diff --git a/composer.json b/composer.json
index 1505ac4..e009203 100644
--- a/composer.json
+++ b/composer.json
@@ -6,7 +6,7 @@
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-        "brick/money": "0.8.*"
+        "brick/money": "^0.9.0"
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diff --git a/composer.lock b/composer.lock
index 9229263..5fc8ea8 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,29 +4,29 @@
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+    "content-hash": "f1d87500b1035169f65f9bfb952788d2",
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-                "reference": "0ad82ce168c82ba30d1c01ec86116ab52f589478"
+                "reference": "f510c0a40911935b77b86859eb5223d58d660df1"
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-                "reference": "0ad82ce168c82ba30d1c01ec86116ab52f589478",
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-                "phpunit/phpunit": "^9.0",
-                "vimeo/psalm": "5.0.0"
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@@ -46,12 +46,17 @@
                 "arithmetic",
                 "bigdecimal",
                 "bignum",
+                "bignumber",
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-                "math"
+                "decimal",
+                "integer",
+                "math",
+                "mathematics",
+                "rational"
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-                "source": "https://github.com/brick/math/tree/0.11.0"
+                "source": "https://github.com/brick/math/tree/0.12.1"
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@@ -59,34 +64,34 @@
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+            "time": "2023-11-29T23:19:16+00:00"
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+            "version": "0.9.0",
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                 "url": "https://github.com/brick/money.git",
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@@ -109,7 +114,7 @@
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-                "source": "https://github.com/brick/money/tree/0.8.1"
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@@ -117,7 +122,7 @@
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@@ -324,16 +329,16 @@
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@@ -344,7 +349,7 @@
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-                "phpunit/phpunit": "^7.0 || ^8.0 || ^9.0"
+                "phpunit/phpunit": "^9.0"
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@@ -376,9 +381,9 @@
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-                "source": "https://github.com/nikic/PHP-Parser/tree/v5.0.2"
+                "source": "https://github.com/nikic/PHP-Parser/tree/v5.1.0"
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@@ -753,35 +758,35 @@
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-                "reference": "48c34b5d8d983006bd2adc2d0de92963b9155965",
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@@ -790,7 +795,7 @@
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@@ -819,7 +824,7 @@
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@@ -827,7 +832,7 @@
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-            "time": "2024-03-02T06:37:42+00:00"
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@@ -1072,45 +1077,45 @@
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@@ -1155,7 +1160,7 @@
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@@ -1171,7 +1176,7 @@
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@@ -1228,16 +1233,16 @@
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@@ -1272,9 +1277,9 @@
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@@ -2241,16 +2246,16 @@
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@@ -2315,7 +2320,7 @@
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@@ -2331,7 +2336,7 @@
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@@ -2402,20 +2407,20 @@
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@@ -2461,7 +2466,7 @@
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@@ -2477,24 +2482,24 @@
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@@ -2539,7 +2544,7 @@
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@@ -2555,24 +2560,24 @@
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@@ -2620,7 +2625,7 @@
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             "support": {
-                "source": "https://github.com/symfony/polyfill-intl-normalizer/tree/v1.30.0"
+                "source": "https://github.com/symfony/polyfill-intl-normalizer/tree/v1.31.0"
             },
             "funding": [
                 {
@@ -2636,24 +2641,24 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2024-05-31T15:07:36+00:00"
+            "time": "2024-09-09T11:45:10+00:00"
         },
         {
             "name": "symfony/polyfill-mbstring",
-            "version": "v1.30.0",
+            "version": "v1.31.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/polyfill-mbstring.git",
-                "reference": "fd22ab50000ef01661e2a31d850ebaa297f8e03c"
+                "reference": "85181ba99b2345b0ef10ce42ecac37612d9fd341"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/polyfill-mbstring/zipball/fd22ab50000ef01661e2a31d850ebaa297f8e03c",
-                "reference": "fd22ab50000ef01661e2a31d850ebaa297f8e03c",
+                "url": "https://api.github.com/repos/symfony/polyfill-mbstring/zipball/85181ba99b2345b0ef10ce42ecac37612d9fd341",
+                "reference": "85181ba99b2345b0ef10ce42ecac37612d9fd341",
                 "shasum": ""
             },
             "require": {
-                "php": ">=7.1"
+                "php": ">=7.2"
             },
             "provide": {
                 "ext-mbstring": "*"
@@ -2700,7 +2705,7 @@
                 "shim"
             ],
             "support": {
-                "source": "https://github.com/symfony/polyfill-mbstring/tree/v1.30.0"
+                "source": "https://github.com/symfony/polyfill-mbstring/tree/v1.31.0"
             },
             "funding": [
                 {
@@ -2716,7 +2721,7 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2024-06-19T12:30:46+00:00"
+            "time": "2024-09-09T11:45:10+00:00"
         },
         {
             "name": "symfony/service-contracts",
@@ -2803,16 +2808,16 @@
         },
         {
             "name": "symfony/string",
-            "version": "v7.1.1",
+            "version": "v7.1.4",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/string.git",
-                "reference": "60bc311c74e0af215101235aa6f471bcbc032df2"
+                "reference": "6cd670a6d968eaeb1c77c2e76091c45c56bc367b"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/string/zipball/60bc311c74e0af215101235aa6f471bcbc032df2",
-                "reference": "60bc311c74e0af215101235aa6f471bcbc032df2",
+                "url": "https://api.github.com/repos/symfony/string/zipball/6cd670a6d968eaeb1c77c2e76091c45c56bc367b",
+                "reference": "6cd670a6d968eaeb1c77c2e76091c45c56bc367b",
                 "shasum": ""
             },
             "require": {
@@ -2870,7 +2875,7 @@
                 "utf8"
             ],
             "support": {
-                "source": "https://github.com/symfony/string/tree/v7.1.1"
+                "source": "https://github.com/symfony/string/tree/v7.1.4"
             },
             "funding": [
                 {
@@ -2886,7 +2891,7 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2024-06-04T06:40:14+00:00"
+            "time": "2024-08-12T09:59:40+00:00"
         },
         {
             "name": "theseer/tokenizer",
diff --git a/src/Calculator.php b/src/Calculator.php
index 75c9c8e..b58fda7 100644
--- a/src/Calculator.php
+++ b/src/Calculator.php
@@ -3,7 +3,7 @@
 namespace Whitecube\Price;
 
 use Brick\Money\Money;
-use Brick\Money\AbstractMoney;
+use Brick\Money\RationalMoney;
 use Whitecube\Price\Price;
 
 class Calculator
@@ -38,7 +38,7 @@ public function exclusiveBeforeVat(bool $perUnit): array
     /**
      * Return the result for the "VAT" Money build
      */
-    public function vat(bool $perUnit): array|AbstractMoney
+    public function vat(bool $perUnit): array|RationalMoney
     {
         return $this->getCached('vat', $perUnit)
             ?? $this->setCached('vat', $perUnit, $this->getVatResult($perUnit));
@@ -65,7 +65,7 @@ public function inclusive(bool $perUnit): array
     /**
      * Retrieve a cached value for key and unit mode
      */
-    protected function getCached(string $key, bool $perUnit): null|array|AbstractMoney
+    protected function getCached(string $key, bool $perUnit): null|array|RationalMoney
     {
         return $this->cache[$key][$perUnit ? 'unit' : 'all'] ?? null;
     }
@@ -73,7 +73,7 @@ protected function getCached(string $key, bool $perUnit): null|array|AbstractMon
     /**
      * Set a cached value for key and unit mode
      */
-    protected function setCached(string $key, bool $perUnit, array|AbstractMoney $result): array|AbstractMoney
+    protected function setCached(string $key, bool $perUnit, array|RationalMoney $result): array|RationalMoney
     {
         $this->cache[$key][$perUnit ? 'unit' : 'all'] = $result;
 
@@ -123,12 +123,12 @@ protected function getExclusiveAfterVatResult(bool $perUnit): array
     /**
      * Compute the VAT
      */
-    protected function getVatResult(bool $perUnit): AbstractMoney
+    protected function getVatResult(bool $perUnit): RationalMoney
     {
         $vat = $this->price->vat(true);
 
         if(! $vat) {
-            return Money::zero($this->price->currency(), $this->price->context());
+            return Money::zero($this->price->currency(), $this->price->context())->toRational();
         }
 
         $exclusive = $this->exclusiveBeforeVat($perUnit)['amount'];
@@ -156,7 +156,7 @@ protected function getInclusiveResult(bool $perUnit): array
     /**
      * Compute the price for one unit before VAT is applied
      */
-    protected function applyModifier(PriceAmendable $modifier, array $result, bool $perUnit, bool $postVat = false, AbstractMoney $exclusive = null, Vat $vat = null): array
+    protected function applyModifier(PriceAmendable $modifier, array $result, bool $perUnit, bool $postVat = false, RationalMoney $exclusive = null, Vat $vat = null): array
     {
         $updated = $modifier->apply($result['amount'], $this->price->units(), $perUnit, $exclusive, $vat);
 
diff --git a/src/Price.php b/src/Price.php
index f133f30..06b76a5 100644
--- a/src/Price.php
+++ b/src/Price.php
@@ -24,7 +24,7 @@ class Price implements \JsonSerializable
     /**
      * The default rounding methods that should be applied when calculating prices
      */
-    static protected ?int $defaultRoundingMode = null;
+    static protected ?RoundingMode $defaultRoundingMode = null;
 
     /**
      * The default Money context that should be applied transforming Rational monies