diff --git a/pyproject.toml b/pyproject.toml
index 8323381f7..37b5f5bc5 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -37,7 +37,7 @@ dependencies = { file = "requirements.txt" }
 
 [project.optional-dependencies]
 voice = [
-    "PyNaCl>=1.5.0,<1.6",
+    "PyNaCl>=1.6.0,<1.7",
     "davey>=0.1.0"
 ]
 docs = [