diff --git a/requirements-pinned.txt b/requirements-pinned.txt
index f33e97e8..0b58c68a 100644
--- a/requirements-pinned.txt
+++ b/requirements-pinned.txt
@@ -4,7 +4,7 @@ cryptography==2.9.2
 enum34==1.1.6             ; python_version < "3" # via cryptography
 ipaddress==1.0.23         ; python_version < "3" # via cryptography
 pycparser==2.20           # via cffi
-pynacl==1.3.0
+pynacl==1.4.0
 python-dateutil==2.8.1
 six==1.15.0
 subprocess32==3.5.4       ; python_version < "3"