diff --git a/.copier-answers.yaml b/.copier-answers.yaml
index d0e0b9a..8f017a7 100644
--- a/.copier-answers.yaml
+++ b/.copier-answers.yaml
@@ -1,5 +1,5 @@
 # Changes here will be overwritten by Copier
-_commit: 9be318c
+_commit: '1246721'
 _src_path: https://github.com/python-project-templates/base.git
 add_docs: true
 add_extension: rustjswasm
diff --git a/.gitattributes b/.gitattributes
index e3e8131..f048eda 100644
--- a/.gitattributes
+++ b/.gitattributes
@@ -7,7 +7,6 @@ Makefile linguist-documentation
 *.html text=auto eol=lf
 *.js text=auto eol=lf
 *.json text=auto eol=lf
-*.less text=auto eol=lf
 *.md text=auto eol=lf
 *.py text=auto eol=lf
 *.rs text=auto eol=lf
diff --git a/.github/workflows/build.yaml b/.github/workflows/build.yaml
index 84b1386..fa3deef 100644
--- a/.github/workflows/build.yaml
+++ b/.github/workflows/build.yaml
@@ -78,7 +78,7 @@ jobs:
       if: matrix.os == 'ubuntu-latest'
 
     - name: Upload coverage
-      uses: codecov/codecov-action@v5
+      uses: codecov/codecov-action@v6
       with:
         token: ${{ secrets.CODECOV_TOKEN }}
 
diff --git a/js/Cargo.toml b/js/Cargo.toml
index 8b76e97..2134c69 100644
--- a/js/Cargo.toml
+++ b/js/Cargo.toml
@@ -13,4 +13,4 @@ crate-type = ["cdylib"]
 
 [dependencies]
 python_template_rust = { path = "../rust", version = "*" }
-wasm-bindgen = "0.2.114"
+wasm-bindgen = "=0.2.115"
diff --git a/js/build.mjs b/js/build.mjs
index 76e31d1..40e8b47 100644
--- a/js/build.mjs
+++ b/js/build.mjs
@@ -1,10 +1,9 @@
 import { NodeModulesExternal } from "@finos/perspective-esbuild-plugin/external.js";
 import { build } from "@finos/perspective-esbuild-plugin/build.js";
-import { BuildCss } from "@prospective.co/procss/target/cjs/procss.js";
+import { transform } from "lightningcss";
 import { getarg } from "./tools/getarg.mjs";
 import fs from "fs";
 import cpy from "cpy";
-import path_mod from "path";
 
 const DEBUG = getarg("--debug");
 
@@ -40,31 +39,29 @@ const BUILD = [
 
 async function compile_css() {
   const process_path = (path) => {
-    const outpath = path.replace("src/less", "dist/css");
+    const outpath = path.replace("src/css", "dist/css");
     fs.mkdirSync(outpath, { recursive: true });
 
-    fs.readdirSync(path).forEach((file_or_folder) => {
-      if (file_or_folder.endsWith(".less")) {
-        const outfile = file_or_folder.replace(".less", ".css");
-        const builder = new BuildCss("");
-        builder.add(
-          `${path}/${file_or_folder}`,
-          fs
-            .readFileSync(path_mod.join(`${path}/${file_or_folder}`))
-            .toString(),
-        );
-        fs.writeFileSync(
-          `${path.replace("src/less", "dist/css")}/${outfile}`,
-          builder.compile().get(outfile),
-        );
-      } else {
-        process_path(`${path}/${file_or_folder}`);
+    fs.readdirSync(path, { withFileTypes: true }).forEach((entry) => {
+      const input = `${path}/${entry.name}`;
+      const output = `${outpath}/${entry.name}`;
+
+      if (entry.isDirectory()) {
+        process_path(input);
+      } else if (entry.isFile() && entry.name.endsWith(".css")) {
+        const source = fs.readFileSync(input);
+        const { code } = transform({
+          filename: entry.name,
+          code: source,
+          minify: !DEBUG,
+          sourceMap: false,
+        });
+        fs.writeFileSync(output, code);
       }
     });
   };
-  // recursively process all less files in src/less
-  process_path("src/less");
-  cpy("src/css/*", "dist/css/");
+
+  process_path("src/css");
 }
 
 async function copy_html() {
diff --git a/js/package.json b/js/package.json
index c07a2e1..52b7329 100644
--- a/js/package.json
+++ b/js/package.json
@@ -26,7 +26,7 @@
     "access": "public"
   },
   "scripts": {
-    "setup": "cargo install -f wasm-bindgen-cli --version 0.2.114",
+    "setup": "cargo install -f wasm-bindgen-cli --version 0.2.115 --locked",
     "build:debug": "node build.mjs --debug",
     "build:rust": "cargo build --release --all-features --target wasm32-unknown-unknown",
     "build:wasm-bindgen": "wasm-bindgen ../target/wasm32-unknown-unknown/release/python_template_rust.wasm --out-dir ./dist/pkg --target web",
@@ -34,10 +34,10 @@
     "build": "npm-run-all build:rust build:wasm-bindgen build:prod",
     "clean": "rm -rf dist lib playwright-report ../python_template_rust/extension",
     "dev": "npm-run-all -p start watch",
-    "lint:js": "prettier --check \"src/**/*.{js,ts,jsx,tsx,less,css}\" \"tests/**/*.{js,ts,jsx,tsx}\" \"*.mjs\" \"*.json\"",
+    "lint:js": "prettier --check \"src/**/*.{js,ts,jsx,tsx,css}\" \"tests/**/*.{js,ts,jsx,tsx}\" \"*.mjs\" \"*.json\"",
     "lint:rust": "cargo clippy --all-features && cargo fmt --all -- --check",
     "lint": "npm-run-all lint:*",
-    "fix:js": "prettier  --write \"src/**/*.{js,ts,jsx,tsx,less,css}\" \"tests/**/*.{js,ts,jsx,tsx}\" \"*.mjs\" \"*.json\"",
+    "fix:js": "prettier  --write \"src/**/*.{js,ts,jsx,tsx,css}\" \"tests/**/*.{js,ts,jsx,tsx}\" \"*.mjs\" \"*.json\"",
     "fix:rust": "cargo fmt --all",
     "fix": "npm-run-all fix:*",
     "preinstall": "npx only-allow pnpm",
@@ -47,16 +47,23 @@
     "test:js": "playwright test",
     "test:rust": "cargo test -- --show-output",
     "test": "npm-run-all test:rust test:js",
-    "watch": "nodemon --watch src -e ts,less,html --exec \"pnpm build:debug\""
+    "watch": "nodemon --watch src -e ts,css,html --exec \"pnpm build:debug\""
   },
   "dependencies": {},
   "devDependencies": {
     "@finos/perspective-esbuild-plugin": "^3.2.1",
+<<<<<<< before updating
     "@playwright/test": "^1.58.2",
     "@prospective.co/procss": "^0.1.18",
     "cpy": "^13.2.1",
     "esbuild": "^0.27.2",
     "esbuild-plugin-less": "^1.3.36",
+=======
+    "@playwright/test": "^1.56.1",
+    "cpy": "^12.1.0",
+    "esbuild": "^0.27.2",
+    "lightningcss": "^1.29.3",
+>>>>>>> after updating
     "http-server": "^14.1.1",
     "nodemon": "^3.1.14",
     "npm-run-all": "^4.1.5",
diff --git a/js/src/less/index.less b/js/src/css/index.css
similarity index 100%
rename from js/src/less/index.less
rename to js/src/css/index.css
diff --git a/rust/Makefile b/rust/Makefile
index 9e184ae..91a7013 100644
--- a/rust/Makefile
+++ b/rust/Makefile
@@ -5,7 +5,7 @@ requirements:  ## install required dev dependencies
 	rustup component add clippy
 	cargo install -f cargo-nextest --locked
 	cargo install -f cargo-llvm-cov
-	cargo install -f wasm-bindgen-cli --version 0.2.114
+	cargo install -f wasm-bindgen-cli --version 0.2.115 --locked
 	rustup target add wasm32-unknown-unknown
 
 develop: requirements  ## install required dev dependencies