diff --git a/packages/gatsby-theme-jamfire-conference/package.json b/packages/gatsby-theme-jamfire-conference/package.json
index b8db0646..4708c37c 100644
--- a/packages/gatsby-theme-jamfire-conference/package.json
+++ b/packages/gatsby-theme-jamfire-conference/package.json
@@ -84,7 +84,7 @@
     "react-switch": "^6.0.0",
     "react-typography": "^0.16.19",
     "react-youtube": "^7.13.1",
-    "sass": "^1.35.2",
+    "sass": "^1.66.1",
     "tinycolor2": "^1.4.2",
     "typeface-quattrocento-sans": "^1.1.13",
     "typeface-work-sans": "^1.1.13",
diff --git a/yarn.lock b/yarn.lock
index f171ff5f..0a9c1f1b 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -11469,6 +11469,11 @@ immutable@^3.7.6:
   resolved "https://registry.yarnpkg.com/immutable/-/immutable-3.8.2.tgz#c2439951455bb39913daf281376f1530e104adf3"
   integrity sha1-wkOZUUVbs5kT2vKBN28VMOEErfM=
 
+immutable@^4.0.0:
+  version "4.3.4"
+  resolved "https://registry.yarnpkg.com/immutable/-/immutable-4.3.4.tgz#2e07b33837b4bb7662f288c244d1ced1ef65a78f"
+  integrity sha512-fsXeu4J4i6WNWSikpI88v/PcVflZz+6kMhUfIwc5SY+poQRPnaf5V7qds6SUyUN3cVxEzuCab7QIoLOQ+DQ1wA==
+
 immutable@~3.7.6:
   version "3.7.6"
   resolved "https://registry.yarnpkg.com/immutable/-/immutable-3.7.6.tgz#13b4d3cb12befa15482a26fe1b2ebae640071e4b"
@@ -18462,12 +18467,14 @@ sass-loader@^10.1.1:
     schema-utils "^3.0.0"
     semver "^7.3.2"
 
-sass@^1.32.13, sass@^1.35.2:
-  version "1.43.4"
-  resolved "https://registry.yarnpkg.com/sass/-/sass-1.43.4.tgz#68c7d6a1b004bef49af0d9caf750e9b252105d1f"
-  integrity sha512-/ptG7KE9lxpGSYiXn7Ar+lKOv37xfWsZRtFYal2QHNigyVQDx685VFT/h7ejVr+R8w7H4tmUgtulsKl5YpveOg==
+sass@^1.32.13, sass@^1.66.1:
+  version "1.66.1"
+  resolved "https://registry.yarnpkg.com/sass/-/sass-1.66.1.tgz#04b51c4671e4650aa393740e66a4e58b44d055b1"
+  integrity sha512-50c+zTsZOJVgFfTgwwEzkjA3/QACgdNsKueWPyAR0mRINIvLAStVQBbPg14iuqEQ74NPDbXzJARJ/O4SI1zftA==
   dependencies:
     chokidar ">=3.0.0 <4.0.0"
+    immutable "^4.0.0"
+    source-map-js ">=0.6.2 <2.0.0"
 
 sax@>=0.6.0, sax@^1.2.4, sax@~1.2.4:
   version "1.2.4"
@@ -19095,6 +19102,11 @@ source-list-map@^2.0.0:
   resolved "https://registry.yarnpkg.com/source-list-map/-/source-list-map-2.0.1.tgz#3993bd873bfc48479cca9ea3a547835c7c154b34"
   integrity sha512-qnQ7gVMxGNxsiL4lEuJwe/To8UnK7fAnmbGEEH8RpLouuKbeEm0lhbQVFIrNSuB+G7tVrAlVsZgETT5nljf+Iw==
 
+"source-map-js@>=0.6.2 <2.0.0":
+  version "1.0.2"
+  resolved "https://registry.yarnpkg.com/source-map-js/-/source-map-js-1.0.2.tgz#adbc361d9c62df380125e7f161f71c826f1e490c"
+  integrity sha512-R0XvVJ9WusLiqTCEiGCmICCMplcCkIwwR11mOSD9CR5u+IXYdiseeEuXCVAjS54zqwkLcPNnmU4OeJ6tUrWhDw==
+
 source-map-js@^0.6.2:
   version "0.6.2"
   resolved "https://registry.yarnpkg.com/source-map-js/-/source-map-js-0.6.2.tgz#0bb5de631b41cfbda6cfba8bd05a80efdfd2385e"