diff --git a/biology/iqtree/Makefile b/biology/iqtree/Makefile
index 13957adac6a6..c8693b1a975a 100644
--- a/biology/iqtree/Makefile
+++ b/biology/iqtree/Makefile
@@ -2,7 +2,7 @@
 
 PORTNAME=	iqtree
 DISTVERSIONPREFIX=	v
-DISTVERSION=	1.6.3
+DISTVERSION=	1.6.4
 CATEGORIES=	biology
 
 MAINTAINER=	jrm@FreeBSD.org
diff --git a/biology/iqtree/distinfo b/biology/iqtree/distinfo
index a5ce5f35a8da..e9342ed6967f 100644
--- a/biology/iqtree/distinfo
+++ b/biology/iqtree/distinfo
@@ -1,3 +1,3 @@
-TIMESTAMP = 1521767631
-SHA256 (Cibiv-IQ-TREE-v1.6.3_GH0.tar.gz) = a2a2752925220c8fc024e0d2379ab5d53f703e597341c8b46030fcb12aa5e0c0
-SIZE (Cibiv-IQ-TREE-v1.6.3_GH0.tar.gz) = 4458736
+TIMESTAMP = 1525105655
+SHA256 (Cibiv-IQ-TREE-v1.6.4_GH0.tar.gz) = e5fa204ab6e254137b1bff4b4b1f934fb6d9cfbb579662c8ab09666232e7965c
+SIZE (Cibiv-IQ-TREE-v1.6.4_GH0.tar.gz) = 4467168