diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index defe9d7a..f562ae32 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -17,13 +17,13 @@ jobs:
     # job.
     strategy:
       matrix:
-        python-version: [3.6, 3.7, 3.8, 3.9, 3.10.0-rc.1]
+        python-version: ["3.6", "3.7", "3.8", "3.9", "3.10"]
         os: [ubuntu-latest, macos-latest, windows-latest]
         loop: [asyncio, uvloop]
         exclude:
           # uvloop does not support Python 3.6
           - loop: uvloop
-            python-version: 3.6
+            python-version: "3.6"
           # uvloop does not support windows
           - loop: uvloop
             os: windows-latest
@@ -79,7 +79,7 @@ jobs:
   test-postgres:
     strategy:
       matrix:
-        postgres-version: [9.5, 9.6, 10, 11, 12, 13]
+        postgres-version: ["9.5", "9.6", "10", "11", "12", "13", "14"]
 
     runs-on: ubuntu-latest
 
diff --git a/README.rst b/README.rst
index 2f5da7a4..2ed14726 100644
--- a/README.rst
+++ b/README.rst
@@ -14,7 +14,7 @@ framework.  You can read more about asyncpg in an introductory
 `blog post <http://magic.io/blog/asyncpg-1m-rows-from-postgres-to-python/>`_.
 
 asyncpg requires Python 3.6 or later and is supported for PostgreSQL
-versions 9.5 to 13.  Older PostgreSQL versions or other databases implementing
+versions 9.5 to 14.  Older PostgreSQL versions or other databases implementing
 the PostgreSQL protocol *may* work, but are not being actively tested.
 
 
diff --git a/asyncpg/exceptions/__init__.py b/asyncpg/exceptions/__init__.py
index af46a754..c5b5ccc4 100644
--- a/asyncpg/exceptions/__init__.py
+++ b/asyncpg/exceptions/__init__.py
@@ -337,6 +337,10 @@ class DuplicateJsonObjectKeyValueError(DataError):
     sqlstate = '22030'
 
 
+class InvalidArgumentForSQLJsonDatetimeFunctionError(DataError):
+    sqlstate = '22031'
+
+
 class InvalidJsonTextError(DataError):
     sqlstate = '22032'
 
@@ -872,6 +876,10 @@ class DatabaseDroppedError(OperatorInterventionError):
     sqlstate = '57P04'
 
 
+class IdleSessionTimeoutError(OperatorInterventionError):
+    sqlstate = '57P05'
+
+
 class PostgresSystemError(_base.PostgresError):
     sqlstate = '58000'
 
@@ -1086,8 +1094,8 @@ class IndexCorruptedError(InternalServerError):
     'ForeignKeyViolationError', 'FunctionExecutedNoReturnStatementError',
     'GeneratedAlwaysError', 'GroupingError',
     'HeldCursorRequiresSameIsolationLevelError',
-    'IdleInTransactionSessionTimeoutError', 'ImplicitZeroBitPadding',
-    'InFailedSQLTransactionError',
+    'IdleInTransactionSessionTimeoutError', 'IdleSessionTimeoutError',
+    'ImplicitZeroBitPadding', 'InFailedSQLTransactionError',
     'InappropriateAccessModeForBranchTransactionError',
     'InappropriateIsolationLevelForBranchTransactionError',
     'IndeterminateCollationError', 'IndeterminateDatatypeError',
@@ -1098,6 +1106,7 @@ class IndexCorruptedError(InternalServerError):
     'InvalidArgumentForNthValueFunctionError',
     'InvalidArgumentForNtileFunctionError',
     'InvalidArgumentForPowerFunctionError',
+    'InvalidArgumentForSQLJsonDatetimeFunctionError',
     'InvalidArgumentForWidthBucketFunctionError',
     'InvalidAuthorizationSpecificationError',
     'InvalidBinaryRepresentationError', 'InvalidCachedStatementError',
diff --git a/docs/index.rst b/docs/index.rst
index 57031b03..87c43aa8 100644
--- a/docs/index.rst
+++ b/docs/index.rst
@@ -15,7 +15,8 @@ of PostgreSQL server binary protocol for use with Python's ``asyncio``
 framework.
 
 **asyncpg** requires Python 3.6 or later and is supported for PostgreSQL
-versions 9.5 to 13.
+versions 9.5 to 14.  Older PostgreSQL versions or other databases implementing
+the PostgreSQL protocol *may* work, but are not being actively tested.
 
 Contents
 --------
diff --git a/tools/generate_exceptions.py b/tools/generate_exceptions.py
index 2e7477c3..0b626558 100755
--- a/tools/generate_exceptions.py
+++ b/tools/generate_exceptions.py
@@ -176,9 +176,11 @@ def _add_class(clsname, base, sqlstate, docstring):
     buf += '\n\n\n'.join(classes)
 
     _all = textwrap.wrap(', '.join('{!r}'.format(c) for c in sorted(clsnames)))
-    buf += '\n\n\n__all__ = _base.__all__ + (\n    {}\n)'.format(
+    buf += '\n\n\n__all__ = (\n    {}\n)'.format(
         '\n    '.join(_all))
 
+    buf += '\n\n__all__ += _base.__all__'
+
     print(buf)