diff --git a/pyproject.toml b/pyproject.toml
index 9885d23d..0724f836 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -22,7 +22,7 @@ dependencies = [
     "seaborn>=0.12.2",
     "xarray",
     "xarray-einstats>=0.5.1",
-    "pymc-experimental=0.0.9",
+    "pymc-experimental==0.0.9",
 ]
 
 [project.optional-dependencies]