diff --git a/CHANGELOG.md b/CHANGELOG.md
index 758bbce7..8769e07d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,19 @@
 
 
 
+## v4.0.5 (2024-10-22)
+
+### Fix
+
+* fix: last NP id fix, hopefully ([`a470460`](https://github.com/jbloomAus/SAELens/commit/a47046055664ee7a42322c41e1067d286e475d9b))
+
+### Unknown
+
+* Merge pull request #345 from jbloomAus/last_np_id_fix
+
+fix: last NP id fix, hopefully ([`d5a7906`](https://github.com/jbloomAus/SAELens/commit/d5a7906a676d688c44ff71245c1f3f3ba8419b1a))
+
+
 ## v4.0.4 (2024-10-22)
 
 ### Fix
diff --git a/pyproject.toml b/pyproject.toml
index 77625b3a..5d1025bd 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "sae-lens"
-version = "4.0.4"
+version = "4.0.5"
 description = "Training and Analyzing Sparse Autoencoders (SAEs)"
 authors = ["Joseph Bloom"]
 readme = "README.md"
diff --git a/sae_lens/__init__.py b/sae_lens/__init__.py
index a6abb122..7ca5ec0f 100644
--- a/sae_lens/__init__.py
+++ b/sae_lens/__init__.py
@@ -1,4 +1,4 @@
-__version__ = "4.0.4"
+__version__ = "4.0.5"
 
 
 from .analysis.hooked_sae_transformer import HookedSAETransformer