diff --git a/go.mod b/go.mod
index 6c3fafd..cd86b60 100644
--- a/go.mod
+++ b/go.mod
@@ -2,6 +2,8 @@ module github.com/freeformz/seq
 
 go 1.25
 
+toolchain go1.26.4
+
 retract v0.2.3
 
 retract v0.3.2 // tag was deleted and retagged as v0.4.0; module proxy caches are immutable