diff --git a/templates b/templates
index 7796077..c4e5bad 100644
--- a/templates
+++ b/templates
@@ -208,6 +208,10 @@ envrc-file-mode
 (python "CC=\"$(nix build nixpkgs#stdenv.cc.cc.lib --print-out-paths --no-link)\"" n
         "ZLIB=\"$(nix build nixpkgs#zlib --print-out-paths --no-link)\"" n
         "export LD_LIBRARY_PATH=\"$CC/lib\":\"$ZLIB/lib\"" n
+        "VENV_DIR=.venv/" n
+        "if [ ! -f $VENV_DIR/bin/python3 ]; then" n
+        > "nix run nixpkgs#python3 -- -m venv $VENV_DIR" n
+        "fi" n
         "source .venv/bin/activate")
 
 ;; Local Variables: