diff --git a/composer.json b/composer.json
index e05fe92..dcfb494 100644
--- a/composer.json
+++ b/composer.json
@@ -8,7 +8,7 @@
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+        "php": "^7.3 || ~8.0.0"
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@@ -18,10 +18,10 @@
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-        "laminas/laminas-cache-storage-adapter-test": "^1.0.2",
+        "laminas/laminas-cache-storage-adapter-test": "^1.1",
         "laminas/laminas-coding-standard": "~1.0.0",
-        "squizlabs/php_codesniffer": "^2.7",
-        "phpunit/phpunit": "^7.5.20"
+        "phpunit/phpunit": "^9.5",
+        "squizlabs/php_codesniffer": "^2.7"
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     "suggest": {
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diff --git a/composer.lock b/composer.lock
index 5c6455d..ab4f45e 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,35 +4,38 @@
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+    "content-hash": "1ee980934de2aa8b572beb2742b1c2be",
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         {
             "name": "cache/integration-tests",
-            "version": "0.16.0",
+            "version": "0.17.0",
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                 "url": "https://github.com/php-cache/integration-tests.git",
-                "reference": "a8d9538a44ed5a70d551f9b87f534c98dfe6b0ee"
+                "reference": "eda2e6b8bc5abcd623c8047e2345cda38dd6479e"
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-                "reference": "a8d9538a44ed5a70d551f9b87f534c98dfe6b0ee",
+                "url": "https://api.github.com/repos/php-cache/integration-tests/zipball/eda2e6b8bc5abcd623c8047e2345cda38dd6479e",
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-                "php": "^5.4|^7",
+                "php": ">=5.5.9",
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+            "conflict": {
+                "phpunit/phpunit": "<4.8.35|<5.4.3,>=5.0"
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-                "illuminate/cache": "^5.0",
-                "madewithlove/illuminate-psr-cache-bridge": "^1.0",
-                "phpunit/phpunit": "^4.0|^5.0",
-                "symfony/cache": "^3.1",
-                "tedivm/stash": "dev-master"
+                "cache/cache": "^1.0",
+                "illuminate/cache": "^5.4|^5.5|^5.6",
+                "mockery/mockery": "^1.0",
+                "symfony/cache": "^3.4.31|^4.3.4|^5.0",
+                "symfony/phpunit-bridge": "^5.1",
+                "tedivm/stash": "^0.14"
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@@ -53,7 +56,7 @@
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                     "email": "tobias.nyholm@gmail.com",
-                    "homepage": "https://github.com/Nyholm"
+                    "homepage": "https://github.com/nyholm"
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             "description": "Integration tests for PSR-6 and PSR-16 cache implementations",
@@ -66,9 +69,9 @@
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-                "source": "https://github.com/php-cache/integration-tests/tree/master"
+                "source": "https://github.com/php-cache/integration-tests/tree/0.17.0"
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-            "time": "2017-02-02T14:29:50+00:00"
+            "time": "2020-11-03T12:52:23+00:00"
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@@ -999,29 +1002,31 @@
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-            "version": "1.0.2",
+            "version": "1.1.1",
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                 "url": "https://github.com/laminas/laminas-cache-storage-adapter-test.git",
-                "reference": "4896c384cce35c49e514cc55f40364b08886c65f"
+                "reference": "2a1f1606fbb57f4641aab5c93eb161606eafc4aa"
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-                "reference": "4896c384cce35c49e514cc55f40364b08886c65f",
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+                "reference": "2a1f1606fbb57f4641aab5c93eb161606eafc4aa",
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-                "php": "^5.6 || ^7.0",
-                "phpunit/phpunit": "^5.7.27 || ^6.5.8 || ^7.1.2"
+                "cache/integration-tests": "^0.17",
+                "php": "^7.3 || ~8.0.0",
+                "phpunit/phpunit": "^9.5"
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             },
             "require-dev": {
                 "laminas/laminas-cache": "^2.10",
-                "squizlabs/php_codesniffer": "^3.5"
+                "laminas/laminas-coding-standard": "^2.1",
+                "psalm/plugin-phpunit": "^0.15.1",
+                "vimeo/psalm": "^4.7"
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@@ -1055,7 +1060,7 @@
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                 }
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-            "time": "2021-02-25T09:08:16+00:00"
+            "time": "2021-04-25T00:11:30+00:00"
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@@ -1614,30 +1619,87 @@
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             "time": "2020-11-13T09:40:50+00:00"
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+        {
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+            "version": "v4.12.0",
+            "source": {
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+                "url": "https://github.com/nikic/PHP-Parser.git",
+                "reference": "6608f01670c3cc5079e18c1dab1104e002579143"
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+                "shasum": ""
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+            "require": {
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+                "php": ">=7.0"
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+            "require-dev": {
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+                "phpunit/phpunit": "^6.5 || ^7.0 || ^8.0 || ^9.0"
+            },
+            "bin": [
+                "bin/php-parse"
+            ],
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "4.9-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "PhpParser\\": "lib/PhpParser"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Nikita Popov"
+                }
+            ],
+            "description": "A PHP parser written in PHP",
+            "keywords": [
+                "parser",
+                "php"
+            ],
+            "support": {
+                "issues": "https://github.com/nikic/PHP-Parser/issues",
+                "source": "https://github.com/nikic/PHP-Parser/tree/v4.12.0"
+            },
+            "time": "2021-07-21T10:44:31+00:00"
+        },
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-            "version": "1.0.3",
+            "version": "2.0.3",
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                 "url": "https://github.com/phar-io/manifest.git",
-                "reference": "7761fcacf03b4d4f16e7ccb606d4879ca431fcf4"
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-                "reference": "7761fcacf03b4d4f16e7ccb606d4879ca431fcf4",
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+                "reference": "97803eca37d319dfa7826cc2437fc020857acb53",
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                 "ext-phar": "*",
-                "phar-io/version": "^2.0",
-                "php": "^5.6 || ^7.0"
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+                "php": "^7.2 || ^8.0"
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@@ -1669,26 +1731,26 @@
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-                "source": "https://github.com/phar-io/manifest/tree/master"
+                "source": "https://github.com/phar-io/manifest/tree/2.0.3"
             },
-            "time": "2018-07-08T19:23:20+00:00"
+            "time": "2021-07-20T11:28:43+00:00"
         },
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-            "version": "2.0.1",
+            "version": "3.1.0",
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                 "url": "https://github.com/phar-io/version.git",
-                "reference": "45a2ec53a73c70ce41d55cedef9063630abaf1b6"
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-                "reference": "45a2ec53a73c70ce41d55cedef9063630abaf1b6",
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+                "reference": "bae7c545bef187884426f042434e561ab1ddb182",
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-                "php": "^5.6 || ^7.0"
+                "php": "^7.2 || ^8.0"
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@@ -1720,9 +1782,9 @@
             "description": "Library for handling version information and constraints",
             "support": {
                 "issues": "https://github.com/phar-io/version/issues",
-                "source": "https://github.com/phar-io/version/tree/master"
+                "source": "https://github.com/phar-io/version/tree/3.1.0"
             },
-            "time": "2018-07-08T19:19:57+00:00"
+            "time": "2021-02-23T14:00:09+00:00"
         },
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@@ -1951,40 +2013,44 @@
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-            "version": "6.1.4",
+            "version": "9.2.6",
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-                "reference": "807e6013b00af69b6c5d9ceb4282d0393dbb9d8d"
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-                "reference": "807e6013b00af69b6c5d9ceb4282d0393dbb9d8d",
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+                "reference": "f6293e1b30a2354e8428e004689671b83871edde",
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+                "ext-libxml": "*",
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-                "phpunit/php-file-iterator": "^2.0",
-                "phpunit/php-text-template": "^1.2.1",
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-                "sebastian/environment": "^3.1 || ^4.0",
-                "sebastian/version": "^2.0.1",
-                "theseer/tokenizer": "^1.1"
+                "nikic/php-parser": "^4.10.2",
+                "php": ">=7.3",
+                "phpunit/php-file-iterator": "^3.0.3",
+                "phpunit/php-text-template": "^2.0.2",
+                "sebastian/code-unit-reverse-lookup": "^2.0.2",
+                "sebastian/complexity": "^2.0",
+                "sebastian/environment": "^5.1.2",
+                "sebastian/lines-of-code": "^1.0.3",
+                "sebastian/version": "^3.0.1",
+                "theseer/tokenizer": "^1.2.0"
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             "require-dev": {
-                "phpunit/phpunit": "^7.0"
+                "phpunit/phpunit": "^9.3"
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             "suggest": {
-                "ext-xdebug": "^2.6.0"
+                "ext-pcov": "*",
+                "ext-xdebug": "*"
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+                    "dev-master": "9.2-dev"
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@@ -2012,34 +2078,40 @@
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-                "source": "https://github.com/sebastianbergmann/php-code-coverage/tree/master"
+                "source": "https://github.com/sebastianbergmann/php-code-coverage/tree/9.2.6"
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-            "time": "2018-10-31T16:06:48+00:00"
+            "funding": [
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+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2021-03-28T07:26:59+00:00"
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-            "version": "2.0.3",
+            "version": "3.0.5",
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-                "reference": "4b49fb70f067272b659ef0174ff9ca40fdaa6357"
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-                "reference": "4b49fb70f067272b659ef0174ff9ca40fdaa6357",
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+                "reference": "aa4be8575f26070b100fccb67faabb28f21f66f8",
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-                "php": ">=7.1"
+                "php": ">=7.3"
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+                "phpunit/phpunit": "^9.3"
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-                    "dev-master": "2.0.x-dev"
+                    "dev-master": "3.0-dev"
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@@ -2066,7 +2138,7 @@
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                 "issues": "https://github.com/sebastianbergmann/php-file-iterator/issues",
-                "source": "https://github.com/sebastianbergmann/php-file-iterator/tree/2.0.3"
+                "source": "https://github.com/sebastianbergmann/php-file-iterator/tree/3.0.5"
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@@ -2074,26 +2146,38 @@
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-            "time": "2020-11-30T08:25:21+00:00"
+            "time": "2020-09-28T05:57:25+00:00"
         },
         {
-            "name": "phpunit/php-text-template",
-            "version": "1.2.1",
+            "name": "phpunit/php-invoker",
+            "version": "3.1.1",
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-                "url": "https://github.com/sebastianbergmann/php-text-template.git",
-                "reference": "31f8b717e51d9a2afca6c9f046f5d69fc27c8686"
+                "url": "https://github.com/sebastianbergmann/php-invoker.git",
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-                "reference": "31f8b717e51d9a2afca6c9f046f5d69fc27c8686",
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+                "php": ">=7.3"
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+                }
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@@ -2110,41 +2194,47 @@
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-            "description": "Simple template engine.",
-            "homepage": "https://github.com/sebastianbergmann/php-text-template/",
+            "description": "Invoke callables with a timeout",
+            "homepage": "https://github.com/sebastianbergmann/php-invoker/",
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-                "template"
+                "process"
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-                "issues": "https://github.com/sebastianbergmann/php-text-template/issues",
-                "source": "https://github.com/sebastianbergmann/php-text-template/tree/1.2.1"
+                "issues": "https://github.com/sebastianbergmann/php-invoker/issues",
+                "source": "https://github.com/sebastianbergmann/php-invoker/tree/3.1.1"
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-            "time": "2015-06-21T13:50:34+00:00"
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2020-09-28T05:58:55+00:00"
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-            "name": "phpunit/php-timer",
-            "version": "2.1.3",
+            "name": "phpunit/php-text-template",
+            "version": "2.0.4",
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-                "url": "https://github.com/sebastianbergmann/php-timer.git",
-                "reference": "2454ae1765516d20c4ffe103d85a58a9a3bd5662"
+                "url": "https://github.com/sebastianbergmann/php-text-template.git",
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-                "reference": "2454ae1765516d20c4ffe103d85a58a9a3bd5662",
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+                "php": ">=7.3"
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+                    "dev-master": "2.0-dev"
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@@ -2163,14 +2253,14 @@
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                 }
             ],
-            "description": "Utility class for timing",
-            "homepage": "https://github.com/sebastianbergmann/php-timer/",
+            "description": "Simple template engine.",
+            "homepage": "https://github.com/sebastianbergmann/php-text-template/",
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-                "timer"
+                "template"
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-                "issues": "https://github.com/sebastianbergmann/php-timer/issues",
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             ],
-            "time": "2020-07-12T23:59:07+00:00"
+            "time": "2021-07-28T10:34:58+00:00"
         },
         {
             "name": "webmozart/assert",
@@ -3417,8 +3821,8 @@
     "prefer-stable": false,
     "prefer-lowest": false,
     "platform": {
-        "php": "^7.3"
+        "php": "^7.3 || ~8.0.0"
     },
     "platform-dev": [],
-    "plugin-api-version": "2.0.0"
+    "plugin-api-version": "2.1.0"
 }
diff --git a/phpunit.xml.dist b/phpunit.xml.dist
index 7f395e0..13b51df 100644
--- a/phpunit.xml.dist
+++ b/phpunit.xml.dist
@@ -1,21 +1,17 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-         xsi:noNamespaceSchemaLocation="vendor/phpunit/phpunit/phpunit.xsd"
-         bootstrap="vendor/autoload.php"
-         colors="true">
-    <testsuites>
-        <testsuite name="Laminas cache-storage-adapter-memcached Tests">
-            <directory>./test</directory>
-        </testsuite>
-    </testsuites>
-
-    <filter>
-        <whitelist processUncoveredFilesFromWhitelist="true">
-            <directory suffix=".php">./src</directory>
-        </whitelist>
-    </filter>
-    <php>
-        <env name="TESTS_LAMINAS_CACHE_MEMCACHED_HOST" value="127.0.0.1" />
-        <env name="TESTS_LAMINAS_CACHE_MEMCACHED_PORT" value="11211" />
-    </php>
+<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/9.3/phpunit.xsd" bootstrap="vendor/autoload.php" colors="true">
+  <coverage processUncoveredFiles="true">
+    <include>
+      <directory suffix=".php">./src</directory>
+    </include>
+  </coverage>
+  <testsuites>
+    <testsuite name="Laminas cache-storage-adapter-memcached Tests">
+      <directory>./test</directory>
+    </testsuite>
+  </testsuites>
+  <php>
+    <env name="TESTS_LAMINAS_CACHE_MEMCACHED_HOST" value="127.0.0.1"/>
+    <env name="TESTS_LAMINAS_CACHE_MEMCACHED_PORT" value="11211"/>
+  </php>
 </phpunit>
diff --git a/test/integration/Psr/CacheItemPool/MemcachedIntegrationTest.php b/test/integration/Psr/CacheItemPool/MemcachedIntegrationTest.php
index e39a16d..480300e 100644
--- a/test/integration/Psr/CacheItemPool/MemcachedIntegrationTest.php
+++ b/test/integration/Psr/CacheItemPool/MemcachedIntegrationTest.php
@@ -25,16 +25,17 @@ class MemcachedIntegrationTest extends CachePoolTest
      */
     private $storage;
 
-    protected function setUp()
+    protected function setUp(): void
     {
         // set non-UTC timezone
         $this->tz = date_default_timezone_get();
         date_default_timezone_set('America/Vancouver');
 
+        $this->skippedTests['testBasicUsageWithLongKey'] = 'Memcached adapter does not support keys up to 300 bytes.';
         parent::setUp();
     }
 
-    protected function tearDown()
+    protected function tearDown(): void
     {
         date_default_timezone_set($this->tz);
 
diff --git a/test/integration/Psr/SimpleCache/MemcachedIntegrationTest.php b/test/integration/Psr/SimpleCache/MemcachedIntegrationTest.php
index 7d13558..4f15e20 100644
--- a/test/integration/Psr/SimpleCache/MemcachedIntegrationTest.php
+++ b/test/integration/Psr/SimpleCache/MemcachedIntegrationTest.php
@@ -25,16 +25,17 @@ class MemcachedIntegrationTest extends SimpleCacheTest
      */
     private $storage;
 
-    protected function setUp()
+    protected function setUp(): void
     {
         // set non-UTC timezone
         $this->tz = date_default_timezone_get();
         date_default_timezone_set('America/Vancouver');
+        $this->skippedTests['testBasicUsageWithLongKey'] = 'Memcached adapter does not support keys up to 300 bytes.';
 
         parent::setUp();
     }
 
-    protected function tearDown()
+    protected function tearDown(): void
     {
         date_default_timezone_set($this->tz);
 
diff --git a/test/unit/MemcachedResourceManagerTest.php b/test/unit/MemcachedResourceManagerTest.php
index 5592ad3..bbbecd1 100644
--- a/test/unit/MemcachedResourceManagerTest.php
+++ b/test/unit/MemcachedResourceManagerTest.php
@@ -22,7 +22,7 @@ class MemcachedResourceManagerTest extends TestCase
      */
     protected $resourceManager;
 
-    public function setUp()
+    public function setUp(): void
     {
         $this->resourceManager = new MemcachedResourceManager();
     }
diff --git a/test/unit/MemcachedTest.php b/test/unit/MemcachedTest.php
index 7fb1d29..e54d50b 100644
--- a/test/unit/MemcachedTest.php
+++ b/test/unit/MemcachedTest.php
@@ -3,6 +3,7 @@
 namespace LaminasTest\Cache\Storage\Adapter;
 
 use Laminas\Cache;
+use Memcached;
 use Prophecy\Argument;
 use RuntimeException;
 use stdClass;
@@ -15,7 +16,7 @@
  */
 class MemcachedTest extends CommonAdapterTest
 {
-    public function setUp()
+    public function setUp(): void
     {
         if (! extension_loaded('memcached')) {
             $this->markTestSkipped("Memcached extension is not loaded");
@@ -87,28 +88,40 @@ public function testMemcachedReturnsSuccessFalseOnError()
             return;
         }
 
-        $resource = $this->prophesize(\Memcached::class);
-        $resourceManager = $this->prophesize(Cache\Storage\Adapter\MemcachedResourceManager::class);
+        $resource = $this->createMock(\Memcached::class);
+        $resourceManager = $this->createMock(Cache\Storage\Adapter\MemcachedResourceManager::class);
+
+        $resourceManager
+            ->method('getResource')
+            ->willReturn($resource);
+
+        $resource
+            ->method('get')
+            ->willReturn(null);
 
-        $resourceManager->getResource(Argument::any())->willReturn($resource->reveal());
-        $resource->get(Argument::cetera())->willReturn(null);
-        $resource->getResultCode()->willReturn(\Memcached::RES_PARTIAL_READ);
-        $resource->getResultMessage()->willReturn('foo');
+        $resource
+            ->method('getResultCode')
+            ->willReturn(\Memcached::RES_PARTIAL_READ);
+
+        $resource
+            ->method('getResultMessage')
+            ->willReturn('foo');
 
         $storage = new Cache\Storage\Adapter\Memcached([
-            'resource_manager' => $resourceManager->reveal(),
+            'resource_manager' => $resourceManager,
         ]);
 
-        $storage->getEventManager()->attach(
-            'getItem.exception',
-            function (Cache\Storage\ExceptionEvent $e) {
-                $e->setThrowException(false);
-                $e->stopPropagation(true);
-            },
-            -1
-        );
-
-        $this->assertNull($storage->getItem('unknwon', $success, $casToken));
+        $storage
+            ->getEventManager()->attach(
+                'getItem.exception',
+                function (Cache\Storage\ExceptionEvent $e) {
+                    $e->setThrowException(false);
+                    $e->stopPropagation(true);
+                },
+                -1
+            );
+
+        $this->assertNull($storage->getItem('unknown', $success, $casToken));
         $this->assertFalse($success);
         $this->assertNull($casToken);
     }
@@ -246,7 +259,11 @@ public function createExceptionWithCode(int $code): Throwable
 
     public function testExceptionCodeIsPassedToRuntimeExceptionWhenTotalSpaceRequestFails(): void
     {
-        $memcached = $this->createPartialMock(stdClass::class, ['getStats', 'getResultMessage', 'getResultCode']);
+        $memcached = $this
+            ->getMockBuilder(Memcached::class)
+            ->onlyMethods(['getStats', 'getResultMessage', 'getResultCode'])
+            ->getMock();
+
         $memcached->method('getStats')->willReturn(false);
         $memcached->method('getResultMessage')->willReturn('Bar');
         $code = random_int(1, 999);
@@ -269,7 +286,11 @@ public function testExceptionCodeIsPassedToRuntimeExceptionWhenTotalSpaceRequest
 
     public function testExceptionCodeIsPassedToRuntimeExceptionWhenAvailableSpaceRequestFails(): void
     {
-        $memcached = $this->createPartialMock(stdClass::class, ['getStats', 'getResultMessage', 'getResultCode']);
+        $memcached = $this
+            ->getMockBuilder(Memcached::class)
+            ->onlyMethods(['getStats', 'getResultMessage', 'getResultCode'])
+            ->getMock();
+
         $memcached->method('getStats')->willReturn(false);
         $memcached->method('getResultMessage')->willReturn('Foo');
         $code = random_int(1, 999);
@@ -290,7 +311,7 @@ public function testExceptionCodeIsPassedToRuntimeExceptionWhenAvailableSpaceReq
         $storage->getAvailableSpace();
     }
 
-    public function tearDown()
+    public function tearDown(): void
     {
         if ($this->_storage) {
             $this->_storage->flush();