diff --git a/environment.yml b/environment.yml
index 2111edc..0753cdb 100644
--- a/environment.yml
+++ b/environment.yml
@@ -4,7 +4,7 @@ channels:
 dependencies:
 - python=3.9
 - requests
-- flask
+- flask==2.2.2
 - psutil
 - black
 - twine
@@ -14,5 +14,5 @@ dependencies:
 - pip:
   - pre_commit
   - flask-api
-  - werkzeug
+  - werkzeug==2.3.0
   - cellxgene
diff --git a/requirements.txt b/requirements.txt
index f5f698f..88e577e 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,6 +1,6 @@
 cellxgene
-flask
+flask==2.2.2
 flask-api
-werkzeug
+werkzeug==2.3.0
 psutil
 requests