diff --git a/build-constraints.yaml b/build-constraints.yaml
index 7263af35..8eb09676 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -1141,6 +1141,15 @@ packages:
         - persistent-postgresql < 2.2
         - persistent-sqlite < 2.2
 
+        # https://github.com/vincenthz/cryptonite/issues/16
+        - tls < 1.3
+        - connection < 0.2.5
+        - tls-debug < 0.4
+        - x509 < 1.6.0
+        - x509-validation < 1.6.0
+        - x509-store < 1.6.0
+        - x509-system < 1.6.0
+
 # Package flags are applied to individual packages, and override the values of
 # global-flags
 package-flags: