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 b04ca7710e..8465376ae8 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/go-cleanhttp v0.5.2
diff --git a/sdk/go.mod b/sdk/go.mod
index 4892bfca59..3cf84aff1e 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 v0.1.2-0.20230428153751-cca445805f24