diff --git a/Neos.Flow/Classes/Command/CacheCommandController.php b/Neos.Flow/Classes/Command/CacheCommandController.php
index 2f79738aa2..414e3724ec 100644
--- a/Neos.Flow/Classes/Command/CacheCommandController.php
+++ b/Neos.Flow/Classes/Command/CacheCommandController.php
@@ -137,8 +137,6 @@ public function injectEnvironment(Environment $environment)
      * @param boolean $force Force flushing of any temporary data
      * @return void
      * @see neos.flow:cache:warmup
-     * @see neos.flow:package:freeze
-     * @see neos.flow:package:refreeze
      */
     public function flushCommand(bool $force = false)
     {
diff --git a/Neos.Flow/Classes/Command/PackageCommandController.php b/Neos.Flow/Classes/Command/PackageCommandController.php
index 79649b5d0c..f29fd399f3 100644
--- a/Neos.Flow/Classes/Command/PackageCommandController.php
+++ b/Neos.Flow/Classes/Command/PackageCommandController.php
@@ -103,76 +103,6 @@ public function listCommand(bool $loadingOrder = false)
         }
     }
 
-    /**
-     * Freeze a package
-     *
-     * This function marks a package as <b>frozen</b> in order to improve performance
-     * in a development context. While a package is frozen, any modification of files
-     * within that package won't be tracked and can lead to unexpected behavior.
-     *
-     * File monitoring won't consider the given package. Further more, reflection
-     * data for classes contained in the package is cached persistently and loaded
-     * directly on the first request after caches have been flushed. The precompiled
-     * reflection data is stored in the <b>Configuration</b> directory of the
-     * respective package.
-     *
-     * By specifying <b>all</b> as a package key, all currently frozen packages are
-     * frozen (the default).
-     *
-     * @param string $packageKey Key of the package to freeze
-     * @return void
-     * @see neos.flow:package:unfreeze
-     * @see neos.flow:package:refreeze
-     * @deprecated since 8.4
-     */
-    public function freezeCommand(string $packageKey = 'all')
-    {
-        $this->outputLine('Package freezing is no longer supported, this command is deprecated and will be removed with 9.0.');
-    }
-
-    /**
-     * Unfreeze a package
-     *
-     * Unfreezes a previously frozen package. On the next request, this package will
-     * be considered again by the file monitoring and related services – if they are
-     * enabled in the current context.
-     *
-     * By specifying <b>all</b> as a package key, all currently frozen packages are
-     * unfrozen (the default).
-     *
-     * @param string $packageKey Key of the package to unfreeze, or 'all'
-     * @return void
-     * @see neos.flow:package:freeze
-     * @see neos.flow:cache:flush
-     * @deprecated since 8.4
-     */
-    public function unfreezeCommand(string $packageKey = 'all')
-    {
-        $this->outputLine('Package freezing is no longer supported, this command is deprecated and will be removed with 9.0.');
-    }
-
-    /**
-     * Refreeze a package
-     *
-     * Refreezes a currently frozen package: all precompiled information is removed
-     * and file monitoring will consider the package exactly once, on the next
-     * request. After that request, the package remains frozen again, just with the
-     * updated data.
-     *
-     * By specifying <b>all</b> as a package key, all currently frozen packages are
-     * refrozen (the default).
-     *
-     * @param string $packageKey Key of the package to refreeze, or 'all'
-     * @return void
-     * @see neos.flow:package:freeze
-     * @see neos.flow:cache:flush
-     * @deprecated since 8.4
-     */
-    public function refreezeCommand(string $packageKey = 'all')
-    {
-        $this->outputLine('Package freezing is no longer supported, this command is deprecated and will be removed with 9.0.');
-    }
-
     /**
      * Rescan package availability and recreates the PackageStates configuration.
      */
diff --git a/Neos.Flow/Classes/Package/PackageManager.php b/Neos.Flow/Classes/Package/PackageManager.php
index 8b0e8e9432..d2b0522118 100644
--- a/Neos.Flow/Classes/Package/PackageManager.php
+++ b/Neos.Flow/Classes/Package/PackageManager.php
@@ -222,19 +222,6 @@ public function getAvailablePackages(): array
         return $this->packages;
     }
 
-    /**
-     * Returns an array of PackageInterface objects of all frozen packages.
-     * A frozen package is not considered by file monitoring and provides some
-     * precompiled reflection data in order to improve performance.
-     *
-     * @return array<PackageInterface>
-     * @deprecated since 8.4
-     */
-    public function getFrozenPackages(): array
-    {
-        return [];
-    }
-
     /**
      * Returns an array of PackageInterface objects of all packages that match
      * the given package state, path, and type filters. All three filters must match, if given.
@@ -253,8 +240,7 @@ public function getFilteredPackages($packageState = 'available', $packageType =
                 $packages = $this->getAvailablePackages();
                 break;
             case 'frozen':
-                $packages = $this->getFrozenPackages();
-                break;
+                throw new Exception\InvalidPackageStateException('The package state "frozen" is has been removed', 1739462316);
             default:
                 throw new Exception\InvalidPackageStateException('The package state "' . $packageState . '" is invalid', 1372458274);
         }
@@ -382,34 +368,6 @@ public function createPackage($packageKey, array $manifest = [], $packagesPath =
         return $package;
     }
 
-    /**
-     * Moves a package from one path to another.
-     *
-     * @param string $fromAbsolutePath
-     * @param string $toAbsolutePath
-     * @return void
-     * @throws FilesException
-     * @deprecated since 8.4
-     */
-    protected function movePackage($fromAbsolutePath, $toAbsolutePath): void
-    {
-        Files::createDirectoryRecursively($toAbsolutePath);
-        Files::copyDirectoryRecursively($fromAbsolutePath, $toAbsolutePath, false, true);
-        Files::removeDirectoryRecursively($fromAbsolutePath);
-    }
-
-    /**
-     * Tells if a package is frozen
-     *
-     * @param string $packageKey The package to check
-     * @return boolean
-     * @deprecated since 8.4
-     */
-    public function isPackageFrozen($packageKey): bool
-    {
-        return false;
-    }
-
     /**
      * Rescans available packages, order and write a new PackageStates file.
      *
diff --git a/Neos.Flow/Configuration/Caches.yaml b/Neos.Flow/Configuration/Caches.yaml
index dacf32662f..480163797f 100644
--- a/Neos.Flow/Configuration/Caches.yaml
+++ b/Neos.Flow/Configuration/Caches.yaml
@@ -95,16 +95,6 @@ Flow_Persistence_Doctrine_Results:
 Flow_Persistence_Doctrine_SecondLevel:
   backend: Neos\Cache\Backend\SimpleFileBackend
 
-#
-# DEPRECATED since 8.4
-# These caches will be removed in 9.0, they are unused so you can safely remove any configuration for them.
-#
-Flow_Reflection_Status:
-  frontend: Neos\Cache\Frontend\StringFrontend
-  backend: Neos\Cache\Backend\SimpleFileBackend
-Flow_Reflection_CompiletimeData:
-  backend: Neos\Cache\Backend\SimpleFileBackend
-
 # Flow_Reflection
 #
 #