diff --git a/scripts/build.sh b/scripts/build.sh
index ad2521d..b0314c9 100755
--- a/scripts/build.sh
+++ b/scripts/build.sh
@@ -2,10 +2,15 @@
 
 set -e
 
+if [ -n "$1" ]; then
+    printf "Attaching tag: %s\n" "$1"
+    tag=":$1"
+fi
+
 if which podman 2>&1 >/dev/null; then
-    podman build -t docker.io/jsks/conflict_onset .
-    podman push docker.io/jsks/conflict_onset
+    podman build -t "docker.io/jsks/conflict_onset$tag" .
+    podman push "docker.io/jsks/conflict_onset$tag"
 else
-    docker build -t jsks/conflict_onset:latest .
-    docker push jsks/conflict_onset
+    docker build -t "jsks/conflict_onset$tag" .
+    docker push "jsks/conflict_onset$tag"
 fi
diff --git a/scripts/semver.sh b/scripts/semver.sh
new file mode 100755
index 0000000..582e6d7
--- /dev/null
+++ b/scripts/semver.sh
@@ -0,0 +1,95 @@
+#!/bin/sh
+
+## Utility functions
+usage() {
+    printf "Usage: ./$(basename $0) [-h] [-m <msg>] [-s <semver>]\n"
+    exit 127
+}
+
+help() {
+cat <<EOF
+$(usage)
+
+Sets the project-wide version number. If not specified, default to
+bumping the current patch version.
+
+Options:
+        -h Useless help message
+        -m Tagging message
+        -s Specify version number
+EOF
+
+exit
+}
+
+confirm() {
+    printf "$*. Continue (y/n)? "
+    read ans
+
+    case $ans in
+        [Yy] | Yes | yes)
+            return 0;;
+        *)
+            return 1;;
+    esac
+}
+
+validate() {
+    if ! grep -E '^[0-9]+[.][0-9]+[.][0-9]+$' <<< "$1" >/dev/null; then
+        printf "Invalid semver: %s\n" "$1"
+        exit 127
+    fi
+
+    IFS=.
+    read major minor patch <<< "$tag"
+    read next_major next_minor next_patch <<< "$1"
+    IFS=""
+
+    if (( next_major < major )) ||
+           (( next_minor < minor )) ||
+           (( next_patch <= patch )); then
+        printf "Current version %s >= %s\n" "$tag" "$1"
+        exit 127
+    fi
+}
+
+## Main
+if [ -n "$(git diff --name-only --staged)" ]; then
+    printf "Finish commit before updating version number\n"
+    exit 127
+fi
+
+if [ -n "$(git status -s)" ] && ! confirm "Uncommitted changes"; then
+    exit 127
+fi
+
+root=$(git rev-parse --show-toplevel)
+tag=$(git describe --tags --abbrev=0 2>/dev/null | cut -c 2-)
+: ${tag:="0.0.0"}
+
+next_version="${tag%.*}.$(( ${tag##*.} + 1 ))"
+
+while getopts 'hs:' opt; do
+    case $opt in
+        h)
+            help;;
+        m)
+            msg=$OPTARG;;
+        s)
+            validate $OPTARG
+            next_version=$OPTARG;;
+        *)
+            usage;;
+    esac
+done
+
+set -e
+confirm "Bumping version to v$next_version"
+
+sed -i "s/Version:.*/Version: $next_version/" $root/R/thesis.utils/DESCRIPTION
+git add $root/R/thesis.utils/DESCRIPTION
+git commit -m "Prepare release v$next_version"
+
+git tag -a "v$next_version" -m $msg
+
+sh $root/scripts/build.sh