diff --git a/package.json b/package.json
index a149062b2..dfc030fe9 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "js-slang",
-  "version": "1.0.65",
+  "version": "1.0.66",
   "license": "Apache-2.0",
   "description": "Javascript-based implementations of Source, written in Typescript",
   "keywords": [
diff --git a/src/py-slang b/src/py-slang
index 0c6848b63..3f50a9982 160000
--- a/src/py-slang
+++ b/src/py-slang
@@ -1 +1 @@
-Subproject commit 0c6848b631e90bb15830b1df5db91a688485929c
+Subproject commit 3f50a99829b481fe11ce71b213dd4f18d55198c8