diff --git a/environment-dev.yml b/environment-dev.yml
index c8df9c08..4e2879c7 100644
--- a/environment-dev.yml
+++ b/environment-dev.yml
@@ -5,7 +5,7 @@ dependencies:
   # Build dependencies
   - make
   - cmake
-  - sel(unix): clangxx=21
+  - sel(unix): clangxx=21.1.8=*5
   - sel(win): cxx-compiler
   - sel(linux): cxx-compiler
   # Host dependencies
@@ -20,6 +20,7 @@ dependencies:
   - curl
   - libcurl
   - libcurl-static
+  - python=3.14.6
   # Test dependencies
   - pytest
   - jupyter_kernel_test<0.8