diff --git a/DESCRIPTION b/DESCRIPTION
index f9840ac6..98a65748 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -54,7 +54,7 @@ Suggests:
     rmarkdown (>= 1.0.0),
     rstan (>= 2.17.1),
     rstanarm (>= 2.17.4),
-    rstantools (>= 1.5.0),
+    rstantools (>= 2.0.0),
     scales,
     shinystan (>= 2.3.0),
     survival,
diff --git a/NEWS.md b/NEWS.md
index 03326003..a25451d5 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -1,5 +1,6 @@
 # bayesplot (development version)
 
+* Bumped minimum version for `rstantools` from `>= 1.5.0` to `>= 2.0.0` .
 * Use `rlang::warn()` and `rlang::inform()` for selected PPC user messages instead of base `warning()` and `message()`.
 * Standardize input validation errors in `ppc_km_overlay()` and interpolation helpers to use `rlang::abort()` for consistent error handling.
 * Fix assignment-in-call bug in `mcmc_rank_ecdf()` (#).