diff --git a/devenv.nix b/devenv.nix
index 38b49cf..0ed8dd0 100644
--- a/devenv.nix
+++ b/devenv.nix
@@ -10,7 +10,7 @@
   # env.GREET = "devenv";
 
   # https://devenv.sh/packages/
-  packages = [ pkgs.file ];
+  packages = [ pkgs.file pkgs.swig4 pkgs.openssl ];
 
   # https://devenv.sh/scripts/
   # scripts.hello.exec = "echo hello from $GREET";
diff --git a/requirements.txt b/requirements.txt
index 3137f30..6316984 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,3 +1,5 @@
 aiosmtpd
 aiosmtplib
 envelope
+M2Crypto
+cryptography
\ No newline at end of file