diff --git a/.coveragerc b/.coveragerc
new file mode 100644
index 0000000..2c634d5
--- /dev/null
+++ b/.coveragerc
@@ -0,0 +1,8 @@
+[run]
+branch = true
+omit =
+    */__init__.py
+
+[report]
+show_missing = true
+fail_under = 90
\ No newline at end of file
diff --git a/.github/blunderbuss.yml b/.github/blunderbuss.yml
new file mode 100644
index 0000000..21e15f8
--- /dev/null
+++ b/.github/blunderbuss.yml
@@ -0,0 +1,4 @@
+assign_issues:
+  - googleapis/langchain-csql-mssql
+assign_prs:
+  - googleapis/langchain-csql-mssql
diff --git a/.github/header-checker-lint.yml b/.github/header-checker-lint.yml
index 53c9c5c..5a21e5f 100644
--- a/.github/header-checker-lint.yml
+++ b/.github/header-checker-lint.yml
@@ -11,6 +11,7 @@ sourceFileExtensions:
   - "py"
   - "text"
 ignoreFiles:
+  - ".github/blunderbuss.yml"
   - ".github/release-please.yml"
   - ".github/release-trigger.yml"
   - ".github/header-checker-lint.yml"
diff --git a/.kokoro/requirements.txt b/.kokoro/requirements.txt
index c2ce28d..ad774a6 100644
--- a/.kokoro/requirements.txt
+++ b/.kokoro/requirements.txt
@@ -273,10 +273,12 @@ jaraco-classes==3.3.1 \
 jeepney==0.8.0 \
     --hash=sha256:5efe48d255973902f6badc3ce55e2aa6c5c3b3bc642059ef3a91247bcfcc5806 \
     --hash=sha256:c0a454ad016ca575060802ee4d590dd912e35c122fa04e70306de3d076cce755
-    # via secretstorage
-jinja2==3.1.3 \
-    --hash=sha256:7d6d50dd97d52cbc355597bd845fabfbac3f551e1f99619e39a35ce8c370b5fa \
-    --hash=sha256:ac8bd6544d4bb2c9792bf3a159e80bba8fda7f07e81bc3aed565432d5925ba90
+    # via
+    #   keyring
+    #   secretstorage
+jinja2==3.1.4 \
+    --hash=sha256:4a3aee7acbbe7303aede8e9648d13b8bf88a429282aa6122a993f0ac800cb369 \
+    --hash=sha256:bc5dd2abb727a5319567b7a813e6a2e7318c39f4f487cfe6c89c6f9c7d25197d
     # via gcp-releasetool
 keyring==24.3.1 \
     --hash=sha256:c3327b6ffafc0e8befbdb597cacdb4928ffe5c1212f7645f186e6d9957a898db \
@@ -451,9 +453,9 @@ readme-renderer==42.0 \
     --hash=sha256:13d039515c1f24de668e2c93f2e877b9dbe6c6c32328b90a40a49d8b2b85f36d \
     --hash=sha256:2d55489f83be4992fe4454939d1a051c33edbab778e82761d060c9fc6b308cd1
     # via twine
-requests==2.31.0 \
-    --hash=sha256:58cd2187c01e70e6e26505bca751777aa9f2ee0b7f4300988b709f44e013003f \
-    --hash=sha256:942c5a758f98d790eaed1a29cb6eefc7ffb0d1cf7af05c3d2791656dbd6ad1e1
+requests==2.32.0 \
+    --hash=sha256:f2c3881dddb70d056c5bd7600a4fae312b2a300e39be6a118d30b90bd27262b5 \
+    --hash=sha256:fa5490319474c82ef1d2c9bc459d3652e3ae4ef4c4ebdd18a21145a47ca4b6b8
     # via
     #   gcp-releasetool
     #   google-api-core
@@ -479,7 +481,9 @@ rsa==4.9 \
 secretstorage==3.3.3 \
     --hash=sha256:2403533ef369eca6d2ba81718576c5e0f564d5cca1b58f73a8b23e7d4eeebd77 \
     --hash=sha256:f356e6628222568e3af06f2eba8df495efa13b3b63081dafd4f7d9a7b7bc9f99
-    # via -r requirements.in
+    # via
+    #   -r requirements.in
+    #   keyring
 six==1.16.0 \
     --hash=sha256:1e61c37477a1626458e36f7b1d82aa5c9b094fa4802892072e49de9c60c4c926 \
     --hash=sha256:8abb2f1d86890a2dfb989f9a77cfcfd3e47c2a354b01111771326f8aa26e0254
@@ -498,9 +502,9 @@ typing-extensions==4.10.0 \
     --hash=sha256:69b1a937c3a517342112fb4c6df7e72fc39a38e7891a5730ed4985b5214b5475 \
     --hash=sha256:b0abd7c89e8fb96f98db18d86106ff1d90ab692004eb746cf6eda2682f91b3cb
     # via -r requirements.in
-urllib3==2.2.1 \
-    --hash=sha256:450b20ec296a467077128bff42b73080516e71b56ff59a60a02bef2232c4fa9d \
-    --hash=sha256:d0570876c61ab9e520d776c38acbbb5b05a776d3f9ff98a5c8fd5162a444cf19
+urllib3==2.2.2 \
+    --hash=sha256:a448b2f64d686155468037e1ace9f2d2199776e17f0a46610480d311f73e3472 \
+    --hash=sha256:dd505485549a7a552833da5e6063639d0d177c04f23bc3864e41e5dc5f612168
     # via
     #   requests
     #   twine
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 20ba473..b89ee48 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,12 @@
 # Changelog
 
+## [0.2.1](https://github.com/googleapis/langchain-google-cloud-sql-mssql-python/compare/v0.2.0...v0.2.1) (2024-06-26)
+
+
+### Bug Fixes
+
+* Use lazy refresh for Cloud SQL Connector ([#55](https://github.com/googleapis/langchain-google-cloud-sql-mssql-python/issues/55)) ([0c29445](https://github.com/googleapis/langchain-google-cloud-sql-mssql-python/commit/0c29445be6680cd45b4c796a1f3254552131f15c))
+
 ## [0.2.0](https://github.com/googleapis/langchain-google-cloud-sql-mssql-python/compare/v0.1.0...v0.2.0) (2024-05-01)
 
 
diff --git a/DEVELOPER.md b/DEVELOPER.md
index cc958c3..c1d95df 100644
--- a/DEVELOPER.md
+++ b/DEVELOPER.md
@@ -58,7 +58,7 @@ substitutions:
   _VERSION: "3.8"
 ```
 
-Use `gcloud builds triggers import --source=trigger.yaml` create triggers via the command line
+Use `gcloud builds triggers import --source=trigger.yaml` to create triggers via the command line
 
 #### Project Setup
 
@@ -77,5 +77,17 @@ Use `gcloud builds triggers import --source=trigger.yaml` create triggers via th
 
 To run Cloud Build tests on GitHub from external contributors, ie RenovateBot, comment: `/gcbrun`.
 
+#### Code Coverage
+Please make sure your code is fully tested. The Cloud Build integration tests are run with the `pytest-cov` code coverage plugin. They fail for PRs with a code coverage less than the threshold specified in `.coveragerc`.  If your file is inside the main module and should be ignored by code coverage check, add it to the `omit` section of `.coveragerc`.
+
+Check for code coverage report in any Cloud Build integration test log. 
+Here is a breakdown of the report:
+- `Stmts`:  lines of executable code (statements).
+- `Miss`: number of lines not covered by tests.
+- `Branch`: branches of executable code (e.g an if-else clause may count as 1 statement but 2 branches; test for both conditions to have both branches covered).
+- `BrPart`: number of branches not covered by tests.
+- `Cover`: average coverage of files.
+- `Missing`: lines that are not covered by tests.
+
 
 [triggers]: https://console.cloud.google.com/cloud-build/triggers?e=13802955&project=langchain-cloud-sql-testing
\ No newline at end of file
diff --git a/integration.cloudbuild.yaml b/integration.cloudbuild.yaml
index 8f37d32..a46e34d 100644
--- a/integration.cloudbuild.yaml
+++ b/integration.cloudbuild.yaml
@@ -26,7 +26,7 @@ steps:
   - id: Run integration tests
     name: python:${_VERSION}
     entrypoint: python
-    args: ["-m", "pytest"]
+    args: ["-m", "pytest", "--cov=langchain_google_cloud_sql_mssql", "--cov-config=.coveragerc", "tests/"]
     env:
       - "PROJECT_ID=$PROJECT_ID"
       - "INSTANCE_ID=$_INSTANCE_ID"
diff --git a/pyproject.toml b/pyproject.toml
index 505384b..88420b7 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -13,7 +13,7 @@ dependencies = [
     "langchain-community>=0.0.18, <1.0.0",
     "SQLAlchemy>=2.0.7, <3.0.0",
     "sqlalchemy-pytds>=1.0.0, <2.0.0",
-    "cloud-sql-python-connector[pytds]>=1.7.0, <2.0.0"
+    "cloud-sql-python-connector[pytds]>=1.10.0, <2.0.0"
 ]
 classifiers = [
     "Intended Audience :: Developers",
@@ -40,10 +40,11 @@ Changelog = "https://github.com/googleapis/langchain-google-cloud-sql-mssql-pyth
 test = [
     "black[jupyter]==23.12.1",
     "isort==5.13.2",
-    "langchain==0.1.12",
-    "mypy==1.9.0",
-    "pytest-asyncio==0.23.5.post1",
-    "pytest==7.4.4"
+    "langchain==0.2.5",
+    "mypy==1.10.0",
+    "pytest-asyncio==0.23.7",
+    "pytest==7.4.4",
+    "pytest-cov==5.0.0"
 ]
 
 [build-system]
@@ -56,6 +57,7 @@ profile = "black"
 [tool.mypy]
 python_version = "3.11"
 warn_unused_configs = true
+disallow_incomplete_defs = true
 
 exclude = [
     'docs/*',
diff --git a/requirements.txt b/requirements.txt
index 8fb218d..0ad100d 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,5 +1,5 @@
-langchain-core==0.1.35
-langchain-community==0.0.28
-SQLAlchemy==2.0.28
+langchain-core==0.2.7
+langchain-community==0.2.5
+SQLAlchemy==2.0.30
 sqlalchemy-pytds==1.0.0
-cloud-sql-python-connector[pytds]==1.8.0
+cloud-sql-python-connector[pytds]==1.10.0
diff --git a/src/langchain_google_cloud_sql_mssql/engine.py b/src/langchain_google_cloud_sql_mssql/engine.py
index 875d9eb..1dc7feb 100644
--- a/src/langchain_google_cloud_sql_mssql/engine.py
+++ b/src/langchain_google_cloud_sql_mssql/engine.py
@@ -18,7 +18,7 @@
 from typing import List, Optional
 
 import sqlalchemy
-from google.cloud.sql.connector import Connector
+from google.cloud.sql.connector import Connector, RefreshStrategy
 
 from .version import __version__
 
@@ -96,7 +96,9 @@ def _create_connector_engine(
                 Python Connector.
         """
         if cls._connector is None:
-            cls._connector = Connector(user_agent=USER_AGENT)
+            cls._connector = Connector(
+                user_agent=USER_AGENT, refresh_strategy=RefreshStrategy.LAZY
+            )
 
         # anonymous function to be used for SQLAlchemy 'creator' argument
         def getconn():
diff --git a/src/langchain_google_cloud_sql_mssql/version.py b/src/langchain_google_cloud_sql_mssql/version.py
index 20c5861..fffa9d9 100644
--- a/src/langchain_google_cloud_sql_mssql/version.py
+++ b/src/langchain_google_cloud_sql_mssql/version.py
@@ -12,4 +12,4 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-__version__ = "0.2.0"
+__version__ = "0.2.1"