diff --git a/pyproject.toml b/pyproject.toml
index 4ceee7b..78f8276 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ version = "2.1.1"
 description = "Implementation of the Shapeshifter (UFTP) protocol"
 dependencies = [
     "xsdata[lxml]>=25.0,<26.0",
-    "pynacl==1.5.0",
+    "pynacl==1.6.2",
     "dnspython==2.7.0",
     "fastapi>=0.110,<0.117",
     "fastapi-xml>=1.1.1,<2.0.0",