diff --git a/pyproject.toml b/pyproject.toml
index b1c4a6bdd6..d2915dc824 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -41,7 +41,9 @@ dependencies = [
     "casadi>=3.6.3",
     "xarray>=2022.6.0",
     "anytree>=2.8.0",
+    # Temporary addition to be removed later, this is a bug (SymPy breaks PyBaMM import)
     "typing-extensions",
+    "sympy>=1.12"
 ]
 
 [project.urls]