diff --git a/Cargo.toml b/Cargo.toml
index 0d5d9b2c..a4c74a8b 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -64,12 +64,44 @@ slice-group-by = "0.3.1"
 
 # Unblock minimal dependency version check
 [dependencies.proc-macro2]
-version = ">1.0.60"
+version = ">=1.0.86"
+default-features = false
+optional = true
+
+[dependencies.proc-macro-error]
+version = "1.0.4"
+default-features = false
+optional = true
+
+[dependencies.quote]
+version = "1.0.36"
+default-features = false
+optional = true
+
+[dependencies.defmt-parser]
+version = "0.3.4"
+default-features = false
+optional = true
+
+[dependencies.defmt-test-macros]
+version = "0.3.1"
+default-features = false
+optional = true
+
+[dependencies.thiserror]
+version = "1.0.61"
+default-features = false
+optional = true
+
+[dependencies.thiserror-impl]
+version = "1.0.61"
+default-features = false
+optional = true
 
 [features]
 can = ["dep:bxcan"]
 default = ["rt", "ld", "usb", "can", "rtc", "enumset"]
-defmt = ["dep:defmt"]
+defmt = ["dep:defmt", "dep:defmt-parser", "dep:defmt-test-macros", "dep:thiserror", "dep:thiserror-impl", "dep:proc-macro-error", "dep:quote"]
 
 device-selected = []
 direct-call-deprecated = []