diff --git a/requirements.dev.in b/requirements.dev.in
index 16ffd83..9478560 100644
--- a/requirements.dev.in
+++ b/requirements.dev.in
@@ -8,7 +8,7 @@ black
 httpretty
 pip-tools
 pre-commit
-virtualenv<20.36
+virtualenv<21.5
 pytest
 pytest-cov
 pytest-env
diff --git a/requirements.dev.txt b/requirements.dev.txt
index bf24404..8f11121 100644
--- a/requirements.dev.txt
+++ b/requirements.dev.txt
@@ -165,7 +165,9 @@ exceptiongroup==1.3.1 \
 filelock==3.19.1 \
     --hash=sha256:66eda1888b0171c998b35be2bcc0f6d75c388a7ce20c3f3f37aa8e96c2dddf58 \
     --hash=sha256:d38e30481def20772f5baf097c122c3babc4fcdb7e14e57049eb9d88c6dc017d
-    # via virtualenv
+    # via
+    #   python-discovery
+    #   virtualenv
 httpretty==1.1.4 \
     --hash=sha256:20de0e5dd5a18292d36d928cc3d6e52f8b2ac73daec40d41eb62dee154933b68
     # via -r requirements.dev.in
@@ -211,6 +213,7 @@ platformdirs==4.4.0 \
     # via
     #   -c requirements.prod.txt
     #   black
+    #   python-discovery
     #   virtualenv
 pluggy==1.6.0 \
     --hash=sha256:7dcc130b76258d33b90f61b658791dede3486c3e6bfb003ee5c9bfb396dd22f3 \
@@ -247,6 +250,10 @@ pytest-env==1.1.5 \
     --hash=sha256:91209840aa0e43385073ac464a554ad2947cc2fd663a9debf88d03b01e0cc1cf \
     --hash=sha256:ce90cf8772878515c24b31cd97c7fa1f4481cd68d588419fd45f10ecaee6bc30
     # via -r requirements.dev.in
+python-discovery==1.4.0 \
+    --hash=sha256:26ed78d703e234879a66244c7d4114563fb13ec5cd30a2d1357e5fb4850782da \
+    --hash=sha256:eb8bc7daad3c226c147e45bb4e970a1feb1bf4048ee178e6db59e197b8010ce3
+    # via virtualenv
 pytokens==0.4.1 \
     --hash=sha256:0fc71786e629cef478cbf29d7ea1923299181d0699dbe7c3c0f4a583811d9fc1 \
     --hash=sha256:11edda0942da80ff58c4408407616a310adecae1ddd22eef8c692fe266fa5009 \
@@ -449,9 +456,9 @@ typing-extensions==4.15.0 \
     #   black
     #   exceptiongroup
     #   virtualenv
-virtualenv==20.35.4 \
-    --hash=sha256:643d3914d73d3eeb0c552cbb12d7e82adf0e504dbf86a3182f8771a153a1971c \
-    --hash=sha256:c21c9cede36c9753eeade68ba7d523529f228a403463376cf821eaae2b650f1b
+virtualenv==21.4.2 \
+    --hash=sha256:38e6ee0a555615c0ea9da2ac7e9998fe8dc3b911dd33ad8eaad2020957653b0c \
+    --hash=sha256:854210ca524a1a4d0d744734f4acbc721c3ffe163b85bbf5d56d14d5ae2f0fae
     # via
     #   -r requirements.dev.in
     #   pre-commit