diff --git a/build/go.mod b/build/go.mod
index 62ee26a..d4e59a6 100644
--- a/build/go.mod
+++ b/build/go.mod
@@ -1,6 +1,7 @@
 module github.com/zrepl/zrepl/build
 
-go 1.25.6
+go 1.24.12
+toolchain go1.25.6
 
 require (
 	github.com/alvaroloes/enumer v1.1.2
diff --git a/docs/changelog.rst b/docs/changelog.rst
index 8e300b2..5b0b059 100644
--- a/docs/changelog.rst
+++ b/docs/changelog.rst
@@ -45,7 +45,7 @@ There will be beta/RC releases to give users a chance to evaluate.
 
 INCOMPLETE LIST OF CHANGES
 
-* |maint| Update to Go 1.25.
+* |maint| Update to Go 1.25 toolchain with Go 1.24 language level.
 * |maint| Fix deprecations exposed by the toolchain update.
 * |maint| Long-overdue update of all our dependencies & address deprecations.
 * |maint| The `make release-docker` in CircleCI produces executables that are bit-identical to my personal machine.
diff --git a/go.mod b/go.mod
index fd18b1a..1a6e9c6 100644
--- a/go.mod
+++ b/go.mod
@@ -1,6 +1,7 @@
 module github.com/zrepl/zrepl
 
-go 1.25.6
+go 1.24.12
+toolchain go1.25.6
 
 require (
 	github.com/bits-and-blooms/bitset v1.24.4