diff --git a/pkgs/development/beam-modules/mix-release.nix b/pkgs/development/beam-modules/mix-release.nix
index a72ba6c8e9ae..9a60c0858690 100644
--- a/pkgs/development/beam-modules/mix-release.nix
+++ b/pkgs/development/beam-modules/mix-release.nix
@@ -167,9 +167,12 @@ stdenv.mkDerivation (
         export MIX_DEPS_PATH="$TEMPDIR/deps"
         cp --no-preserve=mode -R "${mixFodDeps}" "$MIX_DEPS_PATH"
 
-        if [ -f "$MIX_DEPS_PATH/castore/priv/cacerts.pem" ]; then
-          cp "${cacert}/etc/ssl/certs/ca-bundle.crt" "$MIX_DEPS_PATH/castore/priv/cacerts.pem"
-        fi
+        local dep
+        for dep in castore certifi; do
+          if [ -f "$MIX_DEPS_PATH/$dep/priv/cacerts.pem" ]; then
+            cp "${cacert}/etc/ssl/certs/ca-bundle.crt"  "$MIX_DEPS_PATH/$dep/priv/cacerts.pem"
+          fi
+        done
       ''}
     ''
     + (attrs.postUnpack or "");