diff --git a/cog.toml b/cog.toml
index 6d8c99871..267ed42f3 100644
--- a/cog.toml
+++ b/cog.toml
@@ -27,7 +27,7 @@ post_package_bump_hooks = [
     # prepare the github release changelog file
     "mkdir -p ../../releases",
     "../../tools/extract_changelog.sh CHANGELOG.md > ../../releases/GITHUB_CHANGELOG-{{package}}.md",
-    # update the version number to have a .dev0 suffix (when possible, only done for python plugins)
+    # update the version number to have a `dev0` suffix
     "../../tools/update_version.sh {{package}} {{version}} --dev",
     "git commit -m 'chore(version): update {{package}} version to {{version}}'",
     # push the tag and the commits to main 
diff --git a/plugins/matplotlib/src/deephaven/plugin/matplotlib/.gitignore b/plugins/matplotlib/src/deephaven/plugin/matplotlib/.gitignore
new file mode 100644
index 000000000..fd2ac954b
--- /dev/null
+++ b/plugins/matplotlib/src/deephaven/plugin/matplotlib/.gitignore
@@ -0,0 +1 @@
+_js/
\ No newline at end of file
diff --git a/plugins/ui/src/deephaven/ui/.gitignore b/plugins/ui/src/deephaven/ui/.gitignore
new file mode 100644
index 000000000..fd2ac954b
--- /dev/null
+++ b/plugins/ui/src/deephaven/ui/.gitignore
@@ -0,0 +1 @@
+_js/
\ No newline at end of file
diff --git a/tools/update_version.sh b/tools/update_version.sh
index 4f89bdf24..d8bbd62ef 100755
--- a/tools/update_version.sh
+++ b/tools/update_version.sh
@@ -136,8 +136,7 @@ case "$package" in
             update_file table-example/src/js/package.json '"version": "' '",'
             ;;
         ui)
-            update_file ui/src/js/package.json '"version": "' '",'
-            update_file ui/src/setup.cfg 'version = ' '' "$extra"
+            update_file ui/setup.cfg 'version = ' '' "$extra"
             ;;
         utilities)
             update_file utilities/setup.cfg 'version = ' '' "$extra"
@@ -152,4 +151,14 @@ case "$package" in
         }
 esac
 
+# We still need to bump these JS packages for Enterprise legacy reasons, even though they're packaged with Python
+npm_version="${version}"
+[ "$dev" = true ] && npm_version="${version}-dev0"
+case "$package" in
+    matplotlib | plotly | plotly-express | ui)
+        # The working directory is already `plugins/<package-name>`, so we just specify workspace as `src/js` and it does the right thing
+        npm version "$npm_version" --workspace=src/js
+        ;;
+esac
+
 log_info "Done updating $package version to $version${extra}"