diff --git a/docs/misc/changelog.rst b/docs/misc/changelog.rst
index e9d4b78..3fde0be 100644
--- a/docs/misc/changelog.rst
+++ b/docs/misc/changelog.rst
@@ -26,6 +26,7 @@ Deprecations:
 
 Others:
 ^^^^^^^
+- Fixed ``DictReplayBuffer.next_observations`` typing (@qgallouedec)
 
 Documentation:
 ^^^^^^^^^^^^^^
diff --git a/stable_baselines3/common/type_aliases.py b/stable_baselines3/common/type_aliases.py
index 7e69d39..f4c29ab 100644
--- a/stable_baselines3/common/type_aliases.py
+++ b/stable_baselines3/common/type_aliases.py
@@ -50,7 +50,7 @@ class ReplayBufferSamples(NamedTuple):
 class DictReplayBufferSamples(ReplayBufferSamples):
     observations: TensorDict
     actions: th.Tensor
-    next_observations: th.Tensor
+    next_observations: TensorDict
     dones: th.Tensor
     rewards: th.Tensor