diff --git a/shell.nix b/shell.nix
index af1976a..867b061 100644
--- a/shell.nix
+++ b/shell.nix
@@ -4,7 +4,6 @@ let
   sbcl' = sbcl.withPackages (ps: with ps; [
     hunchentoot
     dexador
-    clack
     jzon
     serapeum
     deploy
@@ -25,6 +24,9 @@ in mkShell rec {
     gdb
     pkg-config
     makeWrapper
+    openssl
+    openssl.out
+    openssl.dev
   ];
 
   buildInputs = [