diff --git a/packages/frontend/ember-cli-build.js b/packages/frontend/ember-cli-build.js
index 33f0c85a30..1c96a05501 100644
--- a/packages/frontend/ember-cli-build.js
+++ b/packages/frontend/ember-cli-build.js
@@ -60,6 +60,9 @@ module.exports = async function (defaults) {
     minifyCSS: {
       enabled: false,
     },
+    sassOptions: {
+      silenceDeprecations: ['mixed-decls'],
+    },
   };
 
   const app = new EmberApp(defaults, config);
diff --git a/packages/lti-course-manager/ember-cli-build.js b/packages/lti-course-manager/ember-cli-build.js
index 54e47aa6f5..ef2eeb97c0 100644
--- a/packages/lti-course-manager/ember-cli-build.js
+++ b/packages/lti-course-manager/ember-cli-build.js
@@ -17,6 +17,9 @@ module.exports = async function (defaults) {
       enabled: true,
     },
     hinting: isTestBuild,
+    sassOptions: {
+      silenceDeprecations: ['mixed-decls'],
+    },
   };
   const app = new EmberApp(defaults, config);
 
diff --git a/packages/lti-dashboard/ember-cli-build.js b/packages/lti-dashboard/ember-cli-build.js
index 1348f32648..a8ce151af2 100644
--- a/packages/lti-dashboard/ember-cli-build.js
+++ b/packages/lti-dashboard/ember-cli-build.js
@@ -18,6 +18,9 @@ module.exports = async function (defaults) {
       enabled: true,
     },
     hinting: isTestBuild,
+    sassOptions: {
+      silenceDeprecations: ['mixed-decls'],
+    },
   };
   const app = new EmberApp(defaults, config);
 
diff --git a/packages/test-app/ember-cli-build.js b/packages/test-app/ember-cli-build.js
index 8bf0f6019e..7d9f138d9a 100644
--- a/packages/test-app/ember-cli-build.js
+++ b/packages/test-app/ember-cli-build.js
@@ -18,6 +18,9 @@ module.exports = async function (defaults) {
     autoImport: {
       watchDependencies: ['ilios-common'],
     },
+    sassOptions: {
+      silenceDeprecations: ['mixed-decls'],
+    },
     babel: {
       plugins: [
         require.resolve('ember-auto-import/babel-plugin'),