diff --git a/.circleci/config.yml b/.circleci/config.yml
index 3387670b..abe6141c 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -97,8 +97,17 @@ jobs:
       - run:
           name: Install cygwin and required packages
           command: |
-            Invoke-WebRequest -Uri https://cygwin.com/setup-x86_64.exe -OutFile C:\Users\circleci\Downloads\setup-x86_64.exe
-            C:\Users\circleci\Downloads\setup-x86_64.exe -q -s https://mirrors.kernel.org/sourceware/cygwin/ -P libssl-devel,git,gcc-core,make,autoconf,automake,libtool,clang,perl
+            # Download cygwin installer, signature, and signing key
+            Invoke-WebRequest -Uri https://cygwin.com/setup-x86_64.exe -OutFile .\Downloads\setup-x86_64.exe
+            Invoke-WebRequest -Uri https://cygwin.com/setup-x86_64.exe.sig -OutFile .\Downloads\setup-x86_64.exe.sig
+            Invoke-WebRequest -Uri https://cygwin.com/key/pubring.asc -OutFile .\Downloads\pubring.asc
+            # Verify signature
+            gpg --import .\Downloads\pubring.asc
+            gpg --verify .\Downloads\setup-x86_64.exe.sig .\Downloads\setup-x86_64.exe
+            if($? -ne $true) { throw "cygwin failed to verify" }
+            # Install cygwin and required packaged
+            .\Downloads\setup-x86_64.exe -q -s https://mirrors.kernel.org/sourceware/cygwin/ -P libssl-devel,git,gcc-core,make,autoconf,automake,libtool,clang,perl
+            # Create folders
             mkdir C:\Users\circleci\src
             mkdir C:\Users\circleci\build