diff --git a/math/lean/Makefile b/math/lean/Makefile
index 79d295c961b1..8aca9e7f2569 100644
--- a/math/lean/Makefile
+++ b/math/lean/Makefile
@@ -2,7 +2,7 @@
 
 PORTNAME=	lean
 DISTVERSIONPREFIX=	v
-DISTVERSION=	3.18.3
+DISTVERSION=	3.18.4
 CATEGORIES=	math
 PKGNAMEPREFIX=	${PYTHON_PKGNAMEPREFIX}
 
diff --git a/math/lean/distinfo b/math/lean/distinfo
index 3a32f0ac15f8..b5d230f2f0e9 100644
--- a/math/lean/distinfo
+++ b/math/lean/distinfo
@@ -1,3 +1,3 @@
-TIMESTAMP = 1596123882
-SHA256 (leanprover-community-lean-v3.18.3_GH0.tar.gz) = ec1980fea0612f621c03b1bba10eb3eac9eeba1765b7d24f87ced160dfa5768b
-SIZE (leanprover-community-lean-v3.18.3_GH0.tar.gz) = 1848372
+TIMESTAMP = 1596424399
+SHA256 (leanprover-community-lean-v3.18.4_GH0.tar.gz) = 9b7c88e5a6c56ccd9674de96a4806db40e67b96cc13b7382cce497b9b4a738e2
+SIZE (leanprover-community-lean-v3.18.4_GH0.tar.gz) = 1848583