diff --git a/packages/binutils/build/Dockerfile b/packages/binutils/build/Dockerfile
index 49dbd1d..448271b 100644
--- a/packages/binutils/build/Dockerfile
+++ b/packages/binutils/build/Dockerfile
@@ -1,4 +1,4 @@
-FROM emscripten/emsdk:4.0.19 AS builder
+FROM emscripten/emsdk:4.0.20 AS builder
 
 RUN apt-get update && \
     apt-get install -y git bison flex texinfo --no-install-recommends && \
diff --git a/packages/gas/build/Dockerfile b/packages/gas/build/Dockerfile
index d89ccde..80dd163 100644
--- a/packages/gas/build/Dockerfile
+++ b/packages/gas/build/Dockerfile
@@ -1,4 +1,4 @@
-FROM emscripten/emsdk:4.0.19 AS builder
+FROM emscripten/emsdk:4.0.20 AS builder
 
 RUN apt-get update && \
     apt-get install -y git bison flex texinfo parallel --no-install-recommends && \