diff --git a/docker/Dockerfile b/docker/Dockerfile
index 1ee9a70ed1da57861e15fa5a0ea509664e5e8b90..6bd7ed33ced37d150ab1639b6ac6165b3ea68017 100644
--- a/docker/Dockerfile
+++ b/docker/Dockerfile
@@ -1,4 +1,4 @@
-# Dockerfile for binary_c (2.1.5) and binary_grid2 (2.1.5)
+# Dockerfile for binary_c (2.1.6) and binary_grid2 (2.1.6)
 # based on Ubuntu 18.04
 
 FROM ubuntu:18.04
@@ -212,7 +212,7 @@ RUN cpanm Sort::Key
 RUN perl ./install_all.pl
 RUN cpanm Proc::ProcessTable
 RUN cpanm Cpanel::JSON::XS
-RUN cpanm -v ./binary_grid-v2.1.5.tar.gz
+RUN cpanm -v ./binary_grid-v2.1.6.tar.gz
 
 ############################################################
 # cleanup: cpanm and build directories
diff --git a/src/binary_c_version.h b/src/binary_c_version.h
index 66eae873899ab1d780d8daa1ce4644e20f7fc6b4..c9a5516f13b79825ba5a2e1aa6087bd929307023 100644
--- a/src/binary_c_version.h
+++ b/src/binary_c_version.h
@@ -30,7 +30,7 @@
  * 
  * Patch is zero for a major release.  
  */
-#define BINARY_C_VERSION "2.1.5"
+#define BINARY_C_VERSION "2.1.6"
 
 /* and a CEMP run version */
 #define CEMP_VERSION "prelim10-O1-noCNEMPs"
diff --git a/src/perl/modules_targz/Binning-0.03.tar.gz b/src/perl/modules_targz/Binning-0.03.tar.gz
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diff --git a/src/perl/modules_targz/Data-Serializer-RobJSON-0.05.tar.gz b/src/perl/modules_targz/Data-Serializer-RobJSON-0.05.tar.gz
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diff --git a/src/perl/modules_targz/Histogram-0.01.tar.gz b/src/perl/modules_targz/Histogram-0.01.tar.gz
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diff --git a/src/perl/modules_targz/IMF-0.05.tar.gz b/src/perl/modules_targz/IMF-0.05.tar.gz
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diff --git a/src/perl/modules_targz/Maths_Double-0.01.tar.gz b/src/perl/modules_targz/Maths_Double-0.01.tar.gz
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diff --git a/src/perl/modules_targz/binary_grid-v2.1.5.tar.gz b/src/perl/modules_targz/binary_grid-v2.1.5.tar.gz
deleted file mode 100644
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diff --git a/src/perl/modules_targz/binary_grid-v2.1.6.tar.gz b/src/perl/modules_targz/binary_grid-v2.1.6.tar.gz
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