diff --git a/Casks/camtwist-beta.rb b/Casks/camtwist-beta.rb
index 18684436b..bf0ba30cf 100644
--- a/Casks/camtwist-beta.rb
+++ b/Casks/camtwist-beta.rb
@@ -6,7 +6,7 @@ cask 'camtwist-beta' do
   name 'CamTwist'
   homepage 'http://camtwiststudio.com/'
 
-  depends_on macos: '>= 10.10'
+  depends_on macos: '>= :yosemite'
 
   pkg 'CamTwist.pkg'
 
diff --git a/Casks/sourcetree-alpha.rb b/Casks/sourcetree-alpha.rb
index 62304fb2b..8fe1e5f6d 100644
--- a/Casks/sourcetree-alpha.rb
+++ b/Casks/sourcetree-alpha.rb
@@ -10,7 +10,7 @@ cask 'sourcetree-alpha' do
   homepage 'https://www.sourcetreeapp.com/'
 
   auto_updates true
-  depends_on macos: '>= 10.10'
+  depends_on macos: '>= :yosemite'
 
   app 'SourceTree Alpha.app'
   binary "#{appdir}/SourceTree Alpha.app/Contents/Resources/stree"
diff --git a/Casks/sourcetree-beta.rb b/Casks/sourcetree-beta.rb
index 4596f26be..fbc99f783 100644
--- a/Casks/sourcetree-beta.rb
+++ b/Casks/sourcetree-beta.rb
@@ -10,7 +10,7 @@ cask 'sourcetree-beta' do
   homepage 'https://www.sourcetreeapp.com/'
 
   auto_updates true
-  depends_on macos: '>= 10.10'
+  depends_on macos: '>= :yosemite'
 
   app 'SourceTree-Beta.app'
   binary "#{appdir}/SourceTree-Beta.app/Contents/Resources/stree"