diff --git a/go.mod b/go.mod
index 273c28e..220a952 100644
--- a/go.mod
+++ b/go.mod
@@ -9,5 +9,5 @@ require pgregory.net/rapid v1.3.0
 require (
 	github.com/cplieger/atomicfile v1.0.3
 	github.com/cplieger/health v1.0.2
-	golang.org/x/sync v0.20.0
+	golang.org/x/sync v0.21.0
 )
diff --git a/go.sum b/go.sum
index 07df0e4..1c13a49 100644
--- a/go.sum
+++ b/go.sum
@@ -14,5 +14,7 @@ github.com/cplieger/health v1.0.2 h1:tS2XtQVQL4TXEAr8u0xCtjOqJFrOtRzD8pzm/l2DbSU
 github.com/cplieger/health v1.0.2/go.mod h1:INjkN9qJnR14X5AFqX6ymFaHvx51djYgk2oQb/gJ9u8=
 golang.org/x/sync v0.20.0 h1:e0PTpb7pjO8GAtTs2dQ6jYa5BWYlMuX047Dco/pItO4=
 golang.org/x/sync v0.20.0/go.mod h1:9xrNwdLfx4jkKbNva9FpL6vEN7evnE43NNNJQ2LF3+0=
+golang.org/x/sync v0.21.0 h1:HLII4xRRTtCRkxYp4HNFF0Js/Og6q2i++KXbg0gHCwM=
+golang.org/x/sync v0.21.0/go.mod h1:9xrNwdLfx4jkKbNva9FpL6vEN7evnE43NNNJQ2LF3+0=
 pgregory.net/rapid v1.3.0 h1:vBvO0VSqti75J1jjYqpgPNBLKMd1+gxa9fYo7vk/Exc=
 pgregory.net/rapid v1.3.0/go.mod h1:dPlE4OBBxgXPqkP79flB6sJL1dx5azpI7HQ9MY9Z7uk=