diff --git a/core/src/main/java/com/google/cloud/sql/core/CloudSqlInstance.java b/core/src/main/java/com/google/cloud/sql/core/CloudSqlInstance.java
index 7a2b35cf1..d5044a988 100644
--- a/core/src/main/java/com/google/cloud/sql/core/CloudSqlInstance.java
+++ b/core/src/main/java/com/google/cloud/sql/core/CloudSqlInstance.java
@@ -28,7 +28,6 @@
 import com.google.errorprone.annotations.concurrent.GuardedBy;
 import java.io.IOException;
 import java.security.KeyPair;
-import java.time.Duration;
 import java.time.Instant;
 import java.time.temporal.ChronoUnit;
 import java.util.List;
diff --git a/core/src/test/java/com/google/cloud/sql/core/CloudSqlInstanceConcurrencyTest.java b/core/src/test/java/com/google/cloud/sql/core/CloudSqlInstanceConcurrencyTest.java
index ff4fbcc78..c00b3b849 100644
--- a/core/src/test/java/com/google/cloud/sql/core/CloudSqlInstanceConcurrencyTest.java
+++ b/core/src/test/java/com/google/cloud/sql/core/CloudSqlInstanceConcurrencyTest.java
@@ -14,7 +14,6 @@
 import java.io.IOException;
 import java.security.KeyPair;
 import java.sql.Date;
-import java.time.Duration;
 import java.time.Instant;
 import java.time.temporal.ChronoUnit;
 import java.util.ArrayList;