diff --git a/Dockerfile b/Dockerfile
index 6f03cf984..ae087026e 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -3,8 +3,10 @@ FROM ocaml/opam-dev@sha256:64dc0522876ebbd27b186e3ba955ae5ab864ace580add5b0d1abb
 ENV OPAMERRLOGLEN=0 OPAMYES=1
 RUN sudo apk add tzdata aspcud gmp-dev perl
 
-RUN opam pin add irmin.1.1.0 -n https://github.com/mirage/irmin.git#89196ad17c53b02f333022a87ecc264ec8c06af0
-RUN opam pin add irmin-git.1.1.0 -n https://github.com/mirage/irmin.git#89196ad17c53b02f333022a87ecc264ec8c06af0
+RUN opam pin add irmin.1.2.0 -n https://github.com/mirage/irmin.git#ca886ac8e1a0b36879617d7c973852d6d04bfede
+RUN opam pin add irmin-mem.1.2.0 -n https://github.com/mirage/irmin.git#ca886ac8e1a0b36879617d7c973852d6d04bfede
+RUN opam pin add irmin-git.1.2.0 -n https://github.com/mirage/irmin.git#ca886ac8e1a0b36879617d7c973852d6d04bfede
+
 RUN opam pin add -yn protocol-9p.0.11.0 'https://github.com/mirage/ocaml-9p.git#v0.11.0'
 RUN opam pin add -yn protocol-9p-unix.0.11.0 'https://github.com/mirage/ocaml-9p.git#v0.11.0'
 
diff --git a/Dockerfile.ci b/Dockerfile.ci
index dcb0556cb..bd9374416 100644
--- a/Dockerfile.ci
+++ b/Dockerfile.ci
@@ -3,9 +3,12 @@ FROM ocaml/opam-dev@sha256:64dc0522876ebbd27b186e3ba955ae5ab864ace580add5b0d1abb
 ENV OPAMERRLOGLEN=0 OPAMYES=1
 RUN sudo apk add tzdata aspcud
 
-RUN opam pin add irmin.1.1.0 -n https://github.com/mirage/irmin.git#89196ad17c53b02f333022a87ecc264ec8c06af0
-RUN opam pin add irmin-git.1.1.0 -n https://github.com/mirage/irmin.git#89196ad17c53b02f333022a87ecc264ec8c06af0
-RUN opam pin add irmin-unix.1.1.0 -n https://github.com/mirage/irmin.git#89196ad17c53b02f333022a87ecc264ec8c06af0
+RUN opam pin add irmin.1.2.0 -n https://github.com/mirage/irmin.git#ca886ac8e1a0b36879617d7c973852d6d04bfede
+RUN opam pin add irmin-mem.1.2.0 -n https://github.com/mirage/irmin.git#ca886ac8e1a0b36879617d7c973852d6d04bfede
+RUN opam pin add irmin-fs.1.2.0 -n https://github.com/mirage/irmin.git#ca886ac8e1a0b36879617d7c973852d6d04bfede
+RUN opam pin add irmin-http.1.2.0 -n https://github.com/mirage/irmin.git#ca886ac8e1a0b36879617d7c973852d6d04bfede
+RUN opam pin add irmin-git.1.2.0 -n https://github.com/mirage/irmin.git#ca886ac8e1a0b36879617d7c973852d6d04bfede
+RUN opam pin add irmin-unix.1.2.0 -n https://github.com/mirage/irmin.git#ca886ac8e1a0b36879617d7c973852d6d04bfede
 
 RUN opam pin add -yn protocol-9p.0.11.0 'https://github.com/mirage/ocaml-9p.git#v0.11.0'
 RUN opam pin add -yn protocol-9p-unix.0.11.0 'https://github.com/mirage/ocaml-9p.git#v0.11.0'
diff --git a/Dockerfile.github b/Dockerfile.github
index dc14e8d56..ec51b25f9 100644
--- a/Dockerfile.github
+++ b/Dockerfile.github
@@ -3,8 +3,10 @@ FROM ocaml/opam-dev@sha256:64dc0522876ebbd27b186e3ba955ae5ab864ace580add5b0d1abb
 ENV OPAMERRLOGLEN=0 OPAMYES=1
 RUN sudo apk add tzdata aspcud
 
-RUN opam pin add irmin.1.1.0 -n https://github.com/mirage/irmin.git#89196ad17c53b02f333022a87ecc264ec8c06af0
-RUN opam pin add irmin-git.1.1.0 -n https://github.com/mirage/irmin.git#89196ad17c53b02f333022a87ecc264ec8c06af0
+RUN opam pin add irmin.1.2.0 -n https://github.com/mirage/irmin.git#ca886ac8e1a0b36879617d7c973852d6d04bfede
+RUN opam pin add irmin-mem.1.2.0 -n https://github.com/mirage/irmin.git#ca886ac8e1a0b36879617d7c973852d6d04bfede
+RUN opam pin add irmin-git.1.2.0 -n https://github.com/mirage/irmin.git#ca886ac8e1a0b36879617d7c973852d6d04bfede
+
 RUN opam pin add -yn protocol-9p.0.11.0 'https://github.com/mirage/ocaml-9p.git#v0.11.0'
 RUN opam pin add -yn protocol-9p-unix.0.11.0 'https://github.com/mirage/ocaml-9p.git#v0.11.0'
 
diff --git a/appveyor.yml b/appveyor.yml
index 83b6a7de5..7134f5d96 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -6,7 +6,7 @@ environment:
   FORK_BRANCH: master
   CYG_ROOT: C:\cygwin64
   PACKAGE: datakit
-  PINS: "irmin.1.1.0:--dev irmin-git.1.1.0:--dev datakit-server.dev:. datakit-server-9p.dev:. datakit-github.dev:. datakit-client.dev:. datakit-client-9p.dev:."
+  PINS: "irmin.dev:--dev irmin-mem.dev:https://github.com/mirage/irmin.git#ca886ac8e1a0b36879617d7c973852d6d04bfede irmin-git.dev:--dev datakit-server.dev:. datakit-server-9p.dev:. datakit-github.dev:. datakit-client.dev:. datakit-client-9p.dev:."
 
 install:
   - ps: iex ((new-object net.webclient).DownloadString("https://raw.githubusercontent.com/$env:FORK_USER/ocaml-ci-scripts/$env:FORK_BRANCH/appveyor-install.ps1"))
diff --git a/circle.yml b/circle.yml
index 16e9d50d7..fcf2e7879 100644
--- a/circle.yml
+++ b/circle.yml
@@ -18,8 +18,9 @@ dependencies:
   - opam init --comp system -n https://github.com/ocaml/opam-repository.git
   - opam switch system
   - opam pin add hvsock --dev -n
-  - opam pin add irmin.1.1.0 --dev -n
-  - opam pin add irmin-git.1.1.0 --dev -n
+  - opam pin add irmin.1.2.0 --dev -n
+  - opam pin add irmin-mem.1.2.0 -n https://github.com/mirage/irmin.git#ca886ac8e1a0b36879617d7c973852d6d04bfede
+  - opam pin add irmin-git.1.2.0 --dev -n
   - opam pin add datakit-server.dev . -n
   - opam pin add datakit-server-9p.dev . -n
   - opam pin add datakit.dev . -n
diff --git a/datakit.opam b/datakit.opam
index 8509b6e01..e9909728b 100644
--- a/datakit.opam
+++ b/datakit.opam
@@ -18,6 +18,7 @@ depends: [
   "git"         {>= "1.9.3"}
   "uri"
   "irmin"       {>= "1.1.0"}
+  "irmin-mem"
   "irmin-git"   {>= "1.0.0"}
   "camlzip"     {>= "1.06"}
   "cstruct"     {>= "2.2"}
diff --git a/src/datakit/jbuild b/src/datakit/jbuild
index 7a0fbe186..ab91b5b37 100644
--- a/src/datakit/jbuild
+++ b/src/datakit/jbuild
@@ -5,4 +5,4 @@
   (public_name datakit)
   (wrapped     false)
   (libraries   (datakit_io bytes lwt astring logs result cstruct fmt rresult
-                irmin datakit-server asetmap prometheus-app))))
+                irmin-mem datakit-server asetmap prometheus-app))))