diff --git a/setup.cfg b/setup.cfg
index a64e81f..befe14f 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -7,8 +7,6 @@ description = A general framework for setting up parameter estimation problems.
 long_description = file: README.md
 long_description_content_type = text/markdown
 classifiers =
-    Programming Language :: Python :: 3.8
-    Programming Language :: Python :: 3.9
     Programming Language :: Python :: 3.10
     Programming Language :: Python :: 3.11
     Programming Language :: Python :: 3.12
@@ -28,7 +26,7 @@ install_requires =
     matplotlib<4
     emcee<4
     tabulate<1
-    arviz>0.18.0
+    arviz<1
     loguru<1
     rdflib<7
     owlready2<1