diff --git a/conda_lock/src_parser/__init__.py b/conda_lock/src_parser/__init__.py
index 8ce156e41..98734ac18 100644
--- a/conda_lock/src_parser/__init__.py
+++ b/conda_lock/src_parser/__init__.py
@@ -7,7 +7,7 @@
 import typing
 
 from collections import defaultdict, namedtuple
-from itertools import chain
+from itertools import chain, product
 from typing import (
     TYPE_CHECKING,
     AbstractSet,
@@ -538,10 +538,27 @@ def aggregate_lock_specs(
     ):
         key = (dep.manager, dep.name)
         if key in unique_deps:
+            prev_dep = unique_deps[key]
+
             # Override existing, but merge selectors
-            previous_selectors = unique_deps[key].selectors
+            previous_selectors = prev_dep.selectors
             previous_selectors |= dep.selectors
             dep.selectors = previous_selectors
+
+            # If bold old and new are VersionedDependency, combine versions
+            if isinstance(prev_dep, VersionedDependency) and isinstance(
+                dep, VersionedDependency
+            ):
+                prev_versions = [
+                    set(sec.split(",")) for sec in prev_dep.version.split("|")
+                ]
+                new_versions = [set(sec.split(",")) for sec in dep.version.split("|")]
+                cross_versions = [
+                    prev | new for prev, new in product(prev_versions, new_versions)
+                ]
+                final_versions = set(",".join(subset) for subset in cross_versions)
+                dep.version = "|".join(final_versions)
+
         unique_deps[key] = dep
 
     dependencies = list(unique_deps.values())