diff --git a/.bumpversion.toml b/.bumpversion.toml
index b0109fd..b5f2fb9 100644
--- a/.bumpversion.toml
+++ b/.bumpversion.toml
@@ -1,5 +1,5 @@
 [tool.bumpversion]
-current_version = "v0.6.2"
+current_version = "v0.6.3"
 commit = true
 commit_args = "--no-verify"
 tag = true
diff --git a/README.md b/README.md
index 8363d46..1b4b1e6 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,5 @@
 # totypes - Custom types for topology optimization
-`v0.6.2`
+`v0.6.3`
 
 ## Overview
 
diff --git a/pyproject.toml b/pyproject.toml
index 72683f5..06ca471 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,7 +1,7 @@
 [project]
 
 name = "totypes"
-version = "v0.6.2"
+version = "v0.6.3"
 description = "Custom datatypes useful in a topology optimization context"
 keywords = ["topology", "optimization", "jax", "inverse design"]
 readme = "README.md"
diff --git a/src/totypes/__init__.py b/src/totypes/__init__.py
index 44359ff..2400235 100644
--- a/src/totypes/__init__.py
+++ b/src/totypes/__init__.py
@@ -3,7 +3,7 @@
 Copyright (c) 2023 The INVRS-IO authors.
 """
 
-__version__ = "v0.6.2"
+__version__ = "v0.6.3"
 __author__ = "Martin F. Schubert <mfschubert@gmail.com>"
 
 __all__ = ["json_utils", "symmetry", "types"]
diff --git a/src/totypes/types.py b/src/totypes/types.py
index 4feade4..f17c57e 100644
--- a/src/totypes/types.py
+++ b/src/totypes/types.py
@@ -66,9 +66,9 @@ def __post_init__(self) -> None:
             )
 
         if self.upper_bound is not None and self.lower_bound is not None:
-            invalid_bounds = self.lower_bound >= self.upper_bound
-            is_array = isinstance(invalid_bounds, (jnp.ndarray, onp.ndarray))
             with jax.ensure_compile_time_eval():
+                invalid_bounds = self.lower_bound >= self.upper_bound
+                is_array = isinstance(invalid_bounds, (jnp.ndarray, onp.ndarray))
                 if (
                     is_array
                     and invalid_bounds.any()  # type: ignore[union-attr]