diff --git a/Pipfile b/Pipfile
index 3a8280e..2d5472b 100644
--- a/Pipfile
+++ b/Pipfile
@@ -9,3 +9,4 @@ pydata-sphinx-theme = "0.13.3"
 make = "*"
 pytz = "*"
 sphinxcontrib-wavedrom = "*"
+jinja2 = "*"
diff --git a/Pipfile.lock b/Pipfile.lock
index c724f7a..fbae34d 100644
--- a/Pipfile.lock
+++ b/Pipfile.lock
@@ -1,7 +1,7 @@
 {
     "_meta": {
         "hash": {
-            "sha256": "f9a71382569b84588c66f5030041b9029792f0314fb8b27f0de2500719a15172"
+            "sha256": "0deae1400159e78250a746c492ff39cf5b811094770d191921c1cba5d84c3c9b"
         },
         "pipfile-spec": 6,
         "requires": {},
@@ -282,11 +282,12 @@
         },
         "jinja2": {
             "hashes": [
-                "sha256:7d6d50dd97d52cbc355597bd845fabfbac3f551e1f99619e39a35ce8c370b5fa",
-                "sha256:ac8bd6544d4bb2c9792bf3a159e80bba8fda7f07e81bc3aed565432d5925ba90"
+                "sha256:4a3aee7acbbe7303aede8e9648d13b8bf88a429282aa6122a993f0ac800cb369",
+                "sha256:bc5dd2abb727a5319567b7a813e6a2e7318c39f4f487cfe6c89c6f9c7d25197d"
             ],
+            "index": "pypi",
             "markers": "python_version >= '3.7'",
-            "version": "==3.1.3"
+            "version": "==3.1.4"
         },
         "jinja2-time": {
             "hashes": [