diff --git a/readthedocs/api/v3/serializers.py b/readthedocs/api/v3/serializers.py
index b854839f2c9..12004ef2bf4 100644
--- a/readthedocs/api/v3/serializers.py
+++ b/readthedocs/api/v3/serializers.py
@@ -173,7 +173,7 @@ class Meta:
         ]
 
         expandable_fields = {
-            'config': (BuildConfigSerializer, {'source': 'config'})
+            'config': (BuildConfigSerializer,)
         }
 
     def get_finished(self, obj):
@@ -275,7 +275,7 @@ class Meta:
 
         expandable_fields = {
             'last_build': (
-                BuildSerializer, {'source': 'last_build'}
+                BuildSerializer,
             )
         }
 
@@ -569,12 +569,11 @@ class Meta:
         ]
 
         expandable_fields = {
+            # NOTE: this has to be a Model method, can't be a
+            # ``SerializerMethodField`` as far as I know
             'active_versions': (
                 VersionSerializer,
                 {
-                    # NOTE: this has to be a Model method, can't be a
-                    # ``SerializerMethodField`` as far as I know
-                    'source': 'active_versions',
                     'many': True,
                 }
             )
@@ -954,7 +953,7 @@ class Meta:
                 RemoteOrganizationSerializer, {'source': 'organization'}
             ),
             'projects': (
-                ProjectSerializer, {'source': 'projects', 'many': True}
+                ProjectSerializer, {'many': True}
             )
         }
 
diff --git a/requirements/deploy.txt b/requirements/deploy.txt
index 7f2cbda6458..dcf880900f6 100644
--- a/requirements/deploy.txt
+++ b/requirements/deploy.txt
@@ -1,7 +1,7 @@
 # Requirements for our production systems
 
 -r pip.txt
-psycopg2==2.8.6
+psycopg2==2.9.1
 gunicorn==20.1.0
 
 # Version 3.0.0 drops support for Django < 3.0
diff --git a/requirements/docker.txt b/requirements/docker.txt
index 67306a08651..b342a0b8040 100644
--- a/requirements/docker.txt
+++ b/requirements/docker.txt
@@ -2,7 +2,7 @@
 
 -r pip.txt
 # https://www.psycopg.org/docs/install.html#psycopg-vs-psycopg-binary
-psycopg2-binary==2.8.6
+psycopg2-binary==2.9.1
 
 # Version 3.0.0 drops support for Django < 3.0
 # https://github.com/sebleier/django-redis-cache/#300
@@ -12,7 +12,7 @@ django-redis-cache==2.1.3  # pyup: ignore
 pillow==8.2.0
 
 # local debugging tools
-watchdog==2.1.2
+watchdog==2.1.3
 datadiff==2.0.0
 ipdb==0.13.9
 pdbpp==0.10.2
diff --git a/requirements/pip.txt b/requirements/pip.txt
index e8203c590b4..1eae81827db 100644
--- a/requirements/pip.txt
+++ b/requirements/pip.txt
@@ -1,6 +1,6 @@
 # Base packages
 
-pip==21.1.2
+pip==21.1.3
 virtualenv==20.4.7
 
 django==2.2.24  # pyup: <2.3
@@ -16,7 +16,7 @@ Sphinx==4.0.2
 # Filtering for the REST API
 django-filter==2.4.0
 
-drf-flex-fields==0.9.0
+drf-flex-fields==0.9.1
 drf-extensions==0.7.0
 
 django-vanilla-views==3.0.0
@@ -31,7 +31,7 @@ Pygments==2.9.0
 # Basic tools
 redis==3.5.3
 kombu==5.1.0
-celery==5.1.0
+celery==5.1.2
 
 # When upgrading to 0.43.0 we should double check the ``base.html`` change
 # described in the changelog. In previous versions, the allauth app included a
@@ -41,13 +41,13 @@ celery==5.1.0
 # override ``account/base.html`` within your project.
 django-allauth==0.42.0  # pyup: ignore
 
-GitPython==3.1.17
+GitPython==3.1.18
 
 # Search
-elasticsearch==7.13.1  # pyup: <8.0.0
+elasticsearch==7.13.2  # pyup: <8.0.0
 elasticsearch-dsl==7.3.0  # pyup: <8.0
 django-elasticsearch-dsl==7.2.0  # pyup: <8.0
-selectolax==0.2.11
+selectolax==0.2.12
 
 # embed
 pyquery==1.4.3
diff --git a/requirements/testing.txt b/requirements/testing.txt
index 88dffff63cb..01e301c7b0c 100644
--- a/requirements/testing.txt
+++ b/requirements/testing.txt
@@ -6,7 +6,7 @@ django-dynamic-fixture==3.1.1
 pytest==6.2.4
 pytest-custom-exit-code==0.3.0
 pytest-django==4.4.0
-pytest-xdist==2.2.1
+pytest-xdist==2.3.0
 pytest-cov==2.12.1
 apipkg==1.5
 execnet==1.9.0