diff --git a/Cargo.lock b/Cargo.lock
index 5760737..81c8690 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1100,7 +1100,7 @@ dependencies = [
 
 [[package]]
 name = "once_cell"
-version = "1.3.0"
+version = "1.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -1199,7 +1199,7 @@ dependencies = [
  "itertools 0.8.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "mime 0.3.16 (registry+https://github.com/rust-lang/crates.io-index)",
- "once_cell 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "once_cell 1.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "pulldown-cmark 0.6.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand 0.7.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "reqwest 0.9.24 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -2448,7 +2448,7 @@ dependencies = [
 "checksum num-integer 0.1.42 (registry+https://github.com/rust-lang/crates.io-index)" = "3f6ea62e9d81a77cd3ee9a2a5b9b609447857f3d358704331e4ef39eb247fcba"
 "checksum num-traits 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)" = "c62be47e61d1842b9170f0fdeec8eba98e60e90e5446449a0545e5152acd7096"
 "checksum num_cpus 1.11.1 (registry+https://github.com/rust-lang/crates.io-index)" = "76dac5ed2a876980778b8b85f75a71b6cbf0db0b1232ee12f826bccb00d09d72"
-"checksum once_cell 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)" = "f5941ec2d5ee5916c709580d71553b81a633df245bcc73c04dcbd62152ceefc4"
+"checksum once_cell 1.3.1 (registry+https://github.com/rust-lang/crates.io-index)" = "b1c601810575c99596d4afc46f78a678c80105117c379eb3650cf99b8a21ce5b"
 "checksum opaque-debug 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)" = "2839e79665f131bdb5782e51f2c6c9599c133c6098982a54c794358bf432529c"
 "checksum openssl 0.10.26 (registry+https://github.com/rust-lang/crates.io-index)" = "3a3cc5799d98e1088141b8e01ff760112bbd9f19d850c124500566ca6901a585"
 "checksum openssl-probe 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)" = "77af24da69f9d9341038eba93a073b1fdaaa1b788221b00a69bce9e762cb32de"
diff --git a/Cargo.toml b/Cargo.toml
index d9c4294..2a636af 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -18,7 +18,7 @@ futures03 = { version = "0.3.1", package = "futures", features = ["compat"] }
 itertools = "0.8.2"
 log = "0.4.8"
 mime = "0.3.16"
-once_cell = "1.3.0"
+once_cell = "1.3.1"
 pulldown-cmark = "0.6.1"
 rand = "0.7.3"
 reqwest = "0.9.24"