diff --git a/CONTRIBUTORS.md b/CONTRIBUTORS.md
index 15b7dbe0..ecdaab09 100644
--- a/CONTRIBUTORS.md
+++ b/CONTRIBUTORS.md
@@ -74,3 +74,4 @@ of those changes to CLEARTYPE SRL.
 | [@karolinepauls](https://karolinepauls.com)            | Karoline Pauls         |
 | [@gurelkaynak](https://gurel.kaynak.link)              | Gurel Kaynak           |
 | [@ksoviero-zengrc](https://github.com/ksoviero-zengrc) | Kevin Soviero          |
+| [@mikeroll](https://github.com/mikeroll)               | Mikhail Bulash         |
diff --git a/dramatiq/rate_limits/backends/memcached.py b/dramatiq/rate_limits/backends/memcached.py
index 691f5b55..3655354d 100644
--- a/dramatiq/rate_limits/backends/memcached.py
+++ b/dramatiq/rate_limits/backends/memcached.py
@@ -72,9 +72,7 @@ def incr_and_sum(self, key, keys, amount, maximum, ttl):
                 if value > maximum:
                     return False
 
-                # TODO: Drop non-callable keys in Dramatiq v2.
-                key_list = keys() if callable(keys) else keys
-                mapping = client.get_multi(key_list)
+                mapping = client.get_multi(keys())
                 total = amount + sum(mapping.values())
                 if total > maximum:
                     return False
diff --git a/dramatiq/rate_limits/backends/redis.py b/dramatiq/rate_limits/backends/redis.py
index aa64a95b..bee914ea 100644
--- a/dramatiq/rate_limits/backends/redis.py
+++ b/dramatiq/rate_limits/backends/redis.py
@@ -83,16 +83,14 @@ def incr_and_sum(self, key, keys, amount, maximum, ttl):
         with self.client.pipeline() as pipe:
             while True:
                 try:
-                    # TODO: Drop non-callable keys in Dramatiq v2.
-                    key_list = keys() if callable(keys) else keys
-                    pipe.watch(key, *key_list)
+                    pipe.watch(key, *keys())
                     value = int(pipe.get(key) or b"0")
                     value += amount
                     if value > maximum:
                         return False
 
                     # Fetch keys again to account for net/server latency.
-                    values = pipe.mget(keys() if callable(keys) else keys)
+                    values = pipe.mget(keys())
                     total = amount + sum(int(n) for n in values if n)
                     if total > maximum:
                         return False
diff --git a/dramatiq/rate_limits/backends/stub.py b/dramatiq/rate_limits/backends/stub.py
index a5fb7002..d5b8d33d 100644
--- a/dramatiq/rate_limits/backends/stub.py
+++ b/dramatiq/rate_limits/backends/stub.py
@@ -63,9 +63,7 @@ def incr_and_sum(self, key, keys, amount, maximum, ttl):
             if value > maximum:
                 return False
 
-            # TODO: Drop non-callable keys in Dramatiq v2.
-            key_list = keys() if callable(keys) else keys
-            values = sum(self._get(k, default=0) for k in key_list)
+            values = sum(self._get(k, default=0) for k in keys())
             total = amount + values
             if total > maximum:
                 return False