diff --git a/composer.json b/composer.json
index c624ade..73eae71 100644
--- a/composer.json
+++ b/composer.json
@@ -12,9 +12,9 @@
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     "require": {
-        "php": "^7.3",
+        "php": "^7.1",
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+        "ext-json": "*"
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diff --git a/composer.lock b/composer.lock
index a33e7ab..a3406d1 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,20 +4,20 @@
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+    "content-hash": "fefb978716d3695ab583a0ae96628a52",
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             "name": "guzzlehttp/guzzle",
-            "version": "6.5.0",
+            "version": "6.5.2",
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                 "url": "https://github.com/guzzle/guzzle.git",
-                "reference": "dbc2bc3a293ed6b1ae08a3651e2bfd213d19b6a5"
+                "reference": "43ece0e75098b7ecd8d13918293029e555a50f82"
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-                "reference": "dbc2bc3a293ed6b1ae08a3651e2bfd213d19b6a5",
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@@ -71,7 +71,7 @@
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-            "time": "2019-12-07T18:20:45+00:00"
+            "time": "2019-12-23T11:57:10+00:00"
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@@ -345,16 +345,16 @@
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-            "version": "1.9.3",
+            "version": "1.9.5",
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                 "url": "https://github.com/myclabs/DeepCopy.git",
-                "reference": "007c053ae6f31bba39dfa19a7726f56e9763bbea"
+                "reference": "b2c28789e80a97badd14145fda39b545d83ca3ef"
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-                "reference": "007c053ae6f31bba39dfa19a7726f56e9763bbea",
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@@ -389,7 +389,7 @@
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-            "time": "2019-08-09T12:45:53+00:00"
+            "time": "2020-01-17T21:11:47+00:00"
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@@ -547,16 +547,16 @@
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+            "version": "4.3.4",
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                 "url": "https://github.com/phpDocumentor/ReflectionDocBlock.git",
-                "reference": "b83ff7cfcfee7827e1e78b637a5904fe6a96698e"
+                "reference": "da3fd972d6bafd628114f7e7e036f45944b62e9c"
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-                "reference": "b83ff7cfcfee7827e1e78b637a5904fe6a96698e",
+                "url": "https://api.github.com/repos/phpDocumentor/ReflectionDocBlock/zipball/da3fd972d6bafd628114f7e7e036f45944b62e9c",
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@@ -568,6 +568,7 @@
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+                "phpdocumentor/type-resolver": "0.4.*",
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@@ -594,7 +595,7 @@
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-            "time": "2019-09-12T14:27:41+00:00"
+            "time": "2019-12-28T18:55:12+00:00"
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@@ -645,33 +646,33 @@
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@@ -704,7 +705,7 @@
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-            "time": "2019-10-03T11:07:50+00:00"
+            "time": "2020-01-20T15:57:02+00:00"
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@@ -960,16 +961,16 @@
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+            "version": "7.5.20",
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@@ -1040,7 +1041,7 @@
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-            "time": "2019-12-06T05:14:37+00:00"
+            "time": "2020-01-08T08:45:45+00:00"
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@@ -1761,8 +1762,8 @@
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-        "php": "^7.3",
-        "ext-json": "^1.7"
+        "php": "^7.1",
+        "ext-json": "*"
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     "platform-dev": []
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