diff --git a/Cargo.lock b/Cargo.lock
index 8a4328c..9b73247 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -208,9 +208,9 @@ dependencies = [
 
 [[package]]
 name = "env_logger"
-version = "0.7.1"
+version = "0.9.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "44533bbbb3bb3c1fa17d9f2e4e38bbbaf8396ba82193c4cb1b6445d711445d36"
+checksum = "0b2cf0344971ee6c64c31be0d530793fba457d322dfec2810c453d0ef228f9c3"
 dependencies = [
  "atty",
  "humantime",
@@ -423,12 +423,9 @@ checksum = "c4a1e36c821dbe04574f602848a19f742f4fb3c98d40449f11bcad18d6b17421"
 
 [[package]]
 name = "humantime"
-version = "1.3.0"
+version = "2.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "df004cfca50ef23c36850aaaa59ad52cc70d0e90243c3c7737a4dd32dc7a3c4f"
-dependencies = [
- "quick-error",
-]
+checksum = "9a3a5bfb195931eeb336b2a7b4d761daec841b97f947d34394601737a7bba5e4"
 
 [[package]]
 name = "hyper"
@@ -553,9 +550,9 @@ checksum = "a3e378b66a060d48947b590737b30a1be76706c8dd7b8ba0f2fe3989c68a853f"
 
 [[package]]
 name = "mdbook"
-version = "0.4.18"
+version = "0.4.21"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "74612ae81a3e5ee509854049dfa4c7975ae033c06f5fc4735c7dfbe60ee2a39d"
+checksum = "23f3e133c6d515528745ffd3b9f0c7d975ae039f0b6abb099f2168daa2afb4f9"
 dependencies = [
  "anyhow",
  "chrono",
@@ -570,7 +567,6 @@ dependencies = [
  "pulldown-cmark",
  "regex",
  "serde",
- "serde_derive",
  "serde_json",
  "shlex",
  "tempfile",
@@ -580,7 +576,7 @@ dependencies = [
 
 [[package]]
 name = "mdbook-kroki-preprocessor"
-version = "0.1.1"
+version = "0.1.2"
 dependencies = [
  "anyhow",
  "futures",
@@ -848,12 +844,6 @@ dependencies = [
  "pulldown-cmark",
 ]
 
-[[package]]
-name = "quick-error"
-version = "1.2.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a1d01941d82fa2ab50be1e79e6714289dd7cde78eba4c074bc5a4374f650dfe0"
-
 [[package]]
 name = "quote"
 version = "1.0.19"
diff --git a/Cargo.toml b/Cargo.toml
index cf02f43..1112da7 100755
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "mdbook-kroki-preprocessor"
-version = "0.1.1"
+version = "0.1.2"
 authors = ["Joel Courtney <joel.e.courtney@gmail.com>"]
 description = "render kroki diagrams from files or code blocks in mdbook"
 edition = "2021"
@@ -11,7 +11,7 @@ license-file = "LICENSE"
 
 [dependencies]
 anyhow = "1.0.58"
-mdbook = { version = "0.4.18", default-features = false }
+mdbook = { version = "0.4.21", default-features = false }
 pulldown-cmark = { version = "0.9.1", default-features = false }
 pulldown-cmark-to-cmark = "10.0.1"
 reqwest = "0.11.11"