diff --git a/pom.xml b/pom.xml
index 302164d3..3fe6cbfc 100644
--- a/pom.xml
+++ b/pom.xml
@@ -21,8 +21,8 @@
     <dependencies>
         <dependency>
             <groupId>org.apache.logging.log4j</groupId>
-            <artifactId>log4j-core</artifactId>
-            <version>2.14.1</version>
+            <artifactId>log4j-api</artifactId>
+            <version>2.20.0</version>
         </dependency>
     </dependencies>
     <build>
diff --git a/src/main/java/core/basesyntax/Counter.java b/src/main/java/core/basesyntax/Counter.java
index 4af46bd4..feb1ad7d 100644
--- a/src/main/java/core/basesyntax/Counter.java
+++ b/src/main/java/core/basesyntax/Counter.java
@@ -12,7 +12,7 @@ public Counter(int value) {
         this.value = value;
     }
 
-    public void decreaseValue() {
+    public synchronized void decreaseValue() {
         logger.info(String.format(MESSAGE,
                 "Before decrementing", Thread.currentThread().getName(), value));
         value--;