diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 4bff7b70..e4e1a340 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -10,12 +10,11 @@ jobs:
       fail-fast: false
       matrix:
         python:
-        - "3.7"
-        - "3.8"
         - "3.9"
         - "3.10"
         - "3.11"
         - "3.12"
+        - "3.13"
 
     steps:
     - uses: actions/checkout@v3
diff --git a/.gitignore b/.gitignore
index 64536afc..11882162 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,6 +1,5 @@
 *.egg-info
 *.pyc
-build
 /.coverage
 /.mxmake/
 /.project
@@ -8,20 +7,22 @@ build
 /.pydevproject.bak
 /.settings/
 /.vscode/
+/build/
 /constraints-mxdev.txt
 /coverage/
 /dist/
-/docs/Makefile
 /docs/cone.app.zip
 /docs/doctrees/
 /docs/html/
 /docs/latex/
 /docs/make.bat
+/docs/Makefile
 /htmlcov/
 /js/karma/
 /node_modules/
 /package-lock.json
 /pip-selfcheck.json
+/pnpm-lock.yaml
 /pyvenv.cfg
 /requirements-mxdev.txt
 /sources/
diff --git a/Makefile b/Makefile
index a044c172..d1b8331d 100644
--- a/Makefile
+++ b/Makefile
@@ -10,7 +10,7 @@
 #: docs.sphinx
 #: i18n.gettext
 #: i18n.lingua
-#: js.npm
+#: js.nodejs
 #: js.rollup
 #: js.scss
 #: js.wtr
@@ -46,32 +46,37 @@ INCLUDE_MAKEFILE?=include.mk
 # No default value.
 EXTRA_PATH?=
 
-## js.npm
+## js.nodejs
 
-# Value for `--prefix` option.
+# The package manager to use. Defaults to `npm`. Possible values
+# are `npm` and `pnpm`
+# Default: npm
+NODEJS_PACKAGE_MANAGER?=pnpm
+
+# Value for `--prefix` option when installing packages.
 # Default: .
-NPM_PREFIX?=.
+NODEJS_PREFIX?=.
 
-# Packages which get installed with `--no-save` option.
+# Packages to install with `--no-save` option.
 # No default value.
-NPM_PACKAGES?=
+NODEJS_PACKAGES?=
 
-# Packages which get installed with `--save-dev` option.
+# Packages to install with `--save-dev` option.
 # No default value.
-NPM_DEV_PACKAGES?=
+NODEJS_DEV_PACKAGES?=
 
-# Packages which get installed with `--save-prod` option.
+# Packages to install with `--save-prod` option.
 # No default value.
-NPM_PROD_PACKAGES?=
+NODEJS_PROD_PACKAGES?=
 
-# Packages which get installed with `--save-optional` option.
+# Packages to install with `--save-optional` option.
 # No default value.
-NPM_OPT_PACKAGES?=
+NODEJS_OPT_PACKAGES?=
 
 # Additional install options. Possible values are `--save-exact`
 # and `--save-bundle`.
 # No default value.
-NPM_INSTALL_OPTS?=
+NODEJS_INSTALL_OPTS?=
 
 ## js.wtr
 
@@ -115,8 +120,8 @@ ROLLUP_CONFIG?=js/rollup.conf.js
 PRIMARY_PYTHON?=python3
 
 # Minimum required Python version.
-# Default: 3.7
-PYTHON_MIN_VERSION?=3.7
+# Default: 3.9
+PYTHON_MIN_VERSION?=3.9
 
 # Install packages using the given package installer method.
 # Supported are `pip` and `uv`. If uv is used, its global availability is
@@ -278,79 +283,75 @@ $(SENTINEL): $(firstword $(MAKEFILE_LIST))
 	@echo "Sentinels for the Makefile process." > $(SENTINEL)
 
 ##############################################################################
-# npm
+# nodejs
 ##############################################################################
 
-export PATH:=$(shell pwd)/$(NPM_PREFIX)/node_modules/.bin:$(PATH)
+export PATH:=$(shell pwd)/$(NODEJS_PREFIX)/node_modules/.bin:$(PATH)
 
-# case `system.dependencies` domain is included
-SYSTEM_DEPENDENCIES+=npm
 
-NPM_TARGET:=$(SENTINEL_FOLDER)/npm.sentinel
-$(NPM_TARGET): $(SENTINEL)
-	@echo "Install npm packages"
-	@test -z "$(NPM_DEV_PACKAGES)" \
+NODEJS_TARGET:=$(SENTINEL_FOLDER)/nodejs.sentinel
+$(NODEJS_TARGET): $(SENTINEL)
+	@echo "Install nodejs packages"
+	@test -z "$(NODEJS_DEV_PACKAGES)" \
 		&& echo "No dev packages to be installed" \
-		|| npm --prefix $(NPM_PREFIX) install \
+		|| $(NODEJS_PACKAGE_MANAGER) --prefix $(NODEJS_PREFIX) install \
 			--save-dev \
-			$(NPM_INSTALL_OPTS) \
-			$(NPM_DEV_PACKAGES)
-	@test -z "$(NPM_PROD_PACKAGES)" \
+			$(NODEJS_INSTALL_OPTS) \
+			$(NODEJS_DEV_PACKAGES)
+	@test -z "$(NODEJS_PROD_PACKAGES)" \
 		&& echo "No prod packages to be installed" \
-		|| npm --prefix $(NPM_PREFIX) install \
+		|| $(NODEJS_PACKAGE_MANAGER) --prefix $(NODEJS_PREFIX) install \
 			--save-prod \
-			$(NPM_INSTALL_OPTS) \
-			$(NPM_PROD_PACKAGES)
-	@test -z "$(NPM_OPT_PACKAGES)" \
+			$(NODEJS_INSTALL_OPTS) \
+			$(NODEJS_PROD_PACKAGES)
+	@test -z "$(NODEJS_OPT_PACKAGES)" \
 		&& echo "No opt packages to be installed" \
-		|| npm --prefix $(NPM_PREFIX) install \
+		|| $(NODEJS_PACKAGE_MANAGER) --prefix $(NODEJS_PREFIX) install \
 			--save-optional \
-			$(NPM_INSTALL_OPTS) \
-			$(NPM_OPT_PACKAGES)
-	@test -z "$(NPM_PACKAGES)" \
+			$(NODEJS_INSTALL_OPTS) \
+			$(NODEJS_OPT_PACKAGES)
+	@test -z "$(NODEJS_PACKAGES)" \
 		&& echo "No packages to be installed" \
-		|| npm --prefix $(NPM_PREFIX) install \
+		|| $(NODEJS_PACKAGE_MANAGER) --prefix $(NODEJS_PREFIX) install \
 			--no-save \
-			$(NPM_PACKAGES)
-	@touch $(NPM_TARGET)
+			$(NODEJS_PACKAGES)
+	@touch $(NODEJS_TARGET)
 
-.PHONY: npm
-npm: $(NPM_TARGET)
+.PHONY: nodejs
+nodejs: $(NODEJS_TARGET)
 
-.PHONY: npm-dirty
-npm-dirty:
-	@rm -f $(NPM_TARGET)
+.PHONY: nodejs-dirty
+nodejs-dirty:
+	@rm -f $(NODEJS_TARGET)
 
-.PHONY: npm-clean
-npm-clean: npm-dirty
-	@rm -rf $(NPM_PREFIX)/node_modules
+.PHONY: nodejs-clean
+nodejs-clean: nodejs-dirty
+	@rm -rf $(NODEJS_PREFIX)/node_modules
 
-INSTALL_TARGETS+=npm
-DIRTY_TARGETS+=npm-dirty
-CLEAN_TARGETS+=npm-clean
+INSTALL_TARGETS+=nodejs
+DIRTY_TARGETS+=nodejs-dirty
+CLEAN_TARGETS+=nodejs-clean
 
 ##############################################################################
 # web test runner
 ##############################################################################
 
-# extend npm dev packages
-NPM_DEV_PACKAGES+=\
+NODEJS_DEV_PACKAGES+=\
 	@web/test-runner \
 	@web/dev-server-import-maps
 
 .PHONY: wtr
-wtr: $(NPM_TARGET)
+wtr: $(NODEJS_TARGET)
 	@web-test-runner $(WTR_OPTIONS) --config $(WTR_CONFIG)
 
 ##############################################################################
 # scss
 ##############################################################################
 
-# extend npm dev packages
-NPM_DEV_PACKAGES+=sass
+NODEJS_DEV_PACKAGES+=sass
 
 .PHONY: scss
-scss: $(NPM_TARGET)
+scss: $(NODEJS_TARGET)
 	@sass $(SCSS_OPTIONS) $(SCSS_SOURCE) $(SCSS_TARGET)
 	@sass $(SCSS_OPTIONS) --style compressed $(SCSS_SOURCE) $(SCSS_MIN_TARGET)
 
@@ -358,14 +359,13 @@ scss: $(NPM_TARGET)
 # rollup
 ##############################################################################
 
-# extend npm dev packages
-NPM_DEV_PACKAGES+=\
+NODEJS_DEV_PACKAGES+=\
 	rollup \
 	rollup-plugin-cleanup \
 	@rollup/plugin-terser
 
 .PHONY: rollup
-rollup: $(NPM_TARGET)
+rollup: $(NODEJS_TARGET)
 	@rollup --config $(ROLLUP_CONFIG)
 
 ##############################################################################
@@ -782,6 +782,10 @@ INSTALL_TARGETS+=$(LINGUA_TARGET)
 DIRTY_TARGETS+=lingua-dirty
 CLEAN_TARGETS+=lingua-clean
 
+##############################################################################
+# Custom includes
+##############################################################################
+
 -include $(INCLUDE_MAKEFILE)
 
 ##############################################################################
diff --git a/package.json b/package.json
index 7a1b59b1..4975f7c3 100644
--- a/package.json
+++ b/package.json
@@ -10,7 +10,8 @@
     "qunit": "^2.20.1",
     "rollup": "^2.79.2",
     "rollup-plugin-cleanup": "^3.2.1",
-    "sass": "^1.80.6",
+    "sass": "^1.81.0",
     "web-test-runner-qunit": "^2.0.0"
-  }
+  },
+  "packageManager": "pnpm@9.3.0+sha512.ee7b93e0c2bd11409c6424f92b866f31d3ea1bef5fbe47d3c7500cdc3c9668833d2e55681ad66df5b640c61fa9dc25d546efa54d76d7f8bf54b13614ac293631"
 }