diff --git a/composer.lock b/composer.lock
index f57f821..c10c1cf 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "7c6933e3983cf62d2e5109374e0740e4",
+    "content-hash": "ff5b12e3aa2f39af4160d74d82ff7fa8",
     "packages": [
         {
             "name": "asimlqt/php-google-spreadsheet-client",
@@ -518,16 +518,16 @@
         },
         {
             "name": "phpseclib/phpseclib",
-            "version": "2.0.23",
+            "version": "2.0.31",
             "source": {
                 "type": "git",
                 "url": "https://github.com/phpseclib/phpseclib.git",
-                "reference": "c78eb5058d5bb1a183133c36d4ba5b6675dfa099"
+                "reference": "233a920cb38636a43b18d428f9a8db1f0a1a08f4"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/phpseclib/phpseclib/zipball/c78eb5058d5bb1a183133c36d4ba5b6675dfa099",
-                "reference": "c78eb5058d5bb1a183133c36d4ba5b6675dfa099",
+                "url": "https://api.github.com/repos/phpseclib/phpseclib/zipball/233a920cb38636a43b18d428f9a8db1f0a1a08f4",
+                "reference": "233a920cb38636a43b18d428f9a8db1f0a1a08f4",
                 "shasum": ""
             },
             "require": {
@@ -535,8 +535,7 @@
             },
             "require-dev": {
                 "phing/phing": "~2.7",
-                "phpunit/phpunit": "^4.8.35|^5.7|^6.0",
-                "sami/sami": "~2.0",
+                "phpunit/phpunit": "^4.8.35|^5.7|^6.0|^9.4",
                 "squizlabs/php_codesniffer": "~2.0"
             },
             "suggest": {
@@ -606,7 +605,25 @@
                 "x.509",
                 "x509"
             ],
-            "time": "2019-09-17T03:41:22+00:00"
+            "support": {
+                "issues": "https://github.com/phpseclib/phpseclib/issues",
+                "source": "https://github.com/phpseclib/phpseclib/tree/2.0.31"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/terrafrost",
+                    "type": "github"
+                },
+                {
+                    "url": "https://www.patreon.com/phpseclib",
+                    "type": "patreon"
+                },
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/phpseclib/phpseclib",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2021-04-06T13:56:45+00:00"
         },
         {
             "name": "psr/cache",
@@ -798,6 +815,9 @@
     "stability-flags": [],
     "prefer-stable": false,
     "prefer-lowest": false,
-    "platform": [],
-    "platform-dev": []
+    "platform": {
+        "ext-json": "*"
+    },
+    "platform-dev": [],
+    "plugin-api-version": "2.0.0"
 }