diff --git a/.tool-versions b/.tool-versions
index 22a53e8..62f3d2f 100644
--- a/.tool-versions
+++ b/.tool-versions
@@ -1,4 +1,4 @@
-terraform 1.8.5
+terraform 1.9.1
 terraform-docs 0.18.0
 tflint 0.51.1
 pre-commit 3.7.1