diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index e16629e7..a4610fad 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -17,14 +17,6 @@ jobs:
         requirements: ['-r requirements.txt']
         include:
           # historical requirements
-          - name: "Minimum install_requires versions"
-            requirements: numpy~=1.12.0 pandas~=0.24.0 SQLAlchemy~=1.2.19 psycopg2~=2.7.0 PyMySQL==1.0.2
-            pytest_flags: --ignore=siuba/dply/forcats.py siuba
-            python-version: 3.6
-          - name: "2019-late dependencies"
-            requirements: numpy==1.17.4 pandas==0.24.2 SQLAlchemy==1.2.19 psycopg2==2.8.4 PyMySQL==1.0.2
-            pytest_flags: --ignore=siuba/dply/forcats.py siuba
-            python-version: 3.6
           - name: "2020-early dependencies"
             requirements: numpy==1.17.4 pandas~=0.25.3 SQLAlchemy~=1.3.11 psycopg2~=2.8.4 PyMySQL==1.0.2
             pytest_flags: --ignore=siuba/dply/forcats.py siuba
@@ -39,7 +31,11 @@ jobs:
             latest: true
           - name: "2022-early dependencies"
             python-version: 3.8
-            requirements: numpy~=1.22.1 pandas~=1.3.0 SQLAlchemy~=1.4.29 psycopg2-binary~=2.9.3 PyMySQL==1.0.2
+            requirements: numpy~=1.22.0 pandas~=1.3.5 SQLAlchemy~=1.4.29 psycopg2-binary~=2.9.3 PyMySQL==1.0.2
+            latest: true
+          - name: "2022-early dependencies"
+            python-version: 3.10.1
+            requirements: numpy~=1.22.0 pandas~=1.3.5 SQLAlchemy~=1.4.29 psycopg2-binary~=2.9.3 PyMySQL==1.0.2
             latest: true
 
     steps:
diff --git a/requirements-dev.txt b/requirements-dev.txt
index c8db4e45..48a5f324 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -61,7 +61,7 @@ pytest==5.3.5
 python-dateutil==2.8.1
 pytz==2020.1
 PyYAML==5.3.1
-pyzmq==19.0.0
+pyzmq==22.3.0
 requests==2.24.0
 scipy==1.5.2
 six==1.14.0
diff --git a/requirements-test.txt b/requirements-test.txt
index 6f5d0100..e08925e9 100644
--- a/requirements-test.txt
+++ b/requirements-test.txt
@@ -13,8 +13,8 @@ jsonschema==3.2.0
 jupyter-client==6.0.0
 jupyter-core==4.6.3
 more-itertools==8.2.0
-nbformat==5.0.4
-nbval==0.9.5
+nbformat==5.1.3
+nbval==0.9.6
 packaging==20.3
 parso==0.6.2
 pexpect==4.8.0
@@ -22,13 +22,13 @@ pickleshare==0.7.5
 pluggy==0.13.1
 prompt-toolkit==3.0.3
 ptyprocess==0.6.0
-py==1.8.1
+py==1.11.0
 Pygments==2.5.2
 pyparsing==2.4.6
 pyrsistent==0.15.7
-pytest==5.3.5
+pytest==6.2.5
 python-dateutil==2.8.1
-pyzmq==19.0.0
+pyzmq==22.3.0
 six==1.14.0
 sortedcontainers==2.1.0
 tornado==6.0.4
diff --git a/siuba/meta_hook.py b/siuba/meta_hook.py
index f4fa607b..4d10a2f0 100644
--- a/siuba/meta_hook.py
+++ b/siuba/meta_hook.py
@@ -1,3 +1,10 @@
+"""
+DEPRECATED.
+
+Note that this module was experimental, and created very early in siuba's development.
+You should not rely on it for anything important.
+"""
+
 from importlib.abc import Loader, MetaPathFinder
 from importlib.machinery import ModuleSpec
 from importlib.util import find_spec
@@ -55,7 +62,8 @@ def exec_module(self, module):
         #self.orig_loader.exec_module(self.orig_module)
 
         #for k,v in self.orig_module.__dict__.items():
-        for k,v in self.orig_module.__dict__.items():
+        all_items = list(self.orig_module.__dict__.items())
+        for k,v in all_items:
             if k.startswith('_'):
                 module.__dict__[k] = v
             else: