diff --git a/docs/src/manpage.md b/docs/src/manpage.md
index 70bb446bc..b14302cc6 100644
--- a/docs/src/manpage.md
+++ b/docs/src/manpage.md
@@ -50,7 +50,7 @@ MILLER(1)                                                            MILLER(1)
        insertion-ordered hash map.  This encompasses a variety of data
        formats, including but not limited to the familiar CSV, TSV, and JSON.
        (Miller can handle positionally-indexed data as a special case.) This
-       manpage documents mlr 6.6.0.
+       manpage documents mlr 6.6.0-dev.
 
 1mEXAMPLES0m
        mlr --icsv --opprint cat example.csv
diff --git a/docs/src/manpage.txt b/docs/src/manpage.txt
index 224be2520..51d48012b 100644
--- a/docs/src/manpage.txt
+++ b/docs/src/manpage.txt
@@ -29,7 +29,7 @@ MILLER(1)                                                            MILLER(1)
        insertion-ordered hash map.  This encompasses a variety of data
        formats, including but not limited to the familiar CSV, TSV, and JSON.
        (Miller can handle positionally-indexed data as a special case.) This
-       manpage documents mlr 6.6.0.
+       manpage documents mlr 6.6.0-dev.
 
 1mEXAMPLES0m
        mlr --icsv --opprint cat example.csv
diff --git a/internal/pkg/version/version.go b/internal/pkg/version/version.go
index 96afe00cc..f550dfc24 100644
--- a/internal/pkg/version/version.go
+++ b/internal/pkg/version/version.go
@@ -4,4 +4,4 @@ package version
 // Nominally things like "6.0.0" for a release, then "6.0.0-dev" in between.
 // This makes it clear that a given build is on the main dev branch, not a
 // particular snapshot tag.
-var STRING string = "6.6.0"
+var STRING string = "6.6.0-dev"
diff --git a/man/manpage.txt b/man/manpage.txt
index 224be2520..51d48012b 100644
--- a/man/manpage.txt
+++ b/man/manpage.txt
@@ -29,7 +29,7 @@ MILLER(1)                                                            MILLER(1)
        insertion-ordered hash map.  This encompasses a variety of data
        formats, including but not limited to the familiar CSV, TSV, and JSON.
        (Miller can handle positionally-indexed data as a special case.) This
-       manpage documents mlr 6.6.0.
+       manpage documents mlr 6.6.0-dev.
 
 1mEXAMPLES0m
        mlr --icsv --opprint cat example.csv
diff --git a/man/mlr.1 b/man/mlr.1
index 99c5f4aac..6c4394923 100644
--- a/man/mlr.1
+++ b/man/mlr.1
@@ -47,7 +47,7 @@ on integer-indexed fields: if the natural data structure for the latter is the
 array, then Miller's natural data structure is the insertion-ordered hash map.
 This encompasses a variety of data formats, including but not limited to the
 familiar CSV, TSV, and JSON.  (Miller can handle positionally-indexed data as
-a special case.) This manpage documents mlr 6.6.0.
+a special case.) This manpage documents mlr 6.6.0-dev.
 .SH "EXAMPLES"
 .sp