diff --git a/Dockerfile.arm64 b/Dockerfile.arm64
index 36932b7..a993a65 100644
--- a/Dockerfile.arm64
+++ b/Dockerfile.arm64
@@ -1,7 +1,5 @@
 FROM docker.io/rust:bullseye
 
-ENV CARGO_REGISTRIES_CRATES_IO_PROTOCOL=sparse
-
 RUN apt-get update && apt-get upgrade -y
 RUN apt-get install -y g++-arm-linux-gnueabihf libc6-dev-armhf-cross
 # Uncomment if you need to add more build dependencies to the image:
diff --git a/Dockerfile.armhf b/Dockerfile.armhf
index e07d2ec..11d86c3 100644
--- a/Dockerfile.armhf
+++ b/Dockerfile.armhf
@@ -1,7 +1,5 @@
 FROM docker.io/rust:bullseye
 
-ENV CARGO_REGISTRIES_CRATES_IO_PROTOCOL=sparse
-
 RUN apt-get update && apt-get upgrade -y
 RUN apt-get install -y g++-aarch64-linux-gnu libc6-dev-arm64-cross
 # Uncomment if you need to add more build dependencies to the image:
diff --git a/Dockerfile.i386 b/Dockerfile.i386
index b10d756..41c895b 100644
--- a/Dockerfile.i386
+++ b/Dockerfile.i386
@@ -1,7 +1,5 @@
 FROM docker.io/rust:bullseye
 
-ENV CARGO_REGISTRIES_CRATES_IO_PROTOCOL=sparse
-
 RUN apt-get update && apt-get upgrade -y
 # Uncomment if you need to add more build dependencies to the image:
 # RUN apt-get install -y <build-depend..>