diff --git a/pdb-plotting/build.gradle b/pdb-plotting/build.gradle
index 3507ffe..fcb2d8d 100644
--- a/pdb-plotting/build.gradle
+++ b/pdb-plotting/build.gradle
@@ -5,6 +5,7 @@ dependencies {
   implementation project(':pdb-utils')
 	implementation lib_primitive_collections
 	implementation lib_jackson_databind
+	implementation lib_commons_lang3
 	
   implementation lib_log4j2_core
   implementation lib_log4j2_slf4j_impl