diff --git a/packages/@opticss/attr-analysis-dsl/package.json b/packages/@opticss/attr-analysis-dsl/package.json
index 64bb7524..a157c4e1 100644
--- a/packages/@opticss/attr-analysis-dsl/package.json
+++ b/packages/@opticss/attr-analysis-dsl/package.json
@@ -47,7 +47,7 @@
     "@opticss/code-style": "^0.6.0",
     "@opticss/element-analysis": "^0.6.2",
     "@types/chai": "^4.0.4",
-    "@types/mocha": "^5.2.6",
+    "@types/mocha": "^7.0.0",
     "@types/nearley": "^2.9.0",
     "chai": "^4.1.2",
     "istanbul": "^0.4.5",
diff --git a/packages/@opticss/element-analysis/package.json b/packages/@opticss/element-analysis/package.json
index 91335a00..89f63ac3 100644
--- a/packages/@opticss/element-analysis/package.json
+++ b/packages/@opticss/element-analysis/package.json
@@ -43,7 +43,7 @@
   "devDependencies": {
     "@opticss/code-style": "^0.6.0",
     "@types/chai": "^4.0.4",
-    "@types/mocha": "^5.2.6",
+    "@types/mocha": "^7.0.0",
     "chai": "^4.1.2",
     "istanbul": "^0.4.5",
     "mocha": "^6.1.4",
diff --git a/packages/@opticss/simple-template/package.json b/packages/@opticss/simple-template/package.json
index 1fb85097..779d4e71 100644
--- a/packages/@opticss/simple-template/package.json
+++ b/packages/@opticss/simple-template/package.json
@@ -52,7 +52,7 @@
   "devDependencies": {
     "@opticss/code-style": "^0.6.0",
     "@types/chai": "^4.0.4",
-    "@types/mocha": "^5.2.6",
+    "@types/mocha": "^7.0.0",
     "@types/parse5": "^5.0.0",
     "@types/parse5-sax-parser": "^5.0.1",
     "chai": "^4.1.2",
diff --git a/packages/@opticss/template-api/package.json b/packages/@opticss/template-api/package.json
index e657835d..0476e542 100644
--- a/packages/@opticss/template-api/package.json
+++ b/packages/@opticss/template-api/package.json
@@ -49,7 +49,7 @@
     "@opticss/attr-analysis-dsl": "^0.6.3",
     "@opticss/code-style": "^0.6.0",
     "@types/chai": "^4.0.4",
-    "@types/mocha": "^5.2.6",
+    "@types/mocha": "^7.0.0",
     "chai": "^4.1.2",
     "istanbul": "^0.4.5",
     "mocha": "^6.1.4",
diff --git a/packages/@opticss/util/package.json b/packages/@opticss/util/package.json
index aa035b6d..750a714f 100644
--- a/packages/@opticss/util/package.json
+++ b/packages/@opticss/util/package.json
@@ -47,7 +47,7 @@
   "devDependencies": {
     "@opticss/code-style": "^0.6.0",
     "@types/chai": "^4.0.4",
-    "@types/mocha": "^5.2.6",
+    "@types/mocha": "^7.0.0",
     "chai": "^4.1.2",
     "istanbul": "^0.4.5",
     "mocha": "^6.1.4",
diff --git a/packages/opticss/package.json b/packages/opticss/package.json
index 6b4e329b..222514e2 100644
--- a/packages/opticss/package.json
+++ b/packages/opticss/package.json
@@ -59,7 +59,7 @@
     "@opticss/code-style": "^0.6.0",
     "@opticss/simple-template": "^0.6.3",
     "@types/chai": "^4.0.4",
-    "@types/mocha": "^5.2.6",
+    "@types/mocha": "^7.0.0",
     "@types/node": "^11.13.8",
     "@types/random-js": "^1.0.30",
     "chai": "^4.1.2",
diff --git a/packages/resolve-cascade/package.json b/packages/resolve-cascade/package.json
index 72e6d961..82e9a510 100644
--- a/packages/resolve-cascade/package.json
+++ b/packages/resolve-cascade/package.json
@@ -40,7 +40,7 @@
   "devDependencies": {
     "@opticss/code-style": "^0.6.0",
     "@types/chai": "^4.0.4",
-    "@types/mocha": "^5.2.6",
+    "@types/mocha": "^7.0.0",
     "@types/node": "^11.13.8",
     "@types/parse5": "^5.0.0",
     "chai": "^4.1.2",
diff --git a/yarn.lock b/yarn.lock
index c772a8fb..3afdb46b 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -900,11 +900,16 @@
   dependencies:
     "@types/node" "*"
 
-"@types/mocha@^5.2.0", "@types/mocha@^5.2.6":
+"@types/mocha@^5.2.0":
   version "5.2.7"
   resolved "https://registry.yarnpkg.com/@types/mocha/-/mocha-5.2.7.tgz#315d570ccb56c53452ff8638738df60726d5b6ea"
   integrity sha512-NYrtPht0wGzhwe9+/idPaBB+TqkY9AhTvOLMkThm0IoEfLaiVQZwBwyJ5puCkO3AUCWrmcoePjp2mbFocKy4SQ==
 
+"@types/mocha@^7.0.0":
+  version "7.0.0"
+  resolved "https://registry.yarnpkg.com/@types/mocha/-/mocha-7.0.0.tgz#ac65f97746464ec84ce15f4743cd61c449822ad4"
+  integrity sha512-6mh1VlA343Ax31blo37+KZ0DxDOA8b6cL963xPOOt7fMYtG07aJJ+0FRLvcDO4KrL45faOS104G7kwAjZc9l4w==
+
 "@types/nearley@^2.9.0":
   version "2.11.0"
   resolved "https://registry.yarnpkg.com/@types/nearley/-/nearley-2.11.0.tgz#308fd197fdd6d76c52c4ca6f5bb8f42073afa91b"
@@ -7407,10 +7412,10 @@ preserve@^0.2.0:
   resolved "https://registry.yarnpkg.com/preserve/-/preserve-0.2.0.tgz#815ed1f6ebc65926f865b310c0713bcb3315ce4b"
   integrity sha1-gV7R9uvGWSb4ZbMQwHE7yzMVzks=
 
-prettier@1.17.0:
-  version "1.17.0"
-  resolved "https://registry.yarnpkg.com/prettier/-/prettier-1.17.0.tgz#53b303676eed22cc14a9f0cec09b477b3026c008"
-  integrity sha512-sXe5lSt2WQlCbydGETgfm1YBShgOX4HxQkFPvbxkcwgDvGDeqVau8h+12+lmSVlP3rHPz0oavfddSZg/q+Szjw==
+prettier@1.17.1:
+  version "1.17.1"
+  resolved "https://registry.yarnpkg.com/prettier/-/prettier-1.17.1.tgz#ed64b4e93e370cb8a25b9ef7fef3e4fd1c0995db"
+  integrity sha512-TzGRNvuUSmPgwivDqkZ9tM/qTGW9hqDKWOE9YHiyQdixlKbv7kvEqsmDPrcHJTKwthU774TQwZXVtaQ/mMsvjg==
 
 pretty-bytes@^5.0.0:
   version "5.3.0"