diff --git a/maud/running_stan.py b/maud/running_stan.py
index f8402478..0a051d57 100644
--- a/maud/running_stan.py
+++ b/maud/running_stan.py
@@ -13,7 +13,7 @@
 
 from maud.data_model.maud_input import MaudInput
 
-CMDSTAN_VERSION = "2.32.2"
+CMDSTAN_VERSION = "2.33.1"
 
 HERE = os.path.dirname(os.path.abspath(__file__))
 DEFAULT_PRIOR_LOC_DRAIN = None