diff --git a/zebra-chain/proptest-regressions/serialization.txt b/zebra-chain/proptest-regressions/serialization.txt
new file mode 100644
index 00000000..1d0b6bee
--- /dev/null
+++ b/zebra-chain/proptest-regressions/serialization.txt
@@ -0,0 +1,7 @@
+# Seeds for failure cases proptest has generated in the past. It is
+# automatically read and these particular cases re-run before any
+# novel cases are generated.
+#
+# It is recommended to check this file in to source control so that
+# everyone who runs the test benefits from these saved cases.
+cc ddefa5145f08994fb873af028344fc03d656dcd1f9287fac71dfa98cbd6a5090 # shrinks to s = 65536