diff --git a/.plzconfig b/.plzconfig
index 037d898..b13b9ac 100644
--- a/.plzconfig
+++ b/.plzconfig
@@ -14,4 +14,4 @@ preloadbuilddefs = build_defs/go_mock_rule.build_defs
 
 [go]
 importpath = github.com/tcncloud/wollemi
-gotool = //tools/go:toolchain|go
\ No newline at end of file
+gotool = //tools/go:toolchain|go
diff --git a/BUILD.plz b/BUILD.plz
index 787338d..34cb83b 100644
--- a/BUILD.plz
+++ b/BUILD.plz
@@ -1,7 +1,12 @@
+subinclude("//build_defs:version")
+
 go_binary(
     name = "wollemi",
     srcs = ["main.go"],
     visibility = ["PUBLIC"],
+    definitions = {
+        "github.com/tcncloud/wollemi/ports/wollemi.WollemiVersion": VERSION,
+    },
     deps = [
         "//adapters/bazel",
         "//adapters/cobra",
diff --git a/adapters/cobra/root.go b/adapters/cobra/root.go
index 93aab32..34faebf 100644
--- a/adapters/cobra/root.go
+++ b/adapters/cobra/root.go
@@ -7,6 +7,7 @@ import (
 
 	"github.com/tcncloud/wollemi/ports/ctl"
 	"github.com/tcncloud/wollemi/ports/logging"
+	"github.com/tcncloud/wollemi/ports/wollemi"
 )
 
 func RootCmd(app ctl.Application) *cobra.Command {
@@ -16,8 +17,9 @@ func RootCmd(app ctl.Application) *cobra.Command {
 	)
 
 	cmd := &cobra.Command{
-		Use:   "wollemi",
-		Short: "cli for wollemi",
+		Use:     "wollemi",
+		Version: wollemi.WollemiVersion,
+		Short:   "cli for wollemi",
 		Long: Description(`
 			Please build file generator and formatter capable of generating go_binary,
 			go_library and go_test build rules from existing go code.
diff --git a/build_defs/BUILD.plz b/build_defs/BUILD.plz
new file mode 100644
index 0000000..eb1a093
--- /dev/null
+++ b/build_defs/BUILD.plz
@@ -0,0 +1,7 @@
+genrule(
+    name = "version",
+    srcs = ["VERSION"],
+    outs = ["version.build_defs"],
+    cmd = "echo \"VERSION = '`cat $SRCS`'\" > \"$OUT\"",
+    visibility = ["PUBLIC"],
+)
diff --git a/build_defs/VERSION b/build_defs/VERSION
new file mode 100644
index 0000000..7486fdb
--- /dev/null
+++ b/build_defs/VERSION
@@ -0,0 +1 @@
+0.7.2
diff --git a/ports/wollemi/version.go b/ports/wollemi/version.go
new file mode 100644
index 0000000..6c45082
--- /dev/null
+++ b/ports/wollemi/version.go
@@ -0,0 +1,5 @@
+package wollemi
+
+// WollemiVersion is the current version of wollemi.
+// Note that non-bootstrap builds replace this interim version with a real one.
+var WollemiVersion = "dev-0.0.9999"