diff --git a/Cargo.lock b/Cargo.lock
index d65aec9a..6be5ec18 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -154,7 +154,7 @@ dependencies = [
 
 [[package]]
 name = "deflate"
-version = "0.7.20"
+version = "0.8.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "adler32 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -181,7 +181,7 @@ dependencies = [
 
 [[package]]
 name = "image"
-version = "0.23.0"
+version = "0.23.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "bytemuck 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -189,7 +189,7 @@ dependencies = [
  "num-iter 0.1.40 (registry+https://github.com/rust-lang/crates.io-index)",
  "num-rational 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "num-traits 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
- "png 0.15.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "png 0.16.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -202,7 +202,7 @@ dependencies = [
 
 [[package]]
 name = "itertools"
-version = "0.8.2"
+version = "0.9.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "either 1.5.3 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -294,8 +294,8 @@ dependencies = [
  "clap 2.33.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "cloudflare-zlib 0.2.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "crc 1.8.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "image 0.23.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "itertools 0.8.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "image 0.23.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "itertools 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "miniz_oxide 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "num_cpus 1.12.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "rayon 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -306,12 +306,12 @@ dependencies = [
 
 [[package]]
 name = "png"
-version = "0.15.3"
+version = "0.16.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "bitflags 1.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "crc32fast 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "deflate 0.7.20 (registry+https://github.com/rust-lang/crates.io-index)",
+ "deflate 0.8.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "inflate 0.4.5 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -455,13 +455,13 @@ dependencies = [
 "checksum crossbeam-epoch 0.8.2 (registry+https://github.com/rust-lang/crates.io-index)" = "058ed274caafc1f60c4997b5fc07bf7dc7cca454af7c6e81edffe5f33f70dace"
 "checksum crossbeam-queue 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)" = "c695eeca1e7173472a32221542ae469b3e9aac3a4fc81f7696bcad82029493db"
 "checksum crossbeam-utils 0.7.2 (registry+https://github.com/rust-lang/crates.io-index)" = "c3c7c73a2d1e9fc0886a08b93e98eb643461230d5f1925e4036204d5f2e261a8"
-"checksum deflate 0.7.20 (registry+https://github.com/rust-lang/crates.io-index)" = "707b6a7b384888a70c8d2e8650b3e60170dfc6a67bb4aa67b6dfca57af4bedb4"
+"checksum deflate 0.8.3 (registry+https://github.com/rust-lang/crates.io-index)" = "050ef6de42a33903b30a7497b76b40d3d58691d4d3eec355348c122444a388f0"
 "checksum either 1.5.3 (registry+https://github.com/rust-lang/crates.io-index)" = "bb1f6b1ce1c140482ea30ddd3335fc0024ac7ee112895426e0a629a6c20adfe3"
 "checksum glob 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)" = "9b919933a397b79c37e33b77bb2aa3dc8eb6e165ad809e58ff75bc7db2e34574"
 "checksum hermit-abi 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)" = "1010591b26bbfe835e9faeabeb11866061cc7dcebffd56ad7d0942d0e61aefd8"
-"checksum image 0.23.0 (registry+https://github.com/rust-lang/crates.io-index)" = "ef4e336ec01a678e7ab692914c641181528e8656451e6252f8f9e33728882eaf"
+"checksum image 0.23.2 (registry+https://github.com/rust-lang/crates.io-index)" = "9062b90712d25bc6bb165d110aa59c6b47c849246e341e7b86a98daff9d49f60"
 "checksum inflate 0.4.5 (registry+https://github.com/rust-lang/crates.io-index)" = "1cdb29978cc5797bd8dcc8e5bf7de604891df2a8dc576973d71a281e916db2ff"
-"checksum itertools 0.8.2 (registry+https://github.com/rust-lang/crates.io-index)" = "f56a2d0bc861f9165be4eb3442afd3c236d8a98afd426f65d92324ae1091a484"
+"checksum itertools 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)" = "284f18f85651fe11e8a991b2adb42cb078325c996ed026d994719efcfca1d54b"
 "checksum lazy_static 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "e2abad23fbc42b3700f2f279844dc832adb2b2eb069b2df918f455c4e18cc646"
 "checksum libc 0.2.67 (registry+https://github.com/rust-lang/crates.io-index)" = "eb147597cdf94ed43ab7a9038716637d2d1bf2bc571da995d0028dec06bd3018"
 "checksum maybe-uninit 2.0.0 (registry+https://github.com/rust-lang/crates.io-index)" = "60302e4db3a61da70c0cb7991976248362f30319e88850c487b9b95bbf059e00"
@@ -472,7 +472,7 @@ dependencies = [
 "checksum num-rational 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)" = "da4dc79f9e6c81bef96148c8f6b8e72ad4541caa4a24373e900a36da07de03a3"
 "checksum num-traits 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)" = "c62be47e61d1842b9170f0fdeec8eba98e60e90e5446449a0545e5152acd7096"
 "checksum num_cpus 1.12.0 (registry+https://github.com/rust-lang/crates.io-index)" = "46203554f085ff89c235cd12f7075f3233af9b11ed7c9e16dfe2560d03313ce6"
-"checksum png 0.15.3 (registry+https://github.com/rust-lang/crates.io-index)" = "ef859a23054bbfee7811284275ae522f0434a3c8e7f4b74bd4a35ae7e1c4a283"
+"checksum png 0.16.1 (registry+https://github.com/rust-lang/crates.io-index)" = "46060468187c21c00ffa2a920690b29997d7fd543f5a4d400461e4a7d4fccde8"
 "checksum rayon 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)" = "db6ce3297f9c85e16621bb8cca38a06779ffc31bb8184e1be4bed2be4678a098"
 "checksum rayon-core 1.7.0 (registry+https://github.com/rust-lang/crates.io-index)" = "08a89b46efaf957e52b18062fb2f4660f8b8a4dde1807ca002690868ef2c85a9"
 "checksum rgb 0.8.16 (registry+https://github.com/rust-lang/crates.io-index)" = "5ec4ab2cf0b27e111e266e161cf7f9efd20125a161190da1c0945c4a4408fef3"
diff --git a/Cargo.toml b/Cargo.toml
index a59df56f..d37fa5b6 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -31,7 +31,7 @@ required-features = ["binary"]
 bit-vec = "^0.6.0"
 byteorder = "^1.0.0"
 crc = "^1.2.0"
-itertools = "^0.8.0"
+itertools = "^0.9.0"
 num_cpus = "^1.0.0"
 zopfli = "^0.4.0"
 miniz_oxide = "0.3"
diff --git a/package-lock.json b/package-lock.json
index 811dc5b4..1d65199e 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -177,9 +177,9 @@
       }
     },
     "minimist": {
-      "version": "1.2.0",
-      "resolved": "https://registry.npmjs.org/minimist/-/minimist-1.2.0.tgz",
-      "integrity": "sha1-o1AIsg9BOD7sH7kU9M1d95omQoQ=",
+      "version": "1.2.5",
+      "resolved": "https://registry.npmjs.org/minimist/-/minimist-1.2.5.tgz",
+      "integrity": "sha512-FM9nNUYrRBAELZQT3xeZQ7fmMOBg6nWNmJKTcgsJeaLstP/UODVpGsr5OhXhhXg6f+qtJ8uiZ+PUxkDWcgIXLw==",
       "dev": true
     },
     "normalize-package-data": {