diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index bb55131..2690a6f 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -24,10 +24,9 @@ jobs:
       run: |
         pip install .
         pip install mypy pytest
-        mypy --install-types --non-interactive
     - name: Check types
       run: |
-        mypy --ignore-missing-imports jetforce/
+        mypy --ignore-missing-imports --install-types --non-interactive jetforce/
     - name: Run tests
       run: |
         pytest -v tests/
diff --git a/jetforce/tls.py b/jetforce/tls.py
index 5cf8312..e9f7a44 100644
--- a/jetforce/tls.py
+++ b/jetforce/tls.py
@@ -4,7 +4,8 @@ import os
 import tempfile
 import typing
 
-import OpenSSL
+import OpenSSL.crypto
+import OpenSSL.SSL
 from cryptography import x509
 from cryptography.hazmat.backends import default_backend
 from cryptography.hazmat.primitives import hashes, serialization
@@ -120,9 +121,9 @@ class GeminiCertificateOptions(CertificateOptions):
         mark the certificate as not trusted.
         """
         if not hasattr(conn, "authorised"):
-            conn.authorised = preverify_ok
+            conn.authorised = preverify_ok  # type: ignore
         else:
-            conn.authorised *= preverify_ok
+            conn.authorised *= preverify_ok  # type: ignore
 
         return True