diff --git a/ccm/lib/actr/core.py b/ccm/lib/actr/core.py
index 3619c59..54168fa 100755
--- a/ccm/lib/actr/core.py
+++ b/ccm/lib/actr/core.py
@@ -1,6 +1,6 @@
 
 import ccm
-import collections
+import typing
 
 class ACTR(ccm.ProductionSystem):
     production_time_sd=None
@@ -26,7 +26,7 @@ def _process_productions(self):
                 a=max(activations)
                 
                 threshold=self.production_threshold
-                if isinstance(threshold, collections.Callable): threshold=threshold()
+                if isinstance(threshold, typing.Callable): threshold=threshold()
                 
                 if threshold is not None and a<threshold:
                     for a in self._adaptors: a.below_threshold()
@@ -40,7 +40,7 @@ def _process_productions(self):
                 self.log.production=choice.name
                 
                 t=self.production_time
-                if isinstance(t, collections.Callable): t=t()
+                if isinstance(t, typing.Callable): t=t()
                 if self.production_time_sd is not None:
                     t=t+self.random.gauss(0,self.production_time_sd)
                 t-=self.production_match_delay
diff --git a/ccm/pattern.py b/ccm/pattern.py
index 26cafd6..da65994 100755
--- a/ccm/pattern.py
+++ b/ccm/pattern.py
@@ -1,5 +1,5 @@
 import re
-import collections
+import typing
 
 class PatternException(Exception):
     pass
@@ -91,7 +91,7 @@ def parse(patterns,bound=None):
             if p is None:
                 if name is None: funcs.append(lambda x,b: x==None)
                 else:            funcs.append(lambda x,b,name=name: x[name]==None or len(x[name])==0)
-            elif isinstance(p, collections.Callable):
+            elif isinstance(p, typing.Callable):
                 if name is None:
                   def callfunc(x,b,name=name,p=p):
                     return p(x,b)