diff --git a/Compiler/boost/1/variants b/Compiler/boost/1/variants
index baa9993..5aeaa58 100644
--- a/Compiler/boost/1/variants
+++ b/Compiler/boost/1/variants
@@ -22,3 +22,5 @@ boost/1.62.0         unstable	gcc/6.3.0 Python/2.7.12
 boost/1.62.0         unstable	gcc/7.1.0 Python/2.7.12 
 boost/1.63.0         stable     gcc/6.3.0 Python/2.7.12
 boost/1.64.0         unstable   gcc/5.4.0 Python/2.7.12
+
+boost/1.66.0         unstable   gcc/7.3.0 b:Python/2.7.12