diff --git a/browser-asmjs/Dockerfile b/browser-asmjs/Dockerfile
index 7f705cc..3e51f8d 100644
--- a/browser-asmjs/Dockerfile
+++ b/browser-asmjs/Dockerfile
@@ -8,17 +8,17 @@ RUN curl -sL https://deb.nodesource.com/setup | bash - && \
     nodejs \
     python2.7
 
-ENV EMSCRIPTEN_VERSION 1.33.0
+ENV EMSCRIPTEN_VERSION 1.34.3
 RUN cd /usr && \
   curl -L https://s3.amazonaws.com/mozilla-games/emscripten/releases/emsdk-portable.tar.gz | tar xz && \
   cd ./emsdk_portable && \
   ./emsdk update && \
-  ./emsdk install -j$(nproc) --build=Release sdk-master-64bit && \
-  ./emsdk activate --build=Release sdk-master-64bit && \
+  ./emsdk install -j$(nproc) --build=Release sdk-tag-${EMSCRIPTEN_VERSION}-64bit && \
+  ./emsdk activate --build=Release sdk-tag-${EMSCRIPTEN_VERSION}-64bit && \
   find . -name "*.o" -exec rm {} \; && \
   find . -name "*.a" -exec rm {} \; && \
   find . -name "*.tmp" -exec rm {} \;
 
-ENV PATH /usr/emsdk_portable:/usr/emsdk_portable/clang/fastcomp/build_master_64/bin:/usr/emsdk_portable/emscripten/master:${PATH}
+ENV PATH /usr/emsdk_portable:/usr/emsdk_portable/clang/tag-e${EMSCRIPTEN_VERSION}/build_tag-e${EMSCRIPTEN_VERSION}_64/bin:/usr/emsdk_portable/emscripten/tag-${EMSCRIPTEN_VERSION}:${PATH}
 
 ENV CMAKE_TOOLCHAIN_FILE /usr/emsdk_portable/emscripten/master/cmake/Modules/Platform/Emscripten.cmake