diff --git a/sdks/java/extensions/sorter/build.gradle b/sdks/java/extensions/sorter/build.gradle
index f6f0dc6cd0b7..52b95c62d138 100644
--- a/sdks/java/extensions/sorter/build.gradle
+++ b/sdks/java/extensions/sorter/build.gradle
@@ -20,6 +20,7 @@ import java.util.stream.Collectors
 
 plugins { id 'org.apache.beam.module' }
 applyJavaNature(
+  enableStrictDependencies: true,
   automaticModuleName: 'org.apache.beam.sdk.extensions.sorter')
 
 description = "Apache Beam :: SDKs :: Java :: Extensions :: Sorter"
@@ -36,10 +37,9 @@ hadoopVersions.each {kv -> configurations.create("hadoopVersion$kv.key")}
 dependencies {
   compile project(path: ":sdks:java:core", configuration: "shadow")
   compile library.java.vendored_guava_26_0_jre
+  compile library.java.slf4j_api
   provided library.java.hadoop_mapreduce_client_core
   provided library.java.hadoop_common
-  testCompile library.java.hamcrest_core
-  testCompile library.java.hamcrest_library
   testCompile library.java.mockito_core
   testCompile library.java.junit
   testRuntimeOnly project(path: ":runners:direct-java", configuration: "shadow")