diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index e68f1d3be1..d6a5e1f132 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -134,7 +134,7 @@ jobs:
       run: |
         set -ex
         cd contrib/webhook-teams-service
-        python -m pip install --upgrade pip isort black mypy flake8
+        python -m pip install --upgrade pip isort black mypy==0.910 flake8
         pip install -r requirements.txt
         mypy webhook
         black webhook --check
@@ -309,7 +309,7 @@ jobs:
         set -ex
         cd src/deployment
         python -m pip install --upgrade pip
-        pip install mypy isort black types-requests flake8
+        pip install mypy==0.910 isort black types-requests flake8
         mypy .
         isort --profile black . --check
         black . --check
diff --git a/src/api-service/requirements-dev.txt b/src/api-service/requirements-dev.txt
index d6156186ff..b5c28883be 100644
--- a/src/api-service/requirements-dev.txt
+++ b/src/api-service/requirements-dev.txt
@@ -1,6 +1,6 @@
 pytest
 flake8
-mypy
+mypy==0.910
 isort
 vulture
 black
diff --git a/src/cli/requirements-lint.txt b/src/cli/requirements-lint.txt
index 4b17da7322..d11da7b580 100644
--- a/src/cli/requirements-lint.txt
+++ b/src/cli/requirements-lint.txt
@@ -1,5 +1,5 @@
 flake8
-mypy
+mypy==0.910
 pytest
 isort
 vulture
diff --git a/src/pytypes/requirements-lint.txt b/src/pytypes/requirements-lint.txt
index 1ec96780f9..80d3fcaa72 100644
--- a/src/pytypes/requirements-lint.txt
+++ b/src/pytypes/requirements-lint.txt
@@ -1,5 +1,5 @@
 flake8
-mypy
+mypy==0.910
 pytest
 isort
 pydantic
diff --git a/src/utils/add-corpus-storage-accounts/requirements-lint.txt b/src/utils/add-corpus-storage-accounts/requirements-lint.txt
index 27a97b8b59..442907ea83 100644
--- a/src/utils/add-corpus-storage-accounts/requirements-lint.txt
+++ b/src/utils/add-corpus-storage-accounts/requirements-lint.txt
@@ -1,5 +1,5 @@
 flake8
-mypy
+mypy==0.910
 pytest
 isort
 vulture
diff --git a/src/utils/check-pr/requirements-lint.txt b/src/utils/check-pr/requirements-lint.txt
index 4b17da7322..d11da7b580 100644
--- a/src/utils/check-pr/requirements-lint.txt
+++ b/src/utils/check-pr/requirements-lint.txt
@@ -1,5 +1,5 @@
 flake8
-mypy
+mypy==0.910
 pytest
 isort
 vulture