diff --git a/.go-version b/.go-version
index 26d7b6e75..0c5bf37ca 100644
--- a/.go-version
+++ b/.go-version
@@ -1 +1 @@
-1.21.12
+1.21.13
diff --git a/functional/scripts/docker-local-agent.sh b/functional/scripts/docker-local-agent.sh
index 60bf135db..dbcded83b 100755
--- a/functional/scripts/docker-local-agent.sh
+++ b/functional/scripts/docker-local-agent.sh
@@ -13,7 +13,7 @@ if ! [[ "${0}" =~ "scripts/docker-local-agent.sh" ]]; then
 fi
 
 if [[ -z "${GO_VERSION}" ]]; then
-  GO_VERSION=1.21.12
+  GO_VERSION=1.21.13
 fi
 echo "Running with GO_VERSION:" ${GO_VERSION}
 
diff --git a/functional/scripts/docker-local-tester.sh b/functional/scripts/docker-local-tester.sh
index 9d1677a4e..cf3889da5 100755
--- a/functional/scripts/docker-local-tester.sh
+++ b/functional/scripts/docker-local-tester.sh
@@ -6,7 +6,7 @@ if ! [[ "${0}" =~ "scripts/docker-local-tester.sh" ]]; then
 fi
 
 if [[ -z "${GO_VERSION}" ]]; then
-  GO_VERSION=1.21.12
+  GO_VERSION=1.21.13
 fi
 echo "Running with GO_VERSION:" ${GO_VERSION}
 
diff --git a/go.mod b/go.mod
index d76fa1692..b1e7643a6 100644
--- a/go.mod
+++ b/go.mod
@@ -2,7 +2,7 @@ module go.etcd.io/etcd
 
 go 1.21
 
-toolchain go1.21.12
+toolchain go1.21.13
 
 require (
 	github.com/bgentry/speakeasy v0.1.0
diff --git a/tools/mod/go.mod b/tools/mod/go.mod
index 250d8671d..d8b7c0cfe 100644
--- a/tools/mod/go.mod
+++ b/tools/mod/go.mod
@@ -2,7 +2,7 @@ module go.etcd.io/etcd/tools/v3
 
 go 1.21
 
-toolchain go1.21.12
+toolchain go1.21.13
 
 require (
 	github.com/gogo/protobuf v1.3.2