diff --git a/files/etc/apt/preferences.d/microsoft-edge b/files/etc/apt/preferences.d/microsoft-edge
new file mode 100644
index 0000000..d0dcb16
--- /dev/null
+++ b/files/etc/apt/preferences.d/microsoft-edge
@@ -0,0 +1,16 @@
+# Ignore all packages from this repository by default
+Package: *
+Pin: origin packages.microsoft.com
+Pin-Priority: 1
+
+Package: microsoft-edge-stable
+Pin: origin packages.microsoft.com
+Pin-Priority: 500
+
+Package: microsoft-edge-beta
+Pin: origin packages.microsoft.com
+Pin-Priority: 500
+
+Package: microsoft-edge-dev
+Pin: origin packages.microsoft.com
+Pin-Priority: 500
diff --git a/files/etc/apt/preferences.d/microsoft-vscode b/files/etc/apt/preferences.d/microsoft-vscode
index dc134ac..4820cf6 100644
--- a/files/etc/apt/preferences.d/microsoft-vscode
+++ b/files/etc/apt/preferences.d/microsoft-vscode
@@ -6,3 +6,7 @@ Pin-Priority: 1
 Package: code
 Pin: origin packages.microsoft.com
 Pin-Priority: 500
+
+Package: code-insiders
+Pin: origin packages.microsoft.com
+Pin-Priority: 500
diff --git a/files/etc/apt/preferences.d/nodesource b/files/etc/apt/preferences.d/nodesource
new file mode 100644
index 0000000..04221c3
--- /dev/null
+++ b/files/etc/apt/preferences.d/nodesource
@@ -0,0 +1,9 @@
+# Ignore all packages from this repository by default
+Package: *
+Pin: origin deb.nodesource.com
+Pin-Priority: 1
+
+# Node.js
+Package: nodejs
+Pin: origin deb.nodesource.com
+Pin-Priority: 500
diff --git a/files/etc/apt/preferences.d/yarnpkg b/files/etc/apt/preferences.d/yarnpkg
new file mode 100644
index 0000000..37382c7
--- /dev/null
+++ b/files/etc/apt/preferences.d/yarnpkg
@@ -0,0 +1,8 @@
+# Ignore all packages from this repository by default
+Package: *
+Pin: origin dl.yarnpkg.com
+Pin-Priority: 1
+
+Package: yarn
+Pin: origin dl.yarnpkg.com
+Pin-Priority: 500
diff --git a/files/etc/apt/sources.list.d/microsoft-edge.list b/files/etc/apt/sources.list.d/microsoft-edge.list
new file mode 100644
index 0000000..d86df30
--- /dev/null
+++ b/files/etc/apt/sources.list.d/microsoft-edge.list
@@ -0,0 +1 @@
+deb [arch=amd64,arm64 signed-by=/usr/local/share/keyrings/microsoft.gpg] https://packages.microsoft.com/repos/edge stable main
diff --git a/files/etc/apt/sources.list.d/microsoft-vscode.list b/files/etc/apt/sources.list.d/microsoft-vscode.list
index 1ace724..7ae3ce4 100644
--- a/files/etc/apt/sources.list.d/microsoft-vscode.list
+++ b/files/etc/apt/sources.list.d/microsoft-vscode.list
@@ -1 +1 @@
-deb [arch=amd64 signed-by=/usr/local/share/keyrings/microsoft.gpg] https://packages.microsoft.com/repos/code stable main
+deb [arch=amd64,arm64 signed-by=/usr/local/share/keyrings/microsoft.gpg] https://packages.microsoft.com/repos/code stable main
diff --git a/files/etc/apt/sources.list.d/nodesource.list b/files/etc/apt/sources.list.d/nodesource.list
new file mode 100644
index 0000000..baf5952
--- /dev/null
+++ b/files/etc/apt/sources.list.d/nodesource.list
@@ -0,0 +1 @@
+deb [signed-by=/usr/local/share/keyrings/nodesource.gpg] https://deb.nodesource.com/node_16.x bookworm main
diff --git a/files/etc/apt/sources.list.d/yarnpkg.list b/files/etc/apt/sources.list.d/yarnpkg.list
new file mode 100644
index 0000000..cdcb447
--- /dev/null
+++ b/files/etc/apt/sources.list.d/yarnpkg.list
@@ -0,0 +1 @@
+deb [signed-by=/usr/local/share/keyrings/yarnpkg.gpg] https://dl.yarnpkg.com/debian/ stable main
diff --git a/files/etc/default/microsoft-edge-beta b/files/etc/default/microsoft-edge-beta
new file mode 100644
index 0000000..8620a60
--- /dev/null
+++ b/files/etc/default/microsoft-edge-beta
@@ -0,0 +1,4 @@
+# These settings are required to prevent the postinst script
+# from modifying /etc/apt/sources.list.d
+repo_add_once="false"
+repo_reenable_on_distupgrade="false"
diff --git a/files/etc/default/microsoft-edge-dev b/files/etc/default/microsoft-edge-dev
new file mode 100644
index 0000000..8620a60
--- /dev/null
+++ b/files/etc/default/microsoft-edge-dev
@@ -0,0 +1,4 @@
+# These settings are required to prevent the postinst script
+# from modifying /etc/apt/sources.list.d
+repo_add_once="false"
+repo_reenable_on_distupgrade="false"
diff --git a/files/etc/default/microsoft-edge-stable b/files/etc/default/microsoft-edge-stable
new file mode 100644
index 0000000..8620a60
--- /dev/null
+++ b/files/etc/default/microsoft-edge-stable
@@ -0,0 +1,4 @@
+# These settings are required to prevent the postinst script
+# from modifying /etc/apt/sources.list.d
+repo_add_once="false"
+repo_reenable_on_distupgrade="false"
diff --git a/files/usr/local/share/keyrings/google-chrome.gpg b/files/usr/local/share/keyrings/google-chrome.gpg
index 494036a..acdb00d 100644
Binary files a/files/usr/local/share/keyrings/google-chrome.gpg and b/files/usr/local/share/keyrings/google-chrome.gpg differ
diff --git a/files/usr/local/share/keyrings/nodesource.gpg b/files/usr/local/share/keyrings/nodesource.gpg
new file mode 100644
index 0000000..4f3ec4e
Binary files /dev/null and b/files/usr/local/share/keyrings/nodesource.gpg differ
diff --git a/files/usr/local/share/keyrings/yarnpkg.gpg b/files/usr/local/share/keyrings/yarnpkg.gpg
new file mode 100644
index 0000000..686583c
Binary files /dev/null and b/files/usr/local/share/keyrings/yarnpkg.gpg differ
diff --git a/install-system.sh b/install-system.sh
index 988a3db..04851de 100755
--- a/install-system.sh
+++ b/install-system.sh
@@ -23,34 +23,73 @@ echo "--> Removing redundant/unnecessary files..."
 
 FILES="$PROJECT_ROOT/files"
 
-if prompt "Install Chrome repositories? (y/N)"; then
-    make_directory "/etc/apt/preferences.d"
-    copy "$FILES/etc/apt/preferences.d/google-chrome" "/etc/apt/preferences.d/google-chrome"
+make_directory "/etc/apt/preferences.d"
+make_directory "/etc/apt/sources.list.d"
+make_directory "/etc/default"
+make_directory "/usr/local/share/keyrings"
 
-    make_directory "/etc/apt/sources.list.d"
+if prompt "Install Google Chrome repositories? (y/N)"; then
+    copy "$FILES/etc/apt/preferences.d/google-chrome" "/etc/apt/preferences.d/google-chrome"
     copy "$FILES/etc/apt/sources.list.d/google-chrome.list" "/etc/apt/sources.list.d/google-chrome.list"
 
-    make_directory "/etc/default"
-    copy "$FILES/etc/default/google-chrome" "/etc/default/google-chrome"
-
-    make_directory "/usr/local/share/keyrings"
+    # Install repository-specific keyring
     copy "$FILES/usr/local/share/keyrings/google-chrome.gpg" "/usr/local/share/keyrings/google-chrome.gpg"
+
+    # Prevent Chrome from adding repositories and keys, since
+    # we want to manage these ourselves.
+    copy "$FILES/etc/default/google-chrome" "/etc/default/google-chrome"
 else
     remove "/etc/apt/sources.list.d/google-chrome.list"
 fi
 
+if prompt "Install Microsoft Edge repositories? (y/N)"; then
+    copy "$FILES/etc/apt/preferences.d/microsoft-edge" "/etc/apt/preferences.d/microsoft-edge"
+    copy "$FILES/etc/apt/sources.list.d/microsoft-edge.list" "/etc/apt/sources.list.d/microsoft-edge.list"
+
+    # Install repository-specific keyring
+    copy "$FILES/usr/local/share/keyrings/microsoft.gpg" "/usr/local/share/keyrings/microsoft.gpg"
+
+    # Prevent Edge from adding repositories and keys, since
+    # we want to manage these ourselves.
+    copy "$FILES/etc/default/microsoft-edge-beta" "/etc/default/microsoft-edge-beta"
+    copy "$FILES/etc/default/microsoft-edge-dev" "/etc/default/microsoft-edge-dev"
+else
+    remove "/etc/apt/sources.list.d/microsoft-edge.list"
+fi
+
 if prompt "Install Microsoft Visual Studio Code repositories? (y/N)"; then
-    make_directory "/etc/apt/preferences.d"
     copy "$FILES/etc/apt/preferences.d/microsoft-vscode" "/etc/apt/preferences.d/microsoft-vscode"
-
-    make_directory "/etc/apt/sources.list.d"
     copy "$FILES/etc/apt/sources.list.d/microsoft-vscode.list" "/etc/apt/sources.list.d/microsoft-vscode.list"
 
-    make_directory "/usr/local/share/keyrings"
+    # Install repository-specific keyring
     copy "$FILES/usr/local/share/keyrings/microsoft.gpg" "/usr/local/share/keyrings/microsoft.gpg"
+
+    # VSCode will look for a vscode.list file, but we want to manage
+    # things manually, so ensure it's empty.
+    echo >"/etc/apt/sources.list.d/vscode.list"
 else
     remove "/etc/apt/sources.list.d/microsoft-vscode.list"
 fi
 
+if prompt "Install NodeSource repositories? (y/N)"; then
+    copy "$FILES/etc/apt/preferences.d/nodesource" "/etc/apt/preferences.d/nodesource"
+    copy "$FILES/etc/apt/sources.list.d/nodesource.list" "/etc/apt/sources.list.d/nodesource.list"
+
+    # Install repository-specific keyring
+    copy "$FILES/usr/local/share/keyrings/nodesource.gpg" "/usr/local/share/keyrings/nodesource.gpg"
+else
+    remove "/etc/apt/sources.list.d/nodesource.list"
+fi
+
+if prompt "Install Yarnpkg repositories? (y/N)"; then
+    copy "$FILES/etc/apt/preferences.d/yarnpkg" "/etc/apt/preferences.d/yarnpkg"
+    copy "$FILES/etc/apt/sources.list.d/yarnpkg.list" "/etc/apt/sources.list.d/yarnpkg.list"
+
+    # Install repository-specific keyring
+    copy "$FILES/usr/local/share/keyrings/yarnpkg.gpg" "/usr/local/share/keyrings/yarnpkg.gpg"
+else
+    remove "/etc/apt/sources.list.d/yarnpkg.list"
+fi
+
 echo
 echo "==> system installation completed successfully"
diff --git a/update-keys.sh b/update-keys.sh
index ea056c3..975b981 100755
--- a/update-keys.sh
+++ b/update-keys.sh
@@ -20,4 +20,12 @@ pushd "$PROJECT_ROOT/files/usr/local/share/keyrings"
     # Microsoft repository signing key (Edge and Code)
     curl "${curl_flags[@]}" "https://packages.microsoft.com/keys/microsoft.asc" | \
         gpg --dearmor --output="microsoft.gpg"
+
+    # NodeSource signing key
+    curl "${curl_flags[@]}" "https://deb.nodesource.com/gpgkey/nodesource.gpg.key" | \
+        gpg --dearmor  --output="nodesource.gpg"
+
+    # Yarnpkg signing key
+    curl "${curl_flags[@]}" "https://dl.yarnpkg.com/debian/pubkey.gpg" | \
+        gpg --dearmor  --output="yarnpkg.gpg"
 popd