diff --git a/bump-tag b/bump-tag
new file mode 100755
index 0000000..35d0c45
--- /dev/null
+++ b/bump-tag
@@ -0,0 +1,56 @@
+#!/bin/bash
+
+set -e
+
+test -f cosmos.conf && . ./cosmos.conf
+
+echo "Fetching any updates from server:"
+git pull
+echo ""
+
+if [ "x$1" = "x" ]; then
+    deftag=`basename $PWD`
+else
+    deftag="$1"
+fi
+tagpfx=${tag:="$deftag"}
+
+last_tag=`git tag -l "${tagpfx}-*"|sort|tail -1`
+
+echo "Verifying last tag $last_tag:"
+(git tag -v $last_tag | grep ^gpg:) || true
+# again to not mask exit status of git with grep
+git tag -v $last_tag > /dev/null 2>&1
+echo ""
+
+echo "Differences between tag $last_tag and what you are about to sign:"
+PAGER=cat git diff --color $last_tag..main
+
+iter=1
+ok=
+while test -z "$ok"; do
+    this_tag=$(date +${tagpfx}-%Y-%m-%d-v`printf "%02d" $iter`)
+    iter=`expr $iter + 1`
+    case `(echo $this_tag; echo $last_tag) | sort | tail -1` in
+	$last_tag)
+	    ;;
+	$this_tag)
+	    ok=yes
+	    ;;
+    esac
+done
+
+if [ "$deftag" != "$tagpfx" ]; then
+    echo -e "Using new tag \e[94m$this_tag\e[0m according to pattern in cosmos.conf"
+else
+    echo -e "Using new tag \e[94m$this_tag\e[0m"
+fi
+
+echo -e "\e[1mONLY SIGN IF YOU APPROVE OF VERIFICATION AND DIFF ABOVE\e[0m"
+
+# GITTAGEXTRA is for putting things like "-u 2117364A"
+
+git tag $GITTAGEXTRA -m bump. -s $this_tag
+
+git push
+git push --tags