diff --git a/build/checksums.txt b/build/checksums.txt
index 9f4d7c1c1e..2eaef3aa19 100644
--- a/build/checksums.txt
+++ b/build/checksums.txt
@@ -5,20 +5,20 @@
 24bac679f3a2d8240d8e08e7f6a70b70c2dabf673317d924cf1d1887b9fe1f81  fixtures.tar.gz
 
 # https://go.dev/dl/
-45e59de173baec39481854490d665b726cec3e5b159f6b4172e5ec7780b2c201  go1.21.2.src.tar.gz
-31db09a0ebaf89a3efa15a84cc67d4a8b60ae4aace9e6818e453d72be64f76bd  go1.21.2.darwin-amd64.tar.gz
-7534d79f1955b57971092a91d2ce683fc49352c6130e2c9411357031c05437a4  go1.21.2.darwin-arm64.tar.gz
-3ac3c5e1ec1f42e8394ae0803c2ca5570ddc4026d82ddf9010a8bdd24e419a54  go1.21.2.freebsd-386.tar.gz
-63a0c772ba671b11a1da2df69424be051cfb3ea61017b28a32d41492e4114826  go1.21.2.freebsd-amd64.tar.gz
-e2ccb4121a328c3fa297c6d653cc0a625a06935313c2367f8e026c3af56869c5  go1.21.2.linux-386.tar.gz
-f5414a770e5e11c6e9674d4cd4dd1f4f630e176d1828d3427ea8ca4211eee90d  go1.21.2.linux-amd64.tar.gz
-23e208ca44a3cb46cd4308e48a27c714ddde9c8c34f2e4211dbca95b6d456554  go1.21.2.linux-arm64.tar.gz
-8727d842176a2bfd9edf307ed5411c39a69e2c6a748098987be361e8e0c36b46  go1.21.2.linux-armv6l.tar.gz
-429ae21664ee12fdddc9a04fd0646879da34d81fe3fd316d57250e7fd50e7c6b  go1.21.2.linux-ppc64le.tar.gz
-544c867180bf3384396b0906a7f14f4dc26bb7e78d4b05a8b45557b1b0ce0376  go1.21.2.linux-s390x.tar.gz
-499357f6dbf61aa3acd5a0277130b11eae871c4da49f3a6cddcdf6f6ccb434a7  go1.21.2.windows-386.zip
-2cd46db02477f33559a4ebf8a176c22879b43fdcfddb1542a23876054f26a83f  go1.21.2.windows-amd64.zip
-46cf055567c4ace410f0bb9937374c5c7e22e9194ad43635c953ca4238f471f0  go1.21.2.windows-arm64.zip
+186f2b6f8c8b704e696821b09ab2041a5c1ee13dcbc3156a13adcf75931ee488  go1.21.3.src.tar.gz
+27014fc69e301d7588a169ca239b3cc609f0aa1abf38528bf0d20d3b259211eb  go1.21.3.darwin-amd64.tar.gz
+65302a7a9f7a4834932b3a7a14cb8be51beddda757b567a2f9e0cbd0d7b5a6ab  go1.21.3.darwin-arm64.tar.gz
+8e0cd2f66cf1bde9d07b4aee01e3d7c3cfdd14e20650488e1683da4b8492594a  go1.21.3.freebsd-386.tar.gz
+6e74f65f586e93d1f3947894766f69e9b2ebda488592a09df61f36f06bfe58a8  go1.21.3.freebsd-amd64.tar.gz
+fb209fd070db500a84291c5a95251cceeb1723e8f6142de9baca5af70a927c0e  go1.21.3.linux-386.tar.gz
+1241381b2843fae5a9707eec1f8fb2ef94d827990582c7c7c32f5bdfbfd420c8  go1.21.3.linux-amd64.tar.gz
+fc90fa48ae97ba6368eecb914343590bbb61b388089510d0c56c2dde52987ef3  go1.21.3.linux-arm64.tar.gz
+a1ddcaaf0821a12a800884c14cb4268ce1c1f5a0301e9060646f1e15e611c6c7  go1.21.3.linux-armv6l.tar.gz
+3b0e10a3704f164a6e85e0377728ec5fd21524fabe4c925610e34076586d5826  go1.21.3.linux-ppc64le.tar.gz
+4c78e2e6f4c684a3d5a9bdc97202729053f44eb7be188206f0627ef3e18716b6  go1.21.3.linux-s390x.tar.gz
+e36737f4f2fadb4d2f919ec4ce517133a56e06064cca6e82fc883bb000c4d56c  go1.21.3.windows-386.zip
+27c8daf157493f288d42a6f38debc6a2cb391f6543139eba9152fceca0be2a10  go1.21.3.windows-amd64.zip
+bfb7a5c56f9ded07d8ae0e0b3702ac07b65e68fa8f33da24ed6df4ce01fe2c5c  go1.21.3.windows-arm64.zip
 
 # https://github.com/golangci/golangci-lint/releases/
 # https://github.com/golangci/golangci-lint/releases/download/v1.51.1/
diff --git a/build/ci.go b/build/ci.go
index 77d91898ef..645229118e 100644
--- a/build/ci.go
+++ b/build/ci.go
@@ -139,7 +139,7 @@ var (
 	// This is the version of Go that will be downloaded by
 	//
 	//     go run ci.go install -dlgo
-	dlgoVersion = "1.21.2"
+	dlgoVersion = "1.21.3"
 
 	// This is the version of Go that will be used to bootstrap the PPA builder.
 	//