diff --git a/packages/core/fraction.mjs b/packages/core/fraction.mjs
index 92ba5156..3af73e0e 100644
--- a/packages/core/fraction.mjs
+++ b/packages/core/fraction.mjs
@@ -4,7 +4,7 @@ Copyright (C) 2022 Strudel contributors - see <https://github.com/tidalcycles/st
 This program is free software: you can redistribute it and/or modify it under the terms of the GNU Affero General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Affero General Public License for more details. You should have received a copy of the GNU Affero General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */
 
-import { Fraction } from 'fraction.js';
+import Fraction from 'fraction.js';
 import { TimeSpan } from './timespan.mjs';
 
 // Returns the start of the cycle.
diff --git a/packages/core/test/pattern.test.mjs b/packages/core/test/pattern.test.mjs
index 93dba47d..31b080b6 100644
--- a/packages/core/test/pattern.test.mjs
+++ b/packages/core/test/pattern.test.mjs
@@ -4,7 +4,7 @@ Copyright (C) 2022 Strudel contributors - see <https://github.com/tidalcycles/st
 This program is free software: you can redistribute it and/or modify it under the terms of the GNU Affero General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Affero General Public License for more details. You should have received a copy of the GNU Affero General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */
 
-import { Fraction } from 'fraction.js';
+import Fraction from 'fraction.js';
 
 import { describe, it, expect } from 'vitest';
 
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index e36c33f0..9fbc35d7 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -271,6 +271,7 @@ importers:
       '@types/react': ^18.0.26
       '@types/react-dom': ^18.0.9
       astro: ^1.7.2
+      fraction.js: ^4.2.0
       html-escaper: ^3.0.3
       nanoid: ^4.0.0
       preact: ^10.7.3
@@ -308,6 +309,7 @@ importers:
       '@types/react': 18.0.27
       '@types/react-dom': 18.0.10
       astro: 1.9.2_@types+node@18.11.18
+      fraction.js: 4.2.0
       nanoid: 4.0.0
       preact: 10.11.3
       react: 18.2.0
@@ -8834,17 +8836,6 @@ packages:
       - supports-color
     dev: true
 
-  /postcss-import/14.1.0:
-    resolution: {integrity: sha512-flwI+Vgm4SElObFVPpTIT7SU7R3qk2L7PyduMcokiaVKuWv9d/U+Gm/QAd8NDLuykTWTkcrjOeD2Pp1rMeBTGw==}
-    engines: {node: '>=10.0.0'}
-    peerDependencies:
-      postcss: ^8.0.0
-    dependencies:
-      postcss-value-parser: 4.2.0
-      read-cache: 1.0.0
-      resolve: 1.22.1
-    dev: false
-
   /postcss-import/14.1.0_postcss@8.4.21:
     resolution: {integrity: sha512-flwI+Vgm4SElObFVPpTIT7SU7R3qk2L7PyduMcokiaVKuWv9d/U+Gm/QAd8NDLuykTWTkcrjOeD2Pp1rMeBTGw==}
     engines: {node: '>=10.0.0'}
@@ -8855,16 +8846,6 @@ packages:
       postcss-value-parser: 4.2.0
       read-cache: 1.0.0
       resolve: 1.22.1
-    dev: true
-
-  /postcss-js/4.0.0:
-    resolution: {integrity: sha512-77QESFBwgX4irogGVPgQ5s07vLvFqWr228qZY+w6lW599cRlK/HmnlivnnVUxkjHnCu4J16PDMHcH+e+2HbvTQ==}
-    engines: {node: ^12 || ^14 || >= 16}
-    peerDependencies:
-      postcss: ^8.3.3
-    dependencies:
-      camelcase-css: 2.0.1
-    dev: false
 
   /postcss-js/4.0.0_postcss@8.4.21:
     resolution: {integrity: sha512-77QESFBwgX4irogGVPgQ5s07vLvFqWr228qZY+w6lW599cRlK/HmnlivnnVUxkjHnCu4J16PDMHcH+e+2HbvTQ==}
@@ -8874,23 +8855,6 @@ packages:
     dependencies:
       camelcase-css: 2.0.1
       postcss: 8.4.21
-    dev: true
-
-  /postcss-load-config/3.1.4:
-    resolution: {integrity: sha512-6DiM4E7v4coTE4uzA8U//WhtPwyhiim3eyjEMFCnUpzbrkK9wJHgKDT2mR+HbtSrd/NubVaYTOpSpjUl8NQeRg==}
-    engines: {node: '>= 10'}
-    peerDependencies:
-      postcss: '>=8.0.9'
-      ts-node: '>=9.0.0'
-    peerDependenciesMeta:
-      postcss:
-        optional: true
-      ts-node:
-        optional: true
-    dependencies:
-      lilconfig: 2.0.6
-      yaml: 1.10.2
-    dev: false
 
   /postcss-load-config/3.1.4_postcss@8.4.21:
     resolution: {integrity: sha512-6DiM4E7v4coTE4uzA8U//WhtPwyhiim3eyjEMFCnUpzbrkK9wJHgKDT2mR+HbtSrd/NubVaYTOpSpjUl8NQeRg==}
@@ -8908,15 +8872,6 @@ packages:
       postcss: 8.4.21
       yaml: 1.10.2
 
-  /postcss-nested/6.0.0:
-    resolution: {integrity: sha512-0DkamqrPcmkBDsLn+vQDIrtkSbNkv5AD/M322ySo9kqFkCIYklym2xEmWkwo+Y3/qZo34tzEPNUw4y7yMCdv5w==}
-    engines: {node: '>=12.0'}
-    peerDependencies:
-      postcss: ^8.2.14
-    dependencies:
-      postcss-selector-parser: 6.0.11
-    dev: false
-
   /postcss-nested/6.0.0_postcss@8.4.21:
     resolution: {integrity: sha512-0DkamqrPcmkBDsLn+vQDIrtkSbNkv5AD/M322ySo9kqFkCIYklym2xEmWkwo+Y3/qZo34tzEPNUw4y7yMCdv5w==}
     engines: {node: '>=12.0'}
@@ -8925,7 +8880,6 @@ packages:
     dependencies:
       postcss: 8.4.21
       postcss-selector-parser: 6.0.11
-    dev: true
 
   /postcss-selector-parser/6.0.10:
     resolution: {integrity: sha512-IQ7TZdoaqbT+LCpShg46jnZVlhWD2w6iQYAcYXfHARZ7X1t/UGhhceQDs5X0cGqKvYlHNOuv7Oa1xmb0oQuA3w==}
@@ -10431,8 +10385,6 @@ packages:
     resolution: {integrity: sha512-AhwtHCKMtR71JgeYDaswmZXhPcW9iuI9Sp2LvZPo9upDZ7231ZJ7eA9RaURbhpXGVlrjX4cFNlB4ieTetEb7hQ==}
     engines: {node: '>=12.13.0'}
     hasBin: true
-    peerDependencies:
-      postcss: ^8.0.9
     dependencies:
       arg: 5.0.2
       chokidar: 3.5.3
@@ -10449,10 +10401,10 @@ packages:
       object-hash: 3.0.0
       picocolors: 1.0.0
       postcss: 8.4.21
-      postcss-import: 14.1.0
-      postcss-js: 4.0.0
-      postcss-load-config: 3.1.4
-      postcss-nested: 6.0.0
+      postcss-import: 14.1.0_postcss@8.4.21
+      postcss-js: 4.0.0_postcss@8.4.21
+      postcss-load-config: 3.1.4_postcss@8.4.21
+      postcss-nested: 6.0.0_postcss@8.4.21
       postcss-selector-parser: 6.0.11
       postcss-value-parser: 4.2.0
       quick-lru: 5.1.1
diff --git a/website/package.json b/website/package.json
index 83b311d7..b0ba7cd8 100644
--- a/website/package.json
+++ b/website/package.json
@@ -39,6 +39,7 @@
     "@types/react": "^18.0.26",
     "@types/react-dom": "^18.0.9",
     "astro": "^1.7.2",
+    "fraction.js": "^4.2.0",
     "nanoid": "^4.0.0",
     "preact": "^10.7.3",
     "react": "^18.2.0",