diff --git a/Pipfile.lock b/Pipfile.lock
index 4b58835..5a3a05d 100644
--- a/Pipfile.lock
+++ b/Pipfile.lock
@@ -27,10 +27,10 @@
         },
         "certifi": {
             "hashes": [
-                "sha256:13e698f54293db9f89122b0581843a782ad0934a4fe0172d2a980ba77fc61bb7",
-                "sha256:9fa520c1bacfb634fa7af20a76bcbd3d5fb390481724c597da32c719a7dca4b0"
+                "sha256:1a4995114262bffbc2413b159f2a1a480c969de6e6eb13ee966d470af86af59c",
+                "sha256:719a74fb9e33b9bd44cc7f3a8d94bc35e4049deebe19ba7d8e108280cfd59830"
             ],
-            "version": "==2018.4.16"
+            "version": "==2020.12.5"
         },
         "chardet": {
             "hashes": [
@@ -65,25 +65,24 @@
     "develop": {
         "atomicwrites": {
             "hashes": [
-                "sha256:240831ea22da9ab882b551b31d4225591e5e447a68c5e188db5b89ca1d487585",
-                "sha256:a24da68318b08ac9c9c45029f4a10371ab5b20e4226738e150e6e7c571630ae6"
+                "sha256:6d1784dea7c0c8d4a5172b6c620f40b6e4cbfdf96d783691f2e1302a7b88e197",
+                "sha256:ae70396ad1a434f9c7046fd2dd196fc04b12f9e91ffb859164193be8b6168a7a"
             ],
-            "version": "==1.1.5"
+            "version": "==1.4.0"
         },
         "attrs": {
             "hashes": [
-                "sha256:4b90b09eeeb9b88c35bc642cbac057e45a5fd85367b985bd2809c62b7b939265",
-                "sha256:e0d0eb91441a3b53dab4d9b743eafc1ac44476296a2053b6ca3af0b139faf87b"
+                "sha256:31b2eced602aa8423c2aea9c76a724617ed67cf9513173fd3a4f03e3a929c7e6",
+                "sha256:832aa3cde19744e49938b91fea06d69ecb9e649c93ba974535d08ad92164f700"
             ],
-            "version": "==18.1.0"
+            "version": "==20.3.0"
         },
         "more-itertools": {
             "hashes": [
-                "sha256:2b6b9893337bfd9166bee6a62c2b0c9fe7735dcf85948b387ec8cba30e85d8e8",
-                "sha256:6703844a52d3588f951883005efcf555e49566a48afd4db4e965d69b883980d3",
-                "sha256:a18d870ef2ffca2b8463c0070ad17b5978056f403fb64e3f15fe62a52db21cc0"
+                "sha256:5652a9ac72209ed7df8d9c15daf4e1aa0e3d2ccd3c87f8265a0673cd9cbc9ced",
+                "sha256:c5d6da9ca3ff65220c3bfd2a8db06d698f05d4d2b9be57e1deb2be5a45019713"
             ],
-            "version": "==4.2.0"
+            "version": "==8.7.0"
         },
         "pluggy": {
             "hashes": [
@@ -95,10 +94,11 @@
         },
         "py": {
             "hashes": [
-                "sha256:29c9fab495d7528e80ba1e343b958684f4ace687327e6f789a94bf3d1915f881",
-                "sha256:983f77f3331356039fdd792e9220b7b8ee1aa6bd2b25f567a963ff1de5a64f6a"
+                "sha256:21b81bda15b66ef5e1a777a21c4dcd9c20ad3efd0b3f817e7a809035269e1bd3",
+                "sha256:3b80836aa6d1feeaa108e046da6423ab8f6ceda6468545ae8d02d9d58d18818a"
             ],
-            "version": "==1.5.3"
+            "index": "pypi",
+            "version": "==1.10.0"
         },
         "pytest": {
             "hashes": [
@@ -110,10 +110,10 @@
         },
         "six": {
             "hashes": [
-                "sha256:70e8a77beed4562e7f14fe23a786b54f6296e34344c23bc42f07b15018ff98e9",
-                "sha256:832dc0e10feb1aa2c68dcc57dbb658f1c7e65b9b61af69048abc87a2db00a0eb"
+                "sha256:30639c035cdb23534cd4aa2dd52c3bf48f06e5f4a941509c8bafd8ce11080259",
+                "sha256:8b74bedcbbbaca38ff6d7491d76f2b06b3592611af620f8426e82dddb04a5ced"
             ],
-            "version": "==1.11.0"
+            "version": "==1.15.0"
         }
     }
 }
diff --git a/requirements-dev.txt b/requirements-dev.txt
index fac0775..783401c 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -1,8 +1,8 @@
--i https://pypi.org/simple
-atomicwrites==1.1.5
-attrs==18.1.0
-more-itertools==4.2.0
+-i https://pypi.org/simple/
+atomicwrites==1.4.0
+attrs==20.3.0
+more-itertools==8.7.0
 pluggy==0.6.0
-py==1.5.3
+py==1.10.0
 pytest==3.6.2
-six==1.11.0
+six==1.15.0
diff --git a/requirements.txt b/requirements.txt
index 004794c..2680a83 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,6 +1,6 @@
--i https://pypi.org/simple
+-i https://pypi.org/simple/
 beautifulsoup4==4.6.0
-certifi==2018.4.16
+certifi==2020.12.5
 chardet==3.0.4
 idna==2.7
 requests==2.19.1