diff --git a/pyproject.toml b/pyproject.toml
index cc1a7fb..0ef765f 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -26,7 +26,8 @@ classifiers = [
     "Topic :: Scientific/Engineering",
 ]
 dependencies = [
-    "pathsim>0.13",
+    # GLC block uses pathsim.blocks.BVP1D, introduced in pathsim 0.23
+    "pathsim>=0.23",
     "numpy>=1.15",
     "scipy>=1.2",
     # If a dependency ships native code that can't be installed in Pyodide,