diff --git a/iasl/.md5sum b/iasl/.md5sum
index 8d5ee2caf..9aa0212da 100644
--- a/iasl/.md5sum
+++ b/iasl/.md5sum
@@ -1 +1 @@
-31691e2eb82b2064f78536a3423c18d6  acpica-unix2-20180508.tar.gz
+145d09fc05fe05812506749d914efe43  acpica-unix2-20180531.tar.gz
diff --git a/iasl/.signature b/iasl/.signature
index c732d1b90..213e0875f 100644
--- a/iasl/.signature
+++ b/iasl/.signature
@@ -1,5 +1,5 @@
 untrusted comment: verify with /etc/ports/contrib.pub
-RWSagIOpLGJF3876wwVSHFWvE2rW2dEnV44P8KMSKLjpVMB2Ff+QGKmJPP6IeHzjBz5tHm1PQfpEO+jbdKIaBh/hsDlND5BO1QU=
-SHA256 (Pkgfile) = 38ca8cc0a2f63e82aa62cb4715b23da2a2bb256ef1ccefcc226031d8d0f8d70c
+RWSagIOpLGJF3wE+f7ePvaWLspmyityXM4dLFevvEchU/e5zLZFjDijnel8UnJH6eKBsZkWYdRDQLmxeGYi353E8enQVcEFhsgI=
+SHA256 (Pkgfile) = 85d9e0360c7dc3c89067d3622bb28feb82a855fc004c39b4cc24301a3580afa7
 SHA256 (.footprint) = 8d2c017d70670b63ceb84acc621f4f45389d584dcffefaf4ec15ebe0b1a993c6
-SHA256 (acpica-unix2-20180508.tar.gz) = 5d8fc9d9db9e04830d40bec9add04b21c05d466e0187d354815006fdd823cf15
+SHA256 (acpica-unix2-20180531.tar.gz) = e50df20e76c44941277686d4fb4c264605333e7d04ca6dc2cbc385926d78fb60
diff --git a/iasl/Pkgfile b/iasl/Pkgfile
index 3d6ba4ba5..cbac73d65 100644
--- a/iasl/Pkgfile
+++ b/iasl/Pkgfile
@@ -3,7 +3,7 @@
 # Maintainer:  John Vogel, jvogel4 at stny dot rr dot com
 
 name=iasl
-version=20180508
+version=20180531
 release=1
 source=(https://acpica.org/sites/acpica/files/acpica-unix2-$version.tar.gz)