diff --git a/Cargo.lock b/Cargo.lock
index 1c7edfe..1c415e8 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -417,7 +417,7 @@ source = "git+https://github.com/quartiq/miniconf.git?rev=c6f2b28#c6f2b28f735e27
 dependencies = [
  "derive_miniconf",
  "serde",
- "serde-json-core",
+ "serde-json-core 0.3.0",
 ]
 
 [[package]]
@@ -717,6 +717,17 @@ dependencies = [
  "serde",
 ]
 
+[[package]]
+name = "serde-json-core"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8014aeea272bca0f0779778d43253f2f3375b414185b30e6ecc4d3e4a9994781"
+dependencies = [
+ "heapless 0.7.1",
+ "ryu",
+ "serde",
+]
+
 [[package]]
 name = "serde_derive"
 version = "1.0.126"
@@ -782,7 +793,7 @@ dependencies = [
  "rtt-logger",
  "rtt-target",
  "serde",
- "serde-json-core",
+ "serde-json-core 0.4.0",
  "shared-bus",
  "smoltcp-nal",
  "stm32h7xx-hal",
diff --git a/Cargo.toml b/Cargo.toml
index 6dedf83..66dc0a8 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -44,7 +44,7 @@ dsp = { path = "dsp" }
 ad9959 = { path = "ad9959" }
 miniconf = "0.1.0"
 shared-bus = {version = "0.2.2", features = ["cortex-m"] }
-serde-json-core = "0.3"
+serde-json-core = "0.4"
 
 # rtt-target bump
 [dependencies.rtt-logger]