diff --git a/env.yml b/env.yml
index d3a3cbc2..9a175067 100644
--- a/env.yml
+++ b/env.yml
@@ -49,6 +49,7 @@ dependencies:
   - sympy
   - tensorboard
   - pydantic <2  # because of lightning. See https://github.com/Lightning-AI/lightning/issues/18026 and https://github.com/Lightning-AI/lightning/pull/18022
+  - pytdc
 
   # Dev
   - pytest >=6.0
@@ -70,7 +71,13 @@ dependencies:
   - markdown-include
   - mike >=1.0.0
 
+  # C++ dependencies
+  - gcc_linux-64 # I find that I need to enforce `gcc_linux-64`, but that won't work with Mac, Windows, or Arm-Linux
+  - gxx_linux-64 # I find that I need to enforce `gxx_linux-64`, but that won't work with Mac, Windows, or Arm-Linux
+  - libgcc
+  - pybind11
+  - boost
+
   - pip:
-      - lightning-graphcore # optional, for using IPUs only
       - hydra-core>=1.3.2
-      - hydra-optuna-sweeper
+      # - hydra-optuna-sweeper  Optional