diff --git a/angr_platforms/bf/engine_bf.py b/angr_platforms/bf/engine_bf.py
index a7a7cf7..054f7a7 100644
--- a/angr_platforms/bf/engine_bf.py
+++ b/angr_platforms/bf/engine_bf.py
@@ -5,7 +5,7 @@
 l = logging.getLogger(__name__)
 
 
-class BFMixin(angr.engines.SuccessorsMixin):
+class BFMixin(angr.engines.SuccessorsEngine):
     """
     This is a SimEngine mixin for executing BrainFuck.  Oh yeah, you're not hallucinating.
     """
diff --git a/angr_platforms/ct64/ct64_engine.py b/angr_platforms/ct64/ct64_engine.py
index 2cd5480..b3a9198 100644
--- a/angr_platforms/ct64/ct64_engine.py
+++ b/angr_platforms/ct64/ct64_engine.py
@@ -1,7 +1,7 @@
 import angr
 import claripy
 
-class CT64KMixin(angr.engines.SuccessorsMixin):
+class CT64KMixin(angr.engines.SuccessorsEngine):
     def process_successors(self, successors, **kwargs):
         state = self.state
         if state.arch.name != 'CT64K':