diff --git a/CHANGELOG.md b/CHANGELOG.md
index fce3a00..e2fde94 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -28,6 +28,7 @@
   blocking #47. (#100)
 + Moved javascript out of HTML files. (#47)
 + The tree is now auto-expanded by default. (#105)
++ The program version is now displayed on all pages. (#109)
 
 
 ## v0.3.0 (2019-01-28)
diff --git a/src/trendlines/routes.py b/src/trendlines/routes.py
index f7231fc..16b0cc0 100644
--- a/src/trendlines/routes.py
+++ b/src/trendlines/routes.py
@@ -3,10 +3,11 @@
 import json
 from datetime import datetime
 from datetime import timezone
+from functools import partial
 
 from flask import Blueprint
 from flask import jsonify
-from flask import render_template
+from flask import render_template as _render_template
 from flask import request
 
 # peewee
@@ -16,6 +17,7 @@
 from playhouse.shortcuts import update_model_from_dict
 
 from trendlines import logger
+from trendlines.__about__ import __version__
 from . import db
 from .error_responses import ErrorResponse
 from . import utils
@@ -24,6 +26,10 @@
 api = Blueprint('api', __name__)
 
 
+# Make sure all pages show our version.
+render_template = partial(_render_template, version=__version__)
+
+
 @pages.route('/', methods=['GET'])
 def index():
     """
diff --git a/src/trendlines/templates/trendlines/layout.html b/src/trendlines/templates/trendlines/layout.html
index 5c0cd6b..edb78d4 100644
--- a/src/trendlines/templates/trendlines/layout.html
+++ b/src/trendlines/templates/trendlines/layout.html
@@ -23,6 +23,7 @@
 
   <main>
   <h1><a href="{{ url_for('pages.index') }}">Trendlines</a></h1>
+  <h4>v{{ version }}</h4>
 
     <div id="content">
       {% block body %}