diff --git a/composer/blog/gcp-tech-blog/unit-test-dags-cloud-build/constraints.txt b/composer/blog/gcp-tech-blog/unit-test-dags-cloud-build/constraints.txt
new file mode 100644
index 00000000000..5784f524232
--- /dev/null
+++ b/composer/blog/gcp-tech-blog/unit-test-dags-cloud-build/constraints.txt
@@ -0,0 +1 @@
+SQLAlchemy==1.3.23 # must be under 1.4 until at least Airflow 2.0 (check airflow setup.py for restrictions)
diff --git a/composer/blog/gcp-tech-blog/unit-test-dags-cloud-build/requirements.txt b/composer/blog/gcp-tech-blog/unit-test-dags-cloud-build/requirements.txt
index 21322637097..689304bfbbd 100644
--- a/composer/blog/gcp-tech-blog/unit-test-dags-cloud-build/requirements.txt
+++ b/composer/blog/gcp-tech-blog/unit-test-dags-cloud-build/requirements.txt
@@ -1,3 +1,2 @@
 apache-airflow[gcp]==1.10.14
-SQLAlchemy==1.3.23 # must be under 1.4 until at least Airflow 2.0 (check airflow setup.py for restrictions)
 apache-airflow-backport-providers-google==2021.3.3
diff --git a/composer/workflows/constraints.txt b/composer/workflows/constraints.txt
new file mode 100644
index 00000000000..ca0e831ad6a
--- /dev/null
+++ b/composer/workflows/constraints.txt
@@ -0,0 +1,2 @@
+pandas-gbq==0.14.1 # must be under 0.15.0 until https://github.com/apache/airflow/issues/15113 is addressed
+SQLAlchemy==1.3.23 # must be under 1.4 until at least Airflow 2.0 (check airflow setup.py for restrictions)
diff --git a/composer/workflows/requirements.txt b/composer/workflows/requirements.txt
index 1339996914b..1d8d02bd845 100644
--- a/composer/workflows/requirements.txt
+++ b/composer/workflows/requirements.txt
@@ -1,5 +1,4 @@
 apache-airflow[gcp]==1.10.14
-SQLAlchemy==1.3.23 # must be under 1.4 until at least Airflow 2.0 (check airflow setup.py for restrictions)
 kubernetes==12.0.1
 scipy==1.4.1; python_version > '3.0'
 scipy==1.2.3; python_version < '3.0'
diff --git a/noxfile-template.py b/noxfile-template.py
index 8d8d188229a..cdd2812a24c 100644
--- a/noxfile-template.py
+++ b/noxfile-template.py
@@ -175,14 +175,16 @@ def blacken(session: nox.sessions.Session) -> None:
 def _session_tests(session: nox.sessions.Session, post_install: Callable = None) -> None:
     """Runs py.test for a particular project."""
     if os.path.exists("requirements.txt"):
-      if os.path.exists("constraints.txt"):
-        session.install("-r", "requirements.txt", "-c", "constraints.txt")
-      session.install("-r", "requirements.txt")
+        if os.path.exists("constraints.txt"):
+            session.install("-r", "requirements.txt", "-c", "constraints.txt")
+        else:
+            session.install("-r", "requirements.txt")
 
     if os.path.exists("requirements-test.txt"):
-      if os.path.exists("constraints-test.txt"):
-        session.install("-r", "requirements-test.txt", "-c", "constraints-test.txt")
-      session.install("-r", "requirements-test.txt")
+        if os.path.exists("constraints-test.txt"):
+            session.install("-r", "requirements-test.txt", "-c", "constraints-test.txt")
+        else:
+            session.install("-r", "requirements-test.txt")
 
     if INSTALL_LIBRARY_FROM_SOURCE:
         session.install("-e", _get_repo_root())