diff --git a/synapse-aws-auth/build.gradle b/synapse-aws-auth/build.gradle
index fb2be8ea..609d23d1 100644
--- a/synapse-aws-auth/build.gradle
+++ b/synapse-aws-auth/build.gradle
@@ -124,6 +124,7 @@ publishing {
 
 
 signing {
+    useGpgCmd()
     sign publishing.publications.mavenJava
 }
 
diff --git a/synapse-aws-kinesis/build.gradle b/synapse-aws-kinesis/build.gradle
index eb92fd48..986625cd 100644
--- a/synapse-aws-kinesis/build.gradle
+++ b/synapse-aws-kinesis/build.gradle
@@ -124,6 +124,7 @@ publishing {
 
 
 signing {
+    useGpgCmd()
     sign publishing.publications.mavenJava
 }
 
diff --git a/synapse-aws-sqs/build.gradle b/synapse-aws-sqs/build.gradle
index 4b4f080e..b26fe49f 100644
--- a/synapse-aws-sqs/build.gradle
+++ b/synapse-aws-sqs/build.gradle
@@ -123,6 +123,7 @@ publishing {
 
 
 signing {
+    useGpgCmd()
     sign publishing.publications.mavenJava
 }
 
diff --git a/synapse-compaction-aws-s3/build.gradle b/synapse-compaction-aws-s3/build.gradle
index c193b44f..9f17326d 100644
--- a/synapse-compaction-aws-s3/build.gradle
+++ b/synapse-compaction-aws-s3/build.gradle
@@ -127,6 +127,7 @@ publishing {
 
 
 signing {
+    useGpgCmd()
     sign publishing.publications.mavenJava
 }
 
diff --git a/synapse-core/build.gradle b/synapse-core/build.gradle
index b4b682c0..5635d879 100644
--- a/synapse-core/build.gradle
+++ b/synapse-core/build.gradle
@@ -155,6 +155,7 @@ publishing {
 }
 
 signing {
+    useGpgCmd()
     sign publishing.publications.mavenJava
 }
 
diff --git a/synapse-edison/build.gradle b/synapse-edison/build.gradle
index 1fd75b10..f2a24b89 100644
--- a/synapse-edison/build.gradle
+++ b/synapse-edison/build.gradle
@@ -119,6 +119,7 @@ publishing {
 }
 
 signing {
+    useGpgCmd()
     sign publishing.publications.mavenJava
 }
 
diff --git a/synapse-redis/build.gradle b/synapse-redis/build.gradle
index ff206306..269cd6c3 100644
--- a/synapse-redis/build.gradle
+++ b/synapse-redis/build.gradle
@@ -130,6 +130,7 @@ publishing {
 
 
 signing {
+    useGpgCmd()
     sign publishing.publications.mavenJava
 }
 
diff --git a/synapse-testsupport/build.gradle b/synapse-testsupport/build.gradle
index f9ed009e..f0842104 100644
--- a/synapse-testsupport/build.gradle
+++ b/synapse-testsupport/build.gradle
@@ -130,6 +130,7 @@ publishing {
 }
 
 signing {
+    useGpgCmd()
     sign publishing.publications.mavenJava
 }