diff --git a/requirements.txt b/requirements.txt
index 34bc066ff..61b9fcdef 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -18,5 +18,6 @@
 # FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 # IN THE SOFTWARE.
 
+mkdocs
 pygments
 pymdown-extensions