diff --git a/Cargo.lock b/Cargo.lock
index e7412bc9..157a3e32 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -205,7 +205,7 @@ dependencies = [
  "num-iter 0.1.41 (registry+https://github.com/rust-lang/crates.io-index)",
  "num-rational 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "num-traits 0.2.12 (registry+https://github.com/rust-lang/crates.io-index)",
- "png 0.16.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "png 0.16.7 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -369,7 +369,7 @@ dependencies = [
 
 [[package]]
 name = "png"
-version = "0.16.6"
+version = "0.16.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "bitflags 1.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -630,7 +630,7 @@ dependencies = [
 "checksum num-traits 0.2.12 (registry+https://github.com/rust-lang/crates.io-index)" = "ac267bcc07f48ee5f8935ab0d24f316fb722d7a1292e2913f0cc196b29ffd611"
 "checksum num_cpus 1.13.0 (registry+https://github.com/rust-lang/crates.io-index)" = "05499f3756671c15885fee9034446956fff3f243d6077b91e5767df161f766b3"
 "checksum numtoa 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "b8f8bdf33df195859076e54ab11ee78a1b208382d3a26ec40d142ffc1ecc49ef"
-"checksum png 0.16.6 (registry+https://github.com/rust-lang/crates.io-index)" = "c150bf7479fafe3dd8740dbe48cc33b2a3efb7b0fe3483aced8bbc39f6d0238d"
+"checksum png 0.16.7 (registry+https://github.com/rust-lang/crates.io-index)" = "dfe7f9f1c730833200b134370e1d5098964231af8450bce9b78ee3ab5278b970"
 "checksum rayon 1.3.1 (registry+https://github.com/rust-lang/crates.io-index)" = "62f02856753d04e03e26929f820d0a0a337ebe71f849801eea335d464b349080"
 "checksum rayon-core 1.7.1 (registry+https://github.com/rust-lang/crates.io-index)" = "e92e15d89083484e11353891f1af602cc661426deb9564c298b270c726973280"
 "checksum redox_syscall 0.1.57 (registry+https://github.com/rust-lang/crates.io-index)" = "41cc0f7e4d5d4544e8861606a285bb08d3e70712ccc7d2b84d7c0ccfaf4b05ce"