diff --git a/Cargo.lock b/Cargo.lock
index aef5a92..ae9ef69 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -203,7 +203,7 @@ dependencies = [
 [[package]]
 name = "derive_miniconf"
 version = "0.1.0"
-source = "git+https://github.com/quartiq/miniconf.git?rev=c8d819c#c8d819cdab65f18396e65dafa3558daea29e3031"
+source = "git+https://github.com/quartiq/miniconf.git?rev=c6f2b28#c6f2b28f735e27b337eaa986846536e904c6f2bd"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -416,10 +416,9 @@ dependencies = [
 [[package]]
 name = "miniconf"
 version = "0.1.0"
-source = "git+https://github.com/quartiq/miniconf.git?rev=c8d819c#c8d819cdab65f18396e65dafa3558daea29e3031"
+source = "git+https://github.com/quartiq/miniconf.git?rev=c6f2b28#c6f2b28f735e27b337eaa986846536e904c6f2bd"
 dependencies = [
  "derive_miniconf",
- "heapless 0.6.1",
  "serde",
  "serde-json-core",
 ]
@@ -689,8 +688,9 @@ dependencies = [
 
 [[package]]
 name = "serde-json-core"
-version = "0.2.0"
-source = "git+https://github.com/rust-embedded-community/serde-json-core.git?rev=da460d1#da460d123e217f0e822a3977eb2170ed5d279d5e"
+version = "0.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "39af17f40c2a28d2c9a7918663ddc8a10f54cc6f109ead5c3f010869761df186"
 dependencies = [
  "heapless 0.6.1",
  "ryu",