diff --git a/appveyor.yml b/appveyor.yml
index 261e50f0..e69bb64e 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -8,9 +8,9 @@ environment:
     - PYTHON_VERSION: 3.5
       MINICONDA: C:\Miniconda35-x64
     - PYTHON_VERSION: 3.6
-      MINICONDA: C:\Miniconda36-x64
+      MINICONDA: C:\Miniconda38-x64
     - PYTHON_VERSION: 3.7
-      MINICONDA: C:\Miniconda37-x64
+      MINICONDA: C:\Miniconda38-x64
     - PYTHON_VERSION: 3.8
       MINICONDA: C:\Miniconda38-x64
     - PYTHON_VERSION: 3.9
@@ -23,7 +23,6 @@ environment:
 install:
  - "set PATH=%MINICONDA%;%MINICONDA%\\Scripts;%PATH%"
  - conda config --set always_yes yes --set changeps1 no
- - conda install charset-normalizer -f
  - conda update -q conda
  - conda info -a
  - "conda create -q -n build-environment python=%PYTHON_VERSION% numpy scipy matplotlib"