diff --git a/Cargo.lock b/Cargo.lock
index a6d33bc..4c7b0ea 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2,6 +2,15 @@
 # It is not intended for manual editing.
 version = 3
 
+[[package]]
+name = "android_system_properties"
+version = "0.1.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d7ed72e1635e121ca3e79420540282af22da58be50de153d36f81ddc6b83aa9e"
+dependencies = [
+ "libc",
+]
+
 [[package]]
 name = "autocfg"
 version = "1.1.0"
@@ -22,10 +31,11 @@ checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
 
 [[package]]
 name = "chrono"
-version = "0.4.20"
+version = "0.4.21"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6127248204b9aba09a362f6c930ef6a78f2c1b2215f8a7b398c06e1083f17af0"
+checksum = "3f725f340c3854e3cb3ab736dc21f0cca183303acea3b3ffec30f141503ac8eb"
 dependencies = [
+ "iana-time-zone",
  "js-sys",
  "num-integer",
  "num-traits",
@@ -33,6 +43,25 @@ dependencies = [
  "winapi",
 ]
 
+[[package]]
+name = "core-foundation-sys"
+version = "0.8.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5827cebf4670468b8772dd191856768aedcb1b0278a04f989f7766351917b9dc"
+
+[[package]]
+name = "iana-time-zone"
+version = "0.1.44"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "808cf7d67cf4a22adc5be66e75ebdf769b3f2ea032041437a7061f97a63dad4b"
+dependencies = [
+ "android_system_properties",
+ "core-foundation-sys",
+ "js-sys",
+ "wasm-bindgen",
+ "winapi",
+]
+
 [[package]]
 name = "js-sys"
 version = "0.3.59"
@@ -42,6 +71,12 @@ dependencies = [
  "wasm-bindgen",
 ]
 
+[[package]]
+name = "libc"
+version = "0.2.131"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "04c3b4822ccebfa39c02fc03d1534441b22ead323fa0f48bb7ddd8e6ba076a40"
+
 [[package]]
 name = "log"
 version = "0.4.17"