diff --git a/.cz.toml b/.cz.toml
index b659844..b363b4e 100644
--- a/.cz.toml
+++ b/.cz.toml
@@ -2,7 +2,7 @@
 name = "cz_conventional_commits"
 bump_message = "bump: version $current_version → $new_version"
 version_format = "$version"
-version = "1.3.0"
+version = "1.3.1"
 version_files = [
     ".cz.toml:version",
     "zne/__init__.py:__version__",
diff --git a/CHANGELOG.md b/CHANGELOG.md
index f0626d7..bb17b81 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,9 @@
+## 1.3.1 (2024-02-06)
+
+### Refactor
+
+- drop BasePrimitiveResult.experiments and BasePrimitiveResult.num_experiments (#63)
+
 ## 1.3.0 (2024-02-05)
 
 ### Feat
diff --git a/CITATION.bib b/CITATION.bib
index 2c32519..c066f4e 100644
--- a/CITATION.bib
+++ b/CITATION.bib
@@ -3,7 +3,7 @@ @misc{zne
   title         = {Zero Noise Extrapolation prototype},
   year          = {2023},
   publisher     = {Zenodo},
-  version       = {1.3.0},
+  version       = {1.3.1},
   doi           = {},
   url           = {https://github.com/qiskit-community/prototype-zne},
 }
diff --git a/test/__init__.py b/test/__init__.py
index 96078ab..03c93fc 100644
--- a/test/__init__.py
+++ b/test/__init__.py
@@ -16,7 +16,7 @@
 
 
 def test_version():
-    assert __version__ == "1.3.0"
+    assert __version__ == "1.3.1"
 
 
 ################################################################################
diff --git a/zne/__init__.py b/zne/__init__.py
index 029363e..3b378c5 100644
--- a/zne/__init__.py
+++ b/zne/__init__.py
@@ -19,7 +19,7 @@
 from .zne_strategy import ZNEStrategy
 
 __copyright__ = "(C) Copyright IBM 2022"
-__version__ = "1.3.0"
+__version__ = "1.3.1"
 
 
 __all__ = [