diff --git a/proto/01-protoc-base/checksums.txt b/proto/01-protoc-base/checksums.txt
index dea8f41..6719036 100644
--- a/proto/01-protoc-base/checksums.txt
+++ b/proto/01-protoc-base/checksums.txt
@@ -1,4 +1,4 @@
-4966d0dce71a637b3b46de511aefc52c5df449159c6acbd7967ba742944012fd  protobuf-javascript-3.21.4-linux-x86_64.zip
-58b1e2e45889187c22598bf5d9944d7c4f5f68407906f26cc4831911ae8ada53  protoc-28.1-linux-x86_64.zip
+f853e691868d0557425ea290bf7ba6384eef2fa9b04c323afab49a770ba9da80  protoc-25.3-linux-x86_64.zip
+b0f50f6a857c3e17f7a83ce90d9f877640381100289fedc4658dc47d69bc7f36  protoc-gen-grpc-java-1.63.1-linux-x86_64.exe
+075ed6163fea314c415f67a4af68d1b6dbddc8fa8be35addf74e4c81812a9148  protobuf-javascript-3.21.2-linux-x86_64.zip
 47cd72b07e6dab3408d686a65d37d3a6ab616da7d8b564b2bd2a2963a72b72fd  protoc-gen-doc_1.5.1_linux_amd64.tar.gz
-654626545f36b0cda5179e4b46c7bde2a8eefee8d265d346967c8542537137a8  protoc-gen-grpc-java-1.66.0-linux-x86_64.exe
diff --git a/proto/01-protoc-base/install.sh b/proto/01-protoc-base/install.sh
index b39a03e..331fd3a 100755
--- a/proto/01-protoc-base/install.sh
+++ b/proto/01-protoc-base/install.sh
@@ -23,13 +23,13 @@ python3 -m pip install -q --no-cache-dir --upgrade setuptools
 python3 -m pip install -q --no-cache-dir -r "${__dir}/requirements.txt"
 python3 -m pip list
 
-pbuf_ver=28.1
+pbuf_ver=25.3
 wget -q "https://github.com/protocolbuffers/protobuf/releases/download/v${pbuf_ver}/protoc-${pbuf_ver}-linux-x86_64.zip"
 
-java_plugin_ver=1.66.0
+java_plugin_ver=1.63.1
 wget -q "https://repo1.maven.org/maven2/io/grpc/protoc-gen-grpc-java/${java_plugin_ver}/protoc-gen-grpc-java-${java_plugin_ver}-linux-x86_64.exe"
 
-js_ver=3.21.4
+js_ver=3.21.2
 wget -q "https://github.com/protocolbuffers/protobuf-javascript/releases/download/v${js_ver}/protobuf-javascript-${js_ver}-linux-x86_64.zip"
 
 doc_plugin_ver=1.5.1