diff --git a/ci/interop/v4.2.18.patch b/ci/interop/v4.2.18.patch
deleted file mode 100644
index fb969c5..0000000
--- a/ci/interop/v4.2.18.patch
+++ /dev/null
@@ -1,12 +0,0 @@
-diff --git a/Ecal/include/Ecal/Event/EcalVetoResult.h b/Ecal/include/Ecal/Event/EcalVetoResult.h
-index 8794058c9..8d950fb55 100644
---- a/Ecal/include/Ecal/Event/EcalVetoResult.h
-+++ b/Ecal/include/Ecal/Event/EcalVetoResult.h
-@@ -12,6 +12,7 @@
- //----------------//
- //   C++ StdLib   //
- //----------------//
-+#include <array>
- #include <iostream>
- #include <map>
- 
diff --git a/ci/ldmx-sw-to-test.json b/ci/ldmx-sw-to-test.json
index ebec724..eadaa7b 100644
--- a/ci/ldmx-sw-to-test.json
+++ b/ci/ldmx-sw-to-test.json
@@ -6,6 +6,6 @@
     "v4.0.5",
     "v4.1.4",
     "v4.2.14",
-    "v4.2.18"
+    "v4.2.20"
   ]
 }