diff --git a/composer.json b/composer.json
index 7d17233d9d3..11cf3435de9 100644
--- a/composer.json
+++ b/composer.json
@@ -14,7 +14,7 @@
     "woocommerce/woocommerce-rest-api": "1.0.4"
   },
   "require-dev": {
-    "phpunit/phpunit": "^7.5.18",
+    "phpunit/phpunit": "7.5.18",
     "woocommerce/woocommerce-sniffs": "0.0.9"
   },
   "config": {
diff --git a/composer.lock b/composer.lock
index 40d0135a786..9db6bd4b722 100644
--- a/composer.lock
+++ b/composer.lock
@@ -377,16 +377,16 @@
         },
         {
             "name": "myclabs/deep-copy",
-            "version": "1.9.3",
+            "version": "1.9.4",
             "source": {
                 "type": "git",
                 "url": "https://github.com/myclabs/DeepCopy.git",
-                "reference": "007c053ae6f31bba39dfa19a7726f56e9763bbea"
+                "reference": "579bb7356d91f9456ccd505f24ca8b667966a0a7"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/myclabs/DeepCopy/zipball/007c053ae6f31bba39dfa19a7726f56e9763bbea",
-                "reference": "007c053ae6f31bba39dfa19a7726f56e9763bbea",
+                "url": "https://api.github.com/repos/myclabs/DeepCopy/zipball/579bb7356d91f9456ccd505f24ca8b667966a0a7",
+                "reference": "579bb7356d91f9456ccd505f24ca8b667966a0a7",
                 "shasum": ""
             },
             "require": {
@@ -421,7 +421,7 @@
                 "object",
                 "object graph"
             ],
-            "time": "2019-08-09T12:45:53+00:00"
+            "time": "2019-12-15T19:12:40+00:00"
         },
         {
             "name": "phar-io/manifest",
@@ -837,33 +837,33 @@
         },
         {
             "name": "phpspec/prophecy",
-            "version": "1.9.0",
+            "version": "1.10.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/phpspec/prophecy.git",
-                "reference": "f6811d96d97bdf400077a0cc100ae56aa32b9203"
+                "reference": "d638ebbb58daba25a6a0dc7969e1358a0e3c6682"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/phpspec/prophecy/zipball/f6811d96d97bdf400077a0cc100ae56aa32b9203",
-                "reference": "f6811d96d97bdf400077a0cc100ae56aa32b9203",
+                "url": "https://api.github.com/repos/phpspec/prophecy/zipball/d638ebbb58daba25a6a0dc7969e1358a0e3c6682",
+                "reference": "d638ebbb58daba25a6a0dc7969e1358a0e3c6682",
                 "shasum": ""
             },
             "require": {
                 "doctrine/instantiator": "^1.0.2",
                 "php": "^5.3|^7.0",
                 "phpdocumentor/reflection-docblock": "^2.0|^3.0.2|^4.0|^5.0",
-                "sebastian/comparator": "^1.1|^2.0|^3.0",
+                "sebastian/comparator": "^1.2.3|^2.0|^3.0",
                 "sebastian/recursion-context": "^1.0|^2.0|^3.0"
             },
             "require-dev": {
-                "phpspec/phpspec": "^2.5|^3.2",
+                "phpspec/phpspec": "^2.5 || ^3.2",
                 "phpunit/phpunit": "^4.8.35 || ^5.7 || ^6.5 || ^7.1"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "1.8.x-dev"
+                    "dev-master": "1.10.x-dev"
                 }
             },
             "autoload": {
@@ -896,7 +896,7 @@
                 "spy",
                 "stub"
             ],
-            "time": "2019-10-03T11:07:50+00:00"
+            "time": "2019-12-17T16:54:23+00:00"
         },
         {
             "name": "phpunit/php-code-coverage",