diff --git a/dev_tools/conf/mypy-next.ini b/dev_tools/conf/mypy-next.ini
index 06f19fedaef..481db6dc516 100644
--- a/dev_tools/conf/mypy-next.ini
+++ b/dev_tools/conf/mypy-next.ini
@@ -6,7 +6,7 @@ follow_imports = silent
 ignore_missing_imports = true
 
 # 3rd-party libs for which we don't have stubs
-[mypy-apiclient.*,freezegun.*,matplotlib.*,mpl_toolkits,multiprocessing.dummy,oauth2client.*,pandas.*,proto.*,pytest.*,scipy.*,sortedcontainers.*,setuptools.*,pylatex.*,networkx.*,qiskit.*,pypandoc.*,ply.*,_pytest.*,google.api.*,google.api_core.*,grpc.*,google.oauth2.*,google.protobuf.text_format.*,quimb.*,pyquil.*,google.cloud.*,filelock.*,codeowners.*,tqdm.*]
+[mypy-apiclient.*,freezegun.*,matplotlib.*,mpl_toolkits,multiprocessing.dummy,oauth2client.*,pandas.*,proto.*,pytest.*,scipy.*,sortedcontainers.*,setuptools.*,pylatex.*,networkx.*,qiskit.*,pypandoc.*,ply.*,_pytest.*,google.api.*,google.api_core.*,grpc.*,google.auth.*,google.oauth2.*,google.protobuf.text_format.*,quimb.*,pyquil.*,google.cloud.*,filelock.*,codeowners.*,tqdm.*,importlib_metadata.*,google.colab.*,IPython.*,astroid.*,pylint.*,qcs_api_client.*]
 follow_imports = silent
 ignore_missing_imports = true
 
@@ -15,8 +15,12 @@ ignore_missing_imports = true
 ignore_missing_imports = True
 
 # Treat symbols imported from Google's protobuf library as type Any.
-# This supresses errors due to attributes not known to typeshed,
+# This suppresses errors due to attributes not known to typeshed,
 # e.g. Descriptor._options.
 [mypy-google.protobuf.*]
 follow_imports = skip
 follow_imports_for_stubs = true
+
+# ruamel is a downstream dependency of cirq-rigetti through pyquil.
+[mypy-ruamel.*]
+ignore_missing_imports = true