diff --git a/Cargo.lock b/Cargo.lock
index a550db6..1361c27 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -407,9 +407,9 @@ dependencies = [
 
 [[package]]
 name = "proc-macro2"
-version = "1.0.47"
+version = "1.0.70"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5ea3d908b0e36316caf9e9e2c4625cdde190a7e6f440d794667ed17a1855e725"
+checksum = "39278fbbf5fb4f646ce651690877f89d1c5811a3d4acb27700c1cb3cdb78fd3b"
 dependencies = [
  "unicode-ident",
 ]
@@ -494,6 +494,7 @@ dependencies = [
  "embedded-graphics",
  "image",
  "png 0.17.7",
+ "proc-macro2",
  "qrcode",
  "regex",
 ]
diff --git a/Cargo.toml b/Cargo.toml
index acfe754..fe16b6c 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -8,7 +8,8 @@ argh = "0.1.9"
 anyhow = "1.0.66"
 barcoders = "1.0.2"
 embedded-graphics = "0.7.1"
-png = "0.17.7"
+png = "~0.17.7"
 qrcode = "0.12.0"
 image = "^0.23"
 regex = "1"
+proc-macro2 = "1.0.70"