diff --git a/appveyor.yml b/appveyor.yml
index a92d4c1..492b378 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -9,7 +9,7 @@ environment:
   VCVARS: C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Auxiliary\Build\vcvarsall.bat
   VCVARSARG: x64
   MINICONDA: C:\Miniconda3-x64
-  INNO: C:\Program Files (x86)\Inno Setup 5
+  INNO: C:\Program Files (x86)\Inno Setup 6
 
 build: off
 
@@ -29,6 +29,7 @@ install:
   - rustup-init -y --default-toolchain nightly --default-host x86_64-pc-windows-msvc
   - if defined VCVARS call "%VCVARS%" %VCVARSARG%
   - conda activate
+  - conda update -y -n base -c defaults conda
   - conda install -y -c conda-forge pycrypto nuitka
   - pip install PyQt5 setuptools_rust