diff --git a/Cargo.lock b/Cargo.lock
index babfd42a..e0ddc83b 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2613,18 +2613,18 @@ dependencies = [
 
 [[package]]
 name = "thiserror"
-version = "1.0.20"
+version = "1.0.21"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7dfdd070ccd8ccb78f4ad66bf1982dc37f620ef696c6b5028fe2ed83dd3d0d08"
+checksum = "318234ffa22e0920fe9a40d7b8369b5f649d490980cf7aadcf1eb91594869b42"
 dependencies = [
  "thiserror-impl",
 ]
 
 [[package]]
 name = "thiserror-impl"
-version = "1.0.20"
+version = "1.0.21"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "bd80fc12f73063ac132ac92aceea36734f04a1d93c1240c6944e23a3b8841793"
+checksum = "cae2447b6282786c3493999f40a9be2a6ad20cb8bd268b0a0dbf5a065535c0ab"
 dependencies = [
  "proc-macro2 1.0.19",
  "quote 1.0.7",
diff --git a/zebra-consensus/Cargo.toml b/zebra-consensus/Cargo.toml
index 9c0da72f..a5b8bbb4 100644
--- a/zebra-consensus/Cargo.toml
+++ b/zebra-consensus/Cargo.toml
@@ -16,7 +16,7 @@ serde = { version = "1", features = ["serde_derive"] }
 futures = "0.3.6"
 futures-util = "0.3.6"
 metrics = "0.12"
-thiserror = "1.0.20"
+thiserror = "1.0.21"
 tokio = { version = "0.2.22", features = ["time", "sync", "stream", "tracing"] }
 tower = { version = "0.3", features = ["timeout", "util", "buffer"] }
 tower-util = "0.3"
diff --git a/zebra-script/Cargo.toml b/zebra-script/Cargo.toml
index 5cd19036..1b3518da 100644
--- a/zebra-script/Cargo.toml
+++ b/zebra-script/Cargo.toml
@@ -10,7 +10,7 @@ edition = "2018"
 [dependencies]
 zcash_script = "0.1.2"
 zebra-chain = { path = "../zebra-chain" }
-thiserror = "1.0.20"
+thiserror = "1.0.21"
 displaydoc = "0.1.7"
 
 [dev-dependencies]
diff --git a/zebra-state/Cargo.toml b/zebra-state/Cargo.toml
index 0c31c5af..4f1690f8 100644
--- a/zebra-state/Cargo.toml
+++ b/zebra-state/Cargo.toml
@@ -22,7 +22,7 @@ metrics = "0.12"
 tower = { version = "0.3.1", features = ["buffer", "util"] }
 tracing = "0.1"
 tracing-error = "0.1.2"
-thiserror = "1.0.20"
+thiserror = "1.0.21"
 tokio = { version = "0.2.22", features = ["sync"] }
 
 [dev-dependencies]
diff --git a/zebra-test/Cargo.toml b/zebra-test/Cargo.toml
index e6b60cd4..0665a52d 100644
--- a/zebra-test/Cargo.toml
+++ b/zebra-test/Cargo.toml
@@ -18,7 +18,7 @@ tracing-subscriber = "0.2.12"
 tracing-error = "0.1.2"
 spandoc = "0.2.0"
 regex = "1.3.9"
-thiserror = "1.0.20"
+thiserror = "1.0.21"
 pretty_assertions = "0.6.1"
 owo-colors = "1.1.3"
 proptest = "0.10.1"