diff --git a/.github/workflows/build_daily.yaml b/.github/workflows/build_daily.yaml
index 0042f1b7abe..1c7e9459687 100644
--- a/.github/workflows/build_daily.yaml
+++ b/.github/workflows/build_daily.yaml
@@ -10,7 +10,7 @@ on:
 env:
   GOPROXY: https://proxy.golang.org/
   SLACK_WEBHOOK_URL: ${{ secrets.SLACK_WEBHOOK_URL }}
-  GO_VERSION: 1.20.7
+  GO_VERSION: 1.21.0
 jobs:
   e2e-envoy-xds:
     runs-on: ubuntu-latest
diff --git a/.github/workflows/prbuild.yaml b/.github/workflows/prbuild.yaml
index ee61c159426..c63f538c9b2 100644
--- a/.github/workflows/prbuild.yaml
+++ b/.github/workflows/prbuild.yaml
@@ -11,7 +11,7 @@ on:
 env:
   GOPROXY: https://proxy.golang.org/
   SLACK_WEBHOOK_URL: ${{ secrets.SLACK_WEBHOOK_URL }}
-  GO_VERSION: 1.20.7
+  GO_VERSION: 1.21.0
 jobs:
   lint:
     runs-on: ubuntu-latest
diff --git a/Makefile b/Makefile
index 25fc6133523..cace074152d 100644
--- a/Makefile
+++ b/Makefile
@@ -44,7 +44,7 @@ endif
 IMAGE_PLATFORMS ?= linux/amd64,linux/arm64
 
 # Base build image to use.
-BUILD_BASE_IMAGE ?= golang:1.20.7
+BUILD_BASE_IMAGE ?= golang:1.21.0
 
 # Enable build with CGO.
 BUILD_CGO_ENABLED ?= 0
diff --git a/changelogs/unreleased/5731-skriss-small.md b/changelogs/unreleased/5731-skriss-small.md
new file mode 100644
index 00000000000..b4108a89e00
--- /dev/null
+++ b/changelogs/unreleased/5731-skriss-small.md
@@ -0,0 +1 @@
+Updates to Go 1.21.0. See the [Go release notes](https://go.dev/doc/devel/release#go1.21) for more information.
\ No newline at end of file