollectionValidator<DTO, T>> {
 
     CollectionValidator(Function<DTO, Collection<T>> getter) {
@@ -24,7 +22,7 @@ public class CollectionValidator<DTO, T> extends PropertyValidator<DTO, Collecti
 
     public <E extends RuntimeException> CollectionValidator<DTO, T> notEmpty(
             Function<Collection<T>, E> exceptionCreator) {
-        withRule(CollectionUtils::isNotEmpty, exceptionCreator);
+        withRule(value -> value != null && !value.isEmpty(), exceptionCreator);
         return this;
     }
 
@@ -40,7 +38,7 @@ public class CollectionValidator<DTO, T> extends PropertyValidator<DTO, Collecti
 
     public <E extends RuntimeException> CollectionValidator<DTO, T> isEmpty(
             Function<Collection<T>, E> exceptionCreator) {
-        withRule(CollectionUtils::isEmpty, exceptionCreator);
+        withRule(value -> value == null || value.isEmpty(), exceptionCreator);
         return this;
     }