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-rw-r--r--synapse/__init__.py2
-rw-r--r--synapse/python_dependencies.py4
-rw-r--r--synapse/util/iterutils.py2
3 files changed, 4 insertions, 4 deletions
diff --git a/synapse/__init__.py b/synapse/__init__.py
index d423856d82..3cd682f9e7 100644
--- a/synapse/__init__.py
+++ b/synapse/__init__.py
@@ -48,7 +48,7 @@ try:
 except ImportError:
     pass
 
-__version__ = "1.26.0rc1"
+__version__ = "1.26.0rc2"
 
 if bool(os.environ.get("SYNAPSE_TEST_PATCH_LOG_CONTEXTS", False)):
     # We import here so that we don't have to install a bunch of deps when
diff --git a/synapse/python_dependencies.py b/synapse/python_dependencies.py
index c97e0df1f5..bfd46a3730 100644
--- a/synapse/python_dependencies.py
+++ b/synapse/python_dependencies.py
@@ -86,8 +86,8 @@ REQUIREMENTS = [
 
 CONDITIONAL_REQUIREMENTS = {
     "matrix-synapse-ldap3": ["matrix-synapse-ldap3>=0.1"],
-    # we use execute_batch, which arrived in psycopg 2.7.
-    "postgres": ["psycopg2>=2.7"],
+    # we use execute_values with the fetch param, which arrived in psycopg 2.8.
+    "postgres": ["psycopg2>=2.8"],
     # ACME support is required to provision TLS certificates from authorities
     # that use the protocol, such as Let's Encrypt.
     "acme": [
diff --git a/synapse/util/iterutils.py b/synapse/util/iterutils.py
index 6ef2b008a4..8d2411513f 100644
--- a/synapse/util/iterutils.py
+++ b/synapse/util/iterutils.py
@@ -78,7 +78,7 @@ def sorted_topologically(
         if node not in degree_map:
             continue
 
-        for edge in edges:
+        for edge in set(edges):
             if edge in degree_map:
                 degree_map[node] += 1