diff --git a/Pipfile b/Pipfile
index 83882a0..4290911 100644
--- a/Pipfile
+++ b/Pipfile
@@ -10,6 +10,7 @@ ipython = "*"
 [packages]
 pandas = "*"
 python-stdnum = "*"
+xlrd = "*"
 
 [requires]
 python_version = "3.7"
diff --git a/Pipfile.lock b/Pipfile.lock
index 367cdf4..af51879 100644
--- a/Pipfile.lock
+++ b/Pipfile.lock
@@ -1,7 +1,7 @@
 {
     "_meta": {
         "hash": {
-            "sha256": "034e55aa1d397a7ba9037c558224121a3fa2998a7dba82d94bbc91a0769d07fa"
+            "sha256": "c98ad40f5fc15aaa49f63af944091f7a11cf3d0ee1184f4e9dd927913155c011"
         },
         "pipfile-spec": 6,
         "requires": {
@@ -85,6 +85,14 @@
                 "sha256:d16a0141ec1a18405cd4ce8b4613101da75da0e9a7aec5bdd4fa804d0e0eba73"
             ],
             "version": "==1.12.0"
+        },
+        "xlrd": {
+            "hashes": [
+                "sha256:546eb36cee8db40c3eaa46c351e67ffee6eeb5fa2650b71bc4c758a29a1b29b2",
+                "sha256:e551fb498759fa3a5384a94ccd4c3c02eb7c00ea424426e212ac0c57be9dfbde"
+            ],
+            "index": "pypi",
+            "version": "==1.2.0"
         }
     },
     "develop": {