diff --git a/CHANGES b/CHANGES
index 66032872..c7cad8f5 100644
--- a/CHANGES
+++ b/CHANGES
@@ -1,3 +1,8 @@
+0.10.12
+-------
+
+- Fixed incorrect content-type in `add_callback()` when headers are provided as a list of tuples.
+
 0.10.11
 -------
 
diff --git a/setup.py b/setup.py
index e719a89b..9405f159 100644
--- a/setup.py
+++ b/setup.py
@@ -54,7 +54,7 @@ def run_tests(self):
 
 setup(
     name="responses",
-    version="0.10.12-dev",
+    version="0.10.12",
     author="David Cramer",
     description=("A utility library for mocking out the `requests` Python library."),
     url="https://github.com/getsentry/responses",