diff --git a/src/main/java/com/configcat/ConfigCatClient.java b/src/main/java/com/configcat/ConfigCatClient.java
index 3c58aeb..d7b8610 100644
--- a/src/main/java/com/configcat/ConfigCatClient.java
+++ b/src/main/java/com/configcat/ConfigCatClient.java
@@ -8,7 +8,6 @@
 import java.util.concurrent.CompletableFuture;
 import java.util.concurrent.atomic.AtomicBoolean;
 import java.util.function.Consumer;
-import java.util.function.Function;
 
 /**
  * A client for handling configurations provided by ConfigCat.
diff --git a/src/main/java/com/configcat/ConfigCatLogger.java b/src/main/java/com/configcat/ConfigCatLogger.java
index 92fc4d0..597d155 100644
--- a/src/main/java/com/configcat/ConfigCatLogger.java
+++ b/src/main/java/com/configcat/ConfigCatLogger.java
@@ -2,8 +2,6 @@
 
 import org.slf4j.Logger;
 
-import java.util.function.Function;
-
 class ConfigCatLogger {
     private final Logger logger;
     private final LogLevel logLevel;
diff --git a/src/test/java/com/configcat/LoggerTests.java b/src/test/java/com/configcat/LoggerTests.java
index a206aed..68a6cef 100644
--- a/src/test/java/com/configcat/LoggerTests.java
+++ b/src/test/java/com/configcat/LoggerTests.java
@@ -3,8 +3,6 @@
 import org.junit.jupiter.api.Test;
 import org.slf4j.Logger;
 
-import java.util.function.Function;
-
 import static org.mockito.Mockito.*;
 
 public class LoggerTests {