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diff --git a/timew-tagrename b/timew-tagrename
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+#!/usr/bin/env bash
+#
+# Timewarrior tag renames.
+#
+
+# Parameters
+BASENAME="`basename $0`"
+OLD="$1"
+NEW="$2"
+
+# Rename tag: use as timew-tagrename <oldtag> <newtag>
+# Based on from https://github.com/GothenburgBitFactory/timewarrior/issues/210
+function timew_tagrename() {
+  oldtag="$1"
+  newtag="$2"
+  idlist="$(timew summary 1970W01 - now "$oldtag" :ids | sed -nr 's/.* (@[0-9]+) .*/\1/p')"
+
+  timew tag   $idlist "$newtag"
+  timew untag $idlist "$oldtag"
+}
+
+# Check
+if [ -z "$NEW" ]; then
+  echo "usage: $BASENAME <old-tag> <new-tag>"
+  exit 1
+fi
+
+# Dispatch
+timew_tagrename $OLD $NEW