chore: upgrade plotly.js to v2.16.3

Bug fix: - Fixed hover on multicategory axes 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
plotly · cpsievert · Jan 19, 2026 · Dec 30, 2025 · Dec 30, 2025 · Dec 30, 2025
commit 6a56f88963a056aafc1e495df7ca9fe69b7ac889
diff --git a/PLOTLYJS_UPGRADE_LOG.md b/PLOTLYJS_UPGRADE_LOG.md
@@ -177,6 +177,15 @@ Tracking the upgrade of plotly.js from v2.11.1 to v2.25.2.
 ---
 
 ### v2.16.3
+- **Release Notes**: https://github.com/plotly/plotly.js/releases/tag/v2.16.3
+- **Status**: Complete
+- **Key Changes**:
+  - Fixed hover on multicategory axes
+- **Issues/Concerns**: None - bug fix only
+
+---
+
+### v2.16.4
 - **Status**: Not started
 
 ---

diff --git a/R/plotly.R b/R/plotly.R
@@ -479,7 +479,7 @@ typedArrayPolyfill <- function() {
 plotlyMainBundle <- function() {
   htmltools::htmlDependency(
     name = "plotly-main", 
-    version = "2.16.2",
+    version = "2.16.3",
     package = "plotly",
     src = dependency_dir("plotlyjs"),
     script = "plotly-latest.min.js",

diff --git a/inst/htmlwidgets/lib/plotlyjs/plotly-latest.min.js b/inst/htmlwidgets/lib/plotlyjs/plotly-latest.min.js
diff --git a/tools/update_plotlyjs.R b/tools/update_plotlyjs.R
@@ -2,7 +2,7 @@ library(httr)
 library(rprojroot)
 
 # Specify the version to update to (set to NULL for latest)
-PLOTLY_JS_VERSION <- "2.16.2"
+PLOTLY_JS_VERSION <- "2.16.3"
 
 # get zip URL to plotly.js release
 if (is.null(PLOTLY_JS_VERSION)) {