diff --git a/.circleci/unittest/linux/scripts/environment.yml b/.circleci/unittest/linux/scripts/environment.yml
index 9400308196..c611925aeb 100644
--- a/.circleci/unittest/linux/scripts/environment.yml
+++ b/.circleci/unittest/linux/scripts/environment.yml
@@ -15,5 +15,6 @@ dependencies:
       - spacy
       - tqdm
       - expecttest
+      - regex
       - https://github.com/explosion/spacy-models/releases/download/de_core_news_sm-3.0.0/de_core_news_sm-3.0.0.tar.gz#egg=de_core_news_sm==3.0.0
       - https://github.com/explosion/spacy-models/releases/download/en_core_web_sm-3.0.0/en_core_web_sm-3.0.0.tar.gz#egg=en_core_web_sm==3.0.0
diff --git a/.circleci/unittest/windows/scripts/environment.yml b/.circleci/unittest/windows/scripts/environment.yml
index b86ded6ada..5ea896891b 100644
--- a/.circleci/unittest/windows/scripts/environment.yml
+++ b/.circleci/unittest/windows/scripts/environment.yml
@@ -17,5 +17,6 @@ dependencies:
       - tqdm
       - certifi
       - expecttest
+      - regex
       - https://github.com/explosion/spacy-models/releases/download/de_core_news_sm-3.0.0/de_core_news_sm-3.0.0.tar.gz#egg=de_core_news_sm==3.0.0
       - https://github.com/explosion/spacy-models/releases/download/en_core_web_sm-3.0.0/en_core_web_sm-3.0.0.tar.gz#egg=en_core_web_sm==3.0.0
diff --git a/setup.py b/setup.py
index d8afa7a550..4c8ccecc1c 100644
--- a/setup.py
+++ b/setup.py
@@ -100,7 +100,7 @@ def run(self):
     description="Text utilities and datasets for PyTorch",
     long_description=read("README.rst"),
     license="BSD",
-    install_requires=["tqdm", "requests", pytorch_package_dep, "numpy"],
+    install_requires=["tqdm", "requests", pytorch_package_dep, "numpy", "regex"],
     python_requires=">=3.7",
     classifiers=[
         "Programming Language :: Python :: 3.7",