diff --git a/compiler/Dockerfile b/compiler/Dockerfile
index 6d1b527..d5e0cf6 100644
--- a/compiler/Dockerfile
+++ b/compiler/Dockerfile
@@ -2,7 +2,7 @@
 
 RUN scl enable devtoolset-1.1 'bash -c "cd /protobuf && \
     git fetch && \
-    git checkout v3.2.0 && \
+    git checkout v3.3.1 && \
     ./autogen.sh && \
     CXXFLAGS=-m32 ./configure --disable-shared --prefix=/protobuf-32 && \
     make clean && make -j$(nproc) && make -j$(nproc) install"'
diff --git a/compiler/build.gradle b/compiler/build.gradle
index 10d9c31..a614131 100644
--- a/compiler/build.gradle
+++ b/compiler/build.gradle
@@ -162,7 +162,7 @@
     if (project.hasProperty('protoc')) {
       path = project.protoc
     } else {
-      artifact = "com.google.protobuf:protoc:${protobufVersion}"
+      artifact = "com.google.protobuf:protoc:${protocVersion}"
     }
   }
   plugins {
@@ -216,7 +216,7 @@
   source = fileTree(dir: "src/testNano", include: "**/*.java")
 }
 
-println "*** Building codegen requires Protobuf version ${protobufVersion}"
+println "*** Building codegen requires Protobuf version ${protocVersion}"
 println "*** Please refer to https://github.com/grpc/grpc-java/blob/master/COMPILING.md#how-to-build-code-generation-plugin"
 
 task buildArtifacts(type: Copy) {