diff --git a/.buildkite/Dockerfile-compile b/.buildkite/Dockerfile-compile
index 0da13fbcfd..4d643fcbe2 100644
--- a/.buildkite/Dockerfile-compile
+++ b/.buildkite/Dockerfile-compile
@@ -1,4 +1,4 @@
-FROM public.ecr.aws/docker/library/golang:1.25.12@sha256:fe5d57d3b718e7a4986bae156c2d73f44973bfd313073aed08a4de6692bb6161
+FROM public.ecr.aws/docker/library/golang:1.26.5@sha256:3aff6657219a4d9c14e27fb1d8976c49c29fddb70ba835014f477e1c70636647
 COPY build/ssh.conf /etc/ssh/ssh_config.d/
 
 RUN go install github.com/google/go-licenses@latest
diff --git a/.buildkite/Dockerfile-e2e b/.buildkite/Dockerfile-e2e
index 59a462b418..3e19d93f06 100644
--- a/.buildkite/Dockerfile-e2e
+++ b/.buildkite/Dockerfile-e2e
@@ -1,4 +1,4 @@
-FROM public.ecr.aws/docker/library/golang:1.25.12@sha256:fe5d57d3b718e7a4986bae156c2d73f44973bfd313073aed08a4de6692bb6161
+FROM public.ecr.aws/docker/library/golang:1.26.5@sha256:3aff6657219a4d9c14e27fb1d8976c49c29fddb70ba835014f477e1c70636647
 
 RUN apt-get update && apt-get install -y --no-install-recommends \
     unzip \
diff --git a/go.mod b/go.mod
index 9c875f1209..b0c5f6c43b 100644
--- a/go.mod
+++ b/go.mod
@@ -1,6 +1,6 @@
 module github.com/buildkite/agent/v4
 
-go 1.25.12
+go 1.26.5
 
 require (
 	buf.build/gen/go/bufbuild/protovalidate/protocolbuffers/go v1.36.12-20260709200747-435963d16310.1
diff --git a/mise.toml b/mise.toml
index b14a5e1727..39bc7047eb 100644
--- a/mise.toml
+++ b/mise.toml
@@ -1,5 +1,5 @@
 [tools]
-go = "1.25.12"
+go = "1.26.5"
 golangci-lint = "2.9.0"
 ruby = "3.4.9"