diff --git a/build/conda/conda-3-9-env-full.yaml b/build/conda/conda-3-9-env-full.yaml
index 33392f4c800..65e559f63a6 100644
--- a/build/conda/conda-3-9-env-full.yaml
+++ b/build/conda/conda-3-9-env-full.yaml
@@ -6,3 +6,4 @@ dependencies:
   - pip
   - poetry=1.1.13
   - lightgbm=3.3.3
+  - charset-normalizer=2.1.1