diff --git a/conformance/Makefile.am b/conformance/Makefile.am
index 7913463470..288c6cbc10 100644
--- a/conformance/Makefile.am
+++ b/conformance/Makefile.am
@@ -38,6 +38,7 @@ EXTRA_DIST =                  \
   failure_list_objc.txt       \
   failure_list_python.txt     \
   failure_list_python_cpp.txt \
+  failure_list_python-post26.txt \
   failure_list_ruby.txt
 
 conformance_test_runner_LDADD = $(top_srcdir)/src/libprotobuf.la
diff --git a/conformance/failure_list_csharp.txt b/conformance/failure_list_csharp.txt
index e69de29bb2..cd41597dbb 100644
--- a/conformance/failure_list_csharp.txt
+++ b/conformance/failure_list_csharp.txt
@@ -0,0 +1,176 @@
+DurationProtoInputTooLarge.JsonOutput
+DurationProtoInputTooSmall.JsonOutput
+FieldMaskNumbersDontRoundTrip.JsonOutput
+FieldMaskPathsDontRoundTrip.JsonOutput
+FieldMaskTooManyUnderscore.JsonOutput
+JsonInput.Any.JsonOutput
+JsonInput.Any.ProtobufOutput
+JsonInput.AnyNested.JsonOutput
+JsonInput.AnyNested.ProtobufOutput
+JsonInput.AnyUnorderedTypeTag.JsonOutput
+JsonInput.AnyUnorderedTypeTag.ProtobufOutput
+JsonInput.AnyWithDuration.JsonOutput
+JsonInput.AnyWithDuration.ProtobufOutput
+JsonInput.AnyWithFieldMask.JsonOutput
+JsonInput.AnyWithFieldMask.ProtobufOutput
+JsonInput.AnyWithInt32ValueWrapper.JsonOutput
+JsonInput.AnyWithInt32ValueWrapper.ProtobufOutput
+JsonInput.AnyWithStruct.JsonOutput
+JsonInput.AnyWithStruct.ProtobufOutput
+JsonInput.AnyWithTimestamp.JsonOutput
+JsonInput.AnyWithTimestamp.ProtobufOutput
+JsonInput.AnyWithValueForInteger.JsonOutput
+JsonInput.AnyWithValueForInteger.ProtobufOutput
+JsonInput.AnyWithValueForJsonObject.JsonOutput
+JsonInput.AnyWithValueForJsonObject.ProtobufOutput
+JsonInput.BoolFieldAllCapitalFalse
+JsonInput.BoolFieldAllCapitalTrue
+JsonInput.BoolFieldCamelCaseFalse
+JsonInput.BoolFieldCamelCaseTrue
+JsonInput.BoolMapFieldKeyNotQuoted
+JsonInput.BytesFieldInvalidBase64Characters
+JsonInput.BytesFieldNoPadding
+JsonInput.DoubleFieldInfinityNotQuoted
+JsonInput.DoubleFieldNanNotQuoted
+JsonInput.DoubleFieldNegativeInfinityNotQuoted
+JsonInput.DoubleFieldTooLarge
+JsonInput.DoubleFieldTooSmall
+JsonInput.DurationHas3FractionalDigits.Validator
+JsonInput.DurationHas6FractionalDigits.Validator
+JsonInput.DurationHas9FractionalDigits.Validator
+JsonInput.DurationHasZeroFractionalDigit.Validator
+JsonInput.DurationMaxValue.JsonOutput
+JsonInput.DurationMaxValue.ProtobufOutput
+JsonInput.DurationMinValue.JsonOutput
+JsonInput.DurationMinValue.ProtobufOutput
+JsonInput.DurationRepeatedValue.JsonOutput
+JsonInput.DurationRepeatedValue.ProtobufOutput
+JsonInput.EnumFieldNotQuoted
+JsonInput.EnumFieldNumericValueNonZero.JsonOutput
+JsonInput.EnumFieldNumericValueNonZero.ProtobufOutput
+JsonInput.EnumFieldNumericValueZero.JsonOutput
+JsonInput.EnumFieldNumericValueZero.ProtobufOutput
+JsonInput.EnumFieldUnknownValue.Validator
+JsonInput.FieldMask.JsonOutput
+JsonInput.FieldMask.ProtobufOutput
+JsonInput.FieldNameDuplicate
+JsonInput.FieldNameDuplicateDifferentCasing2
+JsonInput.FieldNameEscaped.JsonOutput
+JsonInput.FieldNameEscaped.ProtobufOutput
+JsonInput.FieldNameInLowerCamelCase.Validator
+JsonInput.FieldNameInSnakeCase.JsonOutput
+JsonInput.FieldNameInSnakeCase.ProtobufOutput
+JsonInput.FieldNameNotQuoted
+JsonInput.FieldNameWithMixedCases.JsonOutput
+JsonInput.FieldNameWithMixedCases.ProtobufOutput
+JsonInput.FieldNameWithMixedCases.Validator
+JsonInput.FieldNameWithNumbers.JsonOutput
+JsonInput.FieldNameWithNumbers.ProtobufOutput
+JsonInput.FieldNameWithNumbers.Validator
+JsonInput.FloatFieldInfinityNotQuoted
+JsonInput.FloatFieldNanNotQuoted
+JsonInput.FloatFieldNegativeInfinityNotQuoted
+JsonInput.Int32FieldLeadingZero
+JsonInput.Int32FieldMinFloatValue.JsonOutput
+JsonInput.Int32FieldMinValue.JsonOutput
+JsonInput.Int32FieldNegativeWithLeadingZero
+JsonInput.Int32FieldNotInteger
+JsonInput.Int32FieldPlusSign
+JsonInput.Int32MapFieldKeyNotQuoted
+JsonInput.Int64FieldMaxValueNotQuoted.JsonOutput
+JsonInput.Int64FieldMaxValueNotQuoted.ProtobufOutput
+JsonInput.Int64MapFieldKeyNotQuoted
+JsonInput.JsonWithComments
+JsonInput.MapFieldKeyIsNull
+JsonInput.MapFieldValueIsNull
+JsonInput.OneofFieldDuplicate
+JsonInput.OptionalBoolWrapper.JsonOutput
+JsonInput.OptionalBoolWrapper.ProtobufOutput
+JsonInput.OptionalBytesWrapper.JsonOutput
+JsonInput.OptionalBytesWrapper.ProtobufOutput
+JsonInput.OptionalDoubleWrapper.JsonOutput
+JsonInput.OptionalDoubleWrapper.ProtobufOutput
+JsonInput.OptionalFloatWrapper.JsonOutput
+JsonInput.OptionalFloatWrapper.ProtobufOutput
+JsonInput.OptionalInt32Wrapper.JsonOutput
+JsonInput.OptionalInt32Wrapper.ProtobufOutput
+JsonInput.OptionalInt64Wrapper.JsonOutput
+JsonInput.OptionalInt64Wrapper.ProtobufOutput
+JsonInput.OptionalStringWrapper.JsonOutput
+JsonInput.OptionalStringWrapper.ProtobufOutput
+JsonInput.OptionalUint32Wrapper.JsonOutput
+JsonInput.OptionalUint32Wrapper.ProtobufOutput
+JsonInput.OptionalUint64Wrapper.JsonOutput
+JsonInput.OptionalUint64Wrapper.ProtobufOutput
+JsonInput.OptionalWrapperTypesWithNonDefaultValue.JsonOutput
+JsonInput.OptionalWrapperTypesWithNonDefaultValue.ProtobufOutput
+JsonInput.OriginalProtoFieldName.JsonOutput
+JsonInput.OriginalProtoFieldName.ProtobufOutput
+JsonInput.RepeatedBoolWrapper.JsonOutput
+JsonInput.RepeatedBoolWrapper.ProtobufOutput
+JsonInput.RepeatedBytesWrapper.JsonOutput
+JsonInput.RepeatedBytesWrapper.ProtobufOutput
+JsonInput.RepeatedDoubleWrapper.JsonOutput
+JsonInput.RepeatedDoubleWrapper.ProtobufOutput
+JsonInput.RepeatedFieldMessageElementIsNull
+JsonInput.RepeatedFieldPrimitiveElementIsNull
+JsonInput.RepeatedFieldTrailingComma
+JsonInput.RepeatedFloatWrapper.JsonOutput
+JsonInput.RepeatedFloatWrapper.ProtobufOutput
+JsonInput.RepeatedInt32Wrapper.JsonOutput
+JsonInput.RepeatedInt32Wrapper.ProtobufOutput
+JsonInput.RepeatedInt64Wrapper.JsonOutput
+JsonInput.RepeatedInt64Wrapper.ProtobufOutput
+JsonInput.RepeatedStringWrapper.JsonOutput
+JsonInput.RepeatedStringWrapper.ProtobufOutput
+JsonInput.RepeatedUint32Wrapper.JsonOutput
+JsonInput.RepeatedUint32Wrapper.ProtobufOutput
+JsonInput.RepeatedUint64Wrapper.JsonOutput
+JsonInput.RepeatedUint64Wrapper.ProtobufOutput
+JsonInput.StringFieldInvalidEscape
+JsonInput.StringFieldSurrogateInWrongOrder
+JsonInput.StringFieldSurrogatePair.JsonOutput
+JsonInput.StringFieldUnpairedHighSurrogate
+JsonInput.StringFieldUnpairedLowSurrogate
+JsonInput.StringFieldUnterminatedEscape
+JsonInput.StringFieldUppercaseEscapeLetter
+JsonInput.Struct.JsonOutput
+JsonInput.Struct.ProtobufOutput
+JsonInput.TimestampHas3FractionalDigits.Validator
+JsonInput.TimestampHas6FractionalDigits.Validator
+JsonInput.TimestampHas9FractionalDigits.Validator
+JsonInput.TimestampHasZeroFractionalDigit.Validator
+JsonInput.TimestampMaxValue.JsonOutput
+JsonInput.TimestampMaxValue.ProtobufOutput
+JsonInput.TimestampMinValue.JsonOutput
+JsonInput.TimestampMinValue.ProtobufOutput
+JsonInput.TimestampRepeatedValue.JsonOutput
+JsonInput.TimestampRepeatedValue.ProtobufOutput
+JsonInput.TimestampWithNegativeOffset.JsonOutput
+JsonInput.TimestampWithNegativeOffset.ProtobufOutput
+JsonInput.TimestampWithPositiveOffset.JsonOutput
+JsonInput.TimestampWithPositiveOffset.ProtobufOutput
+JsonInput.TimestampZeroNormalized.Validator
+JsonInput.Uint32FieldNotInteger
+JsonInput.Uint32MapFieldKeyNotQuoted
+JsonInput.Uint64FieldMaxValueNotQuoted.JsonOutput
+JsonInput.Uint64FieldMaxValueNotQuoted.ProtobufOutput
+JsonInput.Uint64MapFieldKeyNotQuoted
+JsonInput.ValueAcceptBool.JsonOutput
+JsonInput.ValueAcceptBool.ProtobufOutput
+JsonInput.ValueAcceptFloat.JsonOutput
+JsonInput.ValueAcceptFloat.ProtobufOutput
+JsonInput.ValueAcceptInteger.JsonOutput
+JsonInput.ValueAcceptInteger.ProtobufOutput
+JsonInput.ValueAcceptList.JsonOutput
+JsonInput.ValueAcceptList.ProtobufOutput
+JsonInput.ValueAcceptNull.JsonOutput
+JsonInput.ValueAcceptNull.ProtobufOutput
+JsonInput.ValueAcceptObject.JsonOutput
+JsonInput.ValueAcceptObject.ProtobufOutput
+JsonInput.ValueAcceptString.JsonOutput
+JsonInput.ValueAcceptString.ProtobufOutput
+JsonInput.WrapperTypesWithNullValue.JsonOutput
+JsonInput.WrapperTypesWithNullValue.ProtobufOutput
+TimestampProtoInputTooLarge.JsonOutput
+TimestampProtoInputTooSmall.JsonOutput
diff --git a/conformance/failure_list_python-post26.txt b/conformance/failure_list_python-post26.txt
new file mode 100644
index 0000000000..19d99b044a
--- /dev/null
+++ b/conformance/failure_list_python-post26.txt
@@ -0,0 +1,2 @@
+JsonInput.StringFieldSurrogateInWrongOrder
+JsonInput.StringFieldUnpairedHighSurrogate