diff --git a/3.6/Dockerfile b/3.6/Dockerfile
index 5e703d2..b7760f7 100644
--- a/3.6/Dockerfile
+++ b/3.6/Dockerfile
@@ -14,7 +14,7 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
 	&& rm -rf /var/lib/apt/lists/*
 
 ENV GPG_KEY 0D96DF4D4110E5C43FBFB17F2D347EA6AA65421D
-ENV PYTHON_VERSION 3.6.0a4
+ENV PYTHON_VERSION 3.6.0b1
 
 # if this is called "PIP_VERSION", pip explodes with "ValueError: invalid truth value '<VERSION>'"
 ENV PYTHON_PIP_VERSION 8.1.2
diff --git a/3.6/alpine/Dockerfile b/3.6/alpine/Dockerfile
index 4c014f4..faa66a9 100644
--- a/3.6/alpine/Dockerfile
+++ b/3.6/alpine/Dockerfile
@@ -12,7 +12,7 @@ ENV LANG C.UTF-8
 RUN apk add --no-cache ca-certificates
 
 ENV GPG_KEY 0D96DF4D4110E5C43FBFB17F2D347EA6AA65421D
-ENV PYTHON_VERSION 3.6.0a4
+ENV PYTHON_VERSION 3.6.0b1
 
 # if this is called "PIP_VERSION", pip explodes with "ValueError: invalid truth value '<VERSION>'"
 ENV PYTHON_PIP_VERSION 8.1.2
diff --git a/3.6/slim/Dockerfile b/3.6/slim/Dockerfile
index ab7ade5..89f6f6d 100644
--- a/3.6/slim/Dockerfile
+++ b/3.6/slim/Dockerfile
@@ -15,7 +15,7 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
 	&& rm -rf /var/lib/apt/lists/*
 
 ENV GPG_KEY 0D96DF4D4110E5C43FBFB17F2D347EA6AA65421D
-ENV PYTHON_VERSION 3.6.0a4
+ENV PYTHON_VERSION 3.6.0b1
 
 # if this is called "PIP_VERSION", pip explodes with "ValueError: invalid truth value '<VERSION>'"
 ENV PYTHON_PIP_VERSION 8.1.2
diff --git a/3.6/windows/windowsservercore/Dockerfile b/3.6/windows/windowsservercore/Dockerfile
index b5fa44e..9fc019a 100644
--- a/3.6/windows/windowsservercore/Dockerfile
+++ b/3.6/windows/windowsservercore/Dockerfile
@@ -2,7 +2,7 @@ FROM microsoft/windowsservercore
 
 SHELL ["powershell", "-Command", "$ErrorActionPreference = 'Stop';"]
 
-ENV PYTHON_VERSION 3.6.0a4
+ENV PYTHON_VERSION 3.6.0b1
 ENV PYTHON_RELEASE 3.6.0
 
 # if this is called "PIP_VERSION", pip explodes with "ValueError: invalid truth value '<VERSION>'"