diff --git a/.changes/1.34.66.json b/.changes/1.34.66.json
new file mode 100644
index 0000000000..ea50377001
--- /dev/null
+++ b/.changes/1.34.66.json
@@ -0,0 +1,27 @@
+[
+  {
+    "category": "``cloudformation``",
+    "description": "[``botocore``] Documentation update, March 2024. Corrects some formatting.",
+    "type": "api-change"
+  },
+  {
+    "category": "``ec2``",
+    "description": "[``botocore``] This release adds the new DescribeMacHosts API operation for getting information about EC2 Mac Dedicated Hosts. Users can now see the latest macOS versions that their underlying Apple Mac can support without needing to be updated.",
+    "type": "api-change"
+  },
+  {
+    "category": "``finspace``",
+    "description": "[``botocore``] Adding new attributes readWrite and onDemand to dataview models for Database Maintenance operations.",
+    "type": "api-change"
+  },
+  {
+    "category": "``logs``",
+    "description": "[``botocore``] Update LogSamples field in Anomaly model to be a list of LogEvent",
+    "type": "api-change"
+  },
+  {
+    "category": "``managedblockchain-query``",
+    "description": "[``botocore``] Introduces a new API for Amazon Managed Blockchain Query: ListFilteredTransactionEvents.",
+    "type": "api-change"
+  }
+]
\ No newline at end of file
diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index 9f1884d37a..738b35ac47 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -2,6 +2,16 @@
 CHANGELOG
 =========
 
+1.34.66
+=======
+
+* api-change:``cloudformation``: [``botocore``] Documentation update, March 2024. Corrects some formatting.
+* api-change:``ec2``: [``botocore``] This release adds the new DescribeMacHosts API operation for getting information about EC2 Mac Dedicated Hosts. Users can now see the latest macOS versions that their underlying Apple Mac can support without needing to be updated.
+* api-change:``finspace``: [``botocore``] Adding new attributes readWrite and onDemand to dataview models for Database Maintenance operations.
+* api-change:``logs``: [``botocore``] Update LogSamples field in Anomaly model to be a list of LogEvent
+* api-change:``managedblockchain-query``: [``botocore``] Introduces a new API for Amazon Managed Blockchain Query: ListFilteredTransactionEvents.
+
+
 1.34.65
 =======
 
diff --git a/boto3/__init__.py b/boto3/__init__.py
index 259535a4ef..8a678b4131 100644
--- a/boto3/__init__.py
+++ b/boto3/__init__.py
@@ -17,7 +17,7 @@
 from boto3.session import Session
 
 __author__ = 'Amazon Web Services'
-__version__ = '1.34.65'
+__version__ = '1.34.66'
 
 
 # The default Boto3 session; autoloaded when needed.
diff --git a/setup.cfg b/setup.cfg
index dfeb459d6d..2f5a2fb5dc 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -3,7 +3,7 @@ universal = 0
 
 [metadata]
 requires_dist =
-    botocore>=1.34.65,<1.35.0
+    botocore>=1.34.66,<1.35.0
     jmespath>=0.7.1,<2.0.0
     s3transfer>=0.10.0,<0.11.0
 
diff --git a/setup.py b/setup.py
index 1a6d30a76c..8104bc55b2 100644
--- a/setup.py
+++ b/setup.py
@@ -13,7 +13,7 @@
 
 
 requires = [
-    'botocore>=1.34.65,<1.35.0',
+    'botocore>=1.34.66,<1.35.0',
     'jmespath>=0.7.1,<2.0.0',
     's3transfer>=0.10.0,<0.11.0',
 ]