diff --git a/MODULE.bazel b/MODULE.bazel
index 4e4e711..27f58f7 100644
--- a/MODULE.bazel
+++ b/MODULE.bazel
@@ -1,11 +1,11 @@
-module(name = "jsonnet_go", version = "0.0.0")
+module(name = "jsonnet_go", version = "0.21.0-rc1")
 
 http_archive = use_repo_rule("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")
 
 # NB: update_cpp_jsonnet.sh looks for these.
-CPP_JSONNET_SHA256 = "e7d14d8ad65dc334b9a9f3bd1c542a82b3b80029860a8d78fd829b23d0e9845b"
-CPP_JSONNET_GITHASH = "5a4e8e34cc1fe841bdebb983646b9b9ae8fa8ca4"
-CPP_JSONNET_RELEASE_VERSION = ""
+CPP_JSONNET_SHA256 = "f104659d3feb42c871d40c5142577dff2cd3b2eda33ac9534f5f12b14643748d"
+CPP_JSONNET_GITHASH = "2c3b51491a67ab7b24aecfc23fa3f73f68135129"
+CPP_JSONNET_RELEASE_VERSION = "v0.21.0-rc1"
 
 CPP_JSONNET_STRIP_PREFIX = (
     "jsonnet-" + (
diff --git a/bazel/repositories.bzl b/bazel/repositories.bzl
index 33df466..9c17ae7 100644
--- a/bazel/repositories.bzl
+++ b/bazel/repositories.bzl
@@ -4,9 +4,9 @@ load(
 )
 
 # NB: update_cpp_jsonnet.sh looks for these.
-CPP_JSONNET_SHA256 = "e7d14d8ad65dc334b9a9f3bd1c542a82b3b80029860a8d78fd829b23d0e9845b"
-CPP_JSONNET_GITHASH = "5a4e8e34cc1fe841bdebb983646b9b9ae8fa8ca4"
-CPP_JSONNET_RELEASE_VERSION = ""
+CPP_JSONNET_SHA256 = "f104659d3feb42c871d40c5142577dff2cd3b2eda33ac9534f5f12b14643748d"
+CPP_JSONNET_GITHASH = "2c3b51491a67ab7b24aecfc23fa3f73f68135129"
+CPP_JSONNET_RELEASE_VERSION = "v0.21.0-rc1"
 
 CPP_JSONNET_STRIP_PREFIX = (
     "jsonnet-" + (
diff --git a/cpp-jsonnet b/cpp-jsonnet
index 5a4e8e3..2c3b514 160000
--- a/cpp-jsonnet
+++ b/cpp-jsonnet
@@ -1 +1 @@
-Subproject commit 5a4e8e34cc1fe841bdebb983646b9b9ae8fa8ca4
+Subproject commit 2c3b51491a67ab7b24aecfc23fa3f73f68135129
diff --git a/testdata/cpp-tests-override/fmt_help.golden.stdout b/testdata/cpp-tests-override/fmt_help.golden.stdout
index 15099d8..eada66a 100644
--- a/testdata/cpp-tests-override/fmt_help.golden.stdout
+++ b/testdata/cpp-tests-override/fmt_help.golden.stdout
@@ -1,4 +1,4 @@
-Jsonnet reformatter v0.20.0
+Jsonnet reformatter v0.21.0-rc1
 
 jsonnetfmt {<option>} { <filename> }
 
diff --git a/testdata/cpp-tests-override/fmt_no_args.golden.stderr b/testdata/cpp-tests-override/fmt_no_args.golden.stderr
index fad3fe8..6d485e3 100644
--- a/testdata/cpp-tests-override/fmt_no_args.golden.stderr
+++ b/testdata/cpp-tests-override/fmt_no_args.golden.stderr
@@ -1,6 +1,6 @@
 ERROR: must give filename
 
-Jsonnet reformatter v0.20.0
+Jsonnet reformatter v0.21.0-rc1
 
 jsonnetfmt {<option>} { <filename> }
 
diff --git a/vm.go b/vm.go
index f619632..c6b20d8 100644
--- a/vm.go
+++ b/vm.go
@@ -176,7 +176,7 @@ const (
 )
 
 // version is the current gojsonnet's version
-const version = "v0.20.0"
+const version = "v0.21.0-rc1"
 
 // Evaluate evaluates a Jsonnet program given by an Abstract Syntax Tree
 // and returns serialized JSON as string.