diff --git a/.github/workflows/build.yaml b/.github/workflows/build.yaml
index 6790a25..b162ea3 100644
--- a/.github/workflows/build.yaml
+++ b/.github/workflows/build.yaml
@@ -25,4 +25,4 @@ jobs:
         run: nix develop --command make lintcheck
       - name: Build
         if: success() || failure()
-        run: nix build .
+        run: nix build .#all
diff --git a/flake.nix b/flake.nix
index 4ba5f51..49be1f8 100644
--- a/flake.nix
+++ b/flake.nix
@@ -95,6 +95,14 @@
           '';
           doCheck = false;
         };
+        # Mainly for building everything in CI.
+        all = pkgs.buildEnv {
+          name = "rose-all";
+          paths = [
+            rose-zig
+            rose-py
+          ];
+        };
       };
     });
 }
diff --git a/rose/ffi.py b/rose/ffi.py
index 86e38c5..0f84027 100644
--- a/rose/ffi.py
+++ b/rose/ffi.py
@@ -1,4 +1,3 @@
-# type: ignore
 from cffi import FFI
 
 ffi = FFI()
@@ -13,4 +12,4 @@
 
 
 def get_release() -> str:
-    return ffi.string(ffi.gc(lib.getRelease(), lib.free_str)).decode("utf-8")
+    return ffi.string(ffi.gc(lib.getRelease(), lib.free_str)).decode("utf-8")  # type: ignore