diff --git a/.go-version b/.go-version
index 20a1265cf3..ce2dd53570 100644
--- a/.go-version
+++ b/.go-version
@@ -1 +1 @@
-1.21.4
+1.21.5
diff --git a/api/go.mod b/api/go.mod
index 9519dfcee5..e2d8d5146b 100644
--- a/api/go.mod
+++ b/api/go.mod
@@ -2,7 +2,7 @@ module github.com/hashicorp/boundary/api
 
 go 1.21
 
-toolchain go1.21.4
+toolchain go1.21.5
 
 require (
 	github.com/hashicorp/boundary/sdk v0.0.40
diff --git a/sdk/go.mod b/sdk/go.mod
index 9fee0ad4de..61eae22d48 100644
--- a/sdk/go.mod
+++ b/sdk/go.mod
@@ -2,7 +2,7 @@ module github.com/hashicorp/boundary/sdk
 
 go 1.21
 
-toolchain go1.21.4
+toolchain go1.21.5
 
 require (
 	github.com/hashicorp/eventlogger v0.2.6-0.20231025104552-802587e608f0