diff --git a/packages/bookwyrm/package.nix b/packages/bookwyrm/package.nix
index 8d01e91..20268dd 100644
--- a/packages/bookwyrm/package.nix
+++ b/packages/bookwyrm/package.nix
@@ -60,6 +60,7 @@ mkDerivation {
 			django-timezone-field
 			environs
 			frozenlist
+			grpcio
 			idna
 			importlib-metadata
 			jmespath
@@ -143,6 +144,8 @@ mkDerivation {
 
 		cp $src/VERSION $out/var/lib/bookwyrm/
 
+		wait  # Wait for async subprocesses to finish
+
 		runHook postInstall
 	'' ;
 }