diff --git a/.gitmodules b/.gitmodules
index 7c61adff2..e480e55ef 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -13,7 +13,7 @@
 [submodule "libs/shared/flagd-core/test-harness"]
 	path = libs/shared/flagd-core/test-harness
 	url = https://github.com/open-feature/flagd-testbed
-	branch = v0.5.13
+	branch = v0.5.20
 [submodule "libs/shared/flagd-core/spec"]
 	path = libs/shared/flagd-core/spec
 	url = https://github.com/open-feature/spec
diff --git a/libs/shared/flagd-core/test-harness b/libs/shared/flagd-core/test-harness
index 36b07d5bd..706a7e951 160000
--- a/libs/shared/flagd-core/test-harness
+++ b/libs/shared/flagd-core/test-harness
@@ -1 +1 @@
-Subproject commit 36b07d5bddbe854e05e60f5ea93ca70cf1a7b5c5
+Subproject commit 706a7e951bb72a145523b38fe83060becc34c4d7