diff --git a/buildSrc/src/main/java/ReleaseConfigPlugin.kt b/buildSrc/src/main/java/ReleaseConfigPlugin.kt
index 04b7cd6..f4ff1f0 100644
--- a/buildSrc/src/main/java/ReleaseConfigPlugin.kt
+++ b/buildSrc/src/main/java/ReleaseConfigPlugin.kt
@@ -89,6 +89,7 @@ class ReleaseConfigPlugin : Plugin<Project> {
         }
 
         target.configure<SigningExtension> {
+          isRequired = isRelease
           sign(publications["release"])
         }
       }
diff --git a/jitpack.yml b/jitpack.yml
new file mode 100644
index 0000000..9a10e5d
--- /dev/null
+++ b/jitpack.yml
@@ -0,0 +1,3 @@
+# https://github.com/jitpack/jitpack.io/issues/4474
+jdk:
+  - openjdk11