diff --git a/package-lock.json b/package-lock.json
index 5234b1b7..f05627ed 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "io-ts",
-  "version": "2.2.17",
+  "version": "2.2.19",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
       "name": "io-ts",
-      "version": "2.2.17",
+      "version": "2.2.19",
       "license": "MIT",
       "devDependencies": {
         "@types/benchmark": "1.0.31",
@@ -21,7 +21,7 @@
         "dtslint": "github:gcanti/dtslint",
         "eslint": "^7.18.0",
         "fast-check": "^1.24.2",
-        "fp-ts": "^2.5.0",
+        "fp-ts": "^2.16.5",
         "import-path-rewrite": "github:gcanti/import-path-rewrite",
         "jest": "25.2.7",
         "mocha": "7.1.1",
@@ -2929,12 +2929,6 @@
         "typescript": "^3.3.1 || ^4.x"
       }
     },
-    "node_modules/docs-ts/node_modules/fp-ts": {
-      "version": "2.9.5",
-      "resolved": "https://registry.npmjs.org/fp-ts/-/fp-ts-2.9.5.tgz",
-      "integrity": "sha512-MiHrA5teO6t8zKArE3DdMPT/Db6v2GUt5yfWnhBTrrsVfeCJUUnV6sgFvjGNBKDmEMqVwRFkEePL7wPwqrLKKA==",
-      "dev": true
-    },
     "node_modules/docs-ts/node_modules/glob": {
       "version": "7.1.6",
       "resolved": "https://registry.npmjs.org/glob/-/glob-7.1.6.tgz",
@@ -4165,10 +4159,11 @@
       }
     },
     "node_modules/fp-ts": {
-      "version": "2.5.0",
-      "resolved": "https://registry.npmjs.org/fp-ts/-/fp-ts-2.5.0.tgz",
-      "integrity": "sha512-xkC9ZKl/i2cU+8FAsdyLcTvPRXphp42FcK5WmZpB47VXb4gggC3DHlVDKNLdbC+U8zz6yp1b0bj0mZg0axmZYQ==",
-      "dev": true
+      "version": "2.16.5",
+      "resolved": "https://registry.npmjs.org/fp-ts/-/fp-ts-2.16.5.tgz",
+      "integrity": "sha512-N8T8PwMSeTKKtkm9lkj/zSTAnPC/aJIIrQhnHxxkL0KLsRCNUPANksJOlMXxcKKCo7H1ORP3No9EMD+fP0tsdA==",
+      "dev": true,
+      "license": "MIT"
     },
     "node_modules/fragment-cache": {
       "version": "0.2.1",
@@ -13330,12 +13325,6 @@
         "ts-node": "^8.10.2"
       },
       "dependencies": {
-        "fp-ts": {
-          "version": "2.9.5",
-          "resolved": "https://registry.npmjs.org/fp-ts/-/fp-ts-2.9.5.tgz",
-          "integrity": "sha512-MiHrA5teO6t8zKArE3DdMPT/Db6v2GUt5yfWnhBTrrsVfeCJUUnV6sgFvjGNBKDmEMqVwRFkEePL7wPwqrLKKA==",
-          "dev": true
-        },
         "glob": {
           "version": "7.1.6",
           "resolved": "https://registry.npmjs.org/glob/-/glob-7.1.6.tgz",
@@ -13462,7 +13451,7 @@
     "dtslint": {
       "version": "git+ssh://git@github.com/gcanti/dtslint.git#f361dc93d6a195f530df28779082548e01cecd5e",
       "dev": true,
-      "from": "dtslint@gcanti/dtslint",
+      "from": "dtslint@github:gcanti/dtslint",
       "requires": {
         "fs-extra": "^6.0.1",
         "parsimmon": "^1.12.0",
@@ -14286,9 +14275,9 @@
       "dev": true
     },
     "fp-ts": {
-      "version": "2.5.0",
-      "resolved": "https://registry.npmjs.org/fp-ts/-/fp-ts-2.5.0.tgz",
-      "integrity": "sha512-xkC9ZKl/i2cU+8FAsdyLcTvPRXphp42FcK5WmZpB47VXb4gggC3DHlVDKNLdbC+U8zz6yp1b0bj0mZg0axmZYQ==",
+      "version": "2.16.5",
+      "resolved": "https://registry.npmjs.org/fp-ts/-/fp-ts-2.16.5.tgz",
+      "integrity": "sha512-N8T8PwMSeTKKtkm9lkj/zSTAnPC/aJIIrQhnHxxkL0KLsRCNUPANksJOlMXxcKKCo7H1ORP3No9EMD+fP0tsdA==",
       "dev": true
     },
     "fragment-cache": {
diff --git a/package.json b/package.json
index 8f799159..a11102eb 100644
--- a/package.json
+++ b/package.json
@@ -53,7 +53,7 @@
     "dtslint": "github:gcanti/dtslint",
     "eslint": "^7.18.0",
     "fast-check": "^1.24.2",
-    "fp-ts": "^2.5.0",
+    "fp-ts": "^2.16.5",
     "import-path-rewrite": "github:gcanti/import-path-rewrite",
     "jest": "25.2.7",
     "mocha": "7.1.1",