diff --git a/changelog.d/5980.feature b/changelog.d/5980.feature
index f25d8d81d..e20117cf1 100644
--- a/changelog.d/5980.feature
+++ b/changelog.d/5980.feature
@@ -1 +1 @@
-Add POST /_matrix/client/r0/account/3pid/unbind endpoint from MSC2140 for unbinding a 3PID from an identity server without removing it from the homeserver user account.
\ No newline at end of file
+Add POST /_matrix/client/unstable/account/3pid/unbind endpoint from MSC2140 for unbinding a 3PID from an identity server without removing it from the homeserver user account.
diff --git a/changelog.d/6062.bugfix b/changelog.d/6062.bugfix
new file mode 100644
index 000000000..e20117cf1
--- /dev/null
+++ b/changelog.d/6062.bugfix
@@ -0,0 +1 @@
+Add POST /_matrix/client/unstable/account/3pid/unbind endpoint from MSC2140 for unbinding a 3PID from an identity server without removing it from the homeserver user account.
diff --git a/synapse/rest/client/v2_alpha/account.py b/synapse/rest/client/v2_alpha/account.py
index afaaeeacd..ce1487dbc 100644
--- a/synapse/rest/client/v2_alpha/account.py
+++ b/synapse/rest/client/v2_alpha/account.py
@@ -529,7 +529,7 @@ class ThreepidRestServlet(RestServlet):
 
 
 class ThreepidUnbindRestServlet(RestServlet):
-    PATTERNS = client_patterns("/account/3pid/unbind$")
+    PATTERNS = client_patterns("/account/3pid/unbind$", releases=(), unstable=True)
 
     def __init__(self, hs):
         super(ThreepidUnbindRestServlet, self).__init__()