Dependency on OpenTracing v0.10.0 throws exception in v2.5.6

I just checked out the latest version of the couchbase-net-client 2.5.6 and it seems to be broken.
I comparison to 2.5.5 it contains a dependency to OpenTracing v0.10.0 which is apparently unsigned and is causing an exception:

System.TypeInitializationException was unhandled by user code
HResult=-2146233036
Message=The type initializer for 'CouchbaseTest.CouchbaseTestService' threw an exception.
Source=CouchbaseTest
TypeName=CouchbaseTest.CouchbaseTestService
StackTrace:
at CouchbaseTest.CouchbaseTestService.Add[T](Document`1 document)
at CouchbaseTestTest.CouchbaseTest.TestMethod1() in C:\local\ Couchbase \CouchbaseTest\CouchbaseTest.cs:line 25
InnerException:
FileName=OpenTracing, Version=0.10.0.0, Culture=neutral, PublicKeyToken=null
FusionLog=""
HResult=-2146234300
Message=Could not load file or assembly 'OpenTracing, Version=0.10.0.0, Culture=neutral, PublicKeyToken=null' or one of its dependencies. A strongly-named assembly is required. (Exception from HRESULT: 0x80131044)
Source=Couchbase.NetClient
StackTrace:
at Couchbase.Configuration.Client.ClientConfiguration..ctor()
at CouchbaseTest.CouchbaseTestService..cctor() in C:\local\Couchbase\CouchbaseService\CouchbaseTestService.cs:line 15
InnerException: