diff --git a/CHANGELOG.md b/CHANGELOG.md
index 66272b6..4e09b3a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,19 +1,26 @@
-# Release 0.12.0-dev
-
-### New features since last release
-
-### Breaking changes
+# Release 0.12.0
 
 ### Improvements
 
+* Speeds up the computation of expectation values by using native Qulacs methods.
+  [(#14)](https://github.com/PennyLaneAI/pennylane-qulacs/pull/14)
+
 ### Documentation
 
-### Bug fixes
+* Updates the installation instructions, to indicate how to install the PennyLane-Qulacs
+  plugin with either the CPU or GPU version of Qulacs.
+  [(#14)](https://github.com/PennyLaneAI/pennylane-qulacs/pull/14)
+
+* Adds note to the documentation showing how to use multiple OpenMP threads by setting the
+  `OMP_NUM_THREADS` environment variable.
+  [(#14)](https://github.com/PennyLaneAI/pennylane-qulacs/pull/14)
 
 ### Contributors
 
 This release contains contributions from (in alphabetical order):
 
+Theodor Isacsson, Maria Schuld.
+
 ---
 
 # Release 0.11.0
diff --git a/pennylane_qulacs/__init__.py b/pennylane_qulacs/__init__.py
index ed59978..3868bab 100644
--- a/pennylane_qulacs/__init__.py
+++ b/pennylane_qulacs/__init__.py
@@ -14,4 +14,4 @@
 """
 PennyLane-Qulacs plugin.
 """
-__version__ = "0.12.0-dev"
+__version__ = "0.12.0"