diff --git a/.drom b/.drom
index 01041a6..40945e5 100644
--- a/.drom
+++ b/.drom
@@ -2,17 +2,17 @@
 
 # hash of toml configuration files
 # used for generation of all files
-0e9b66abb305f418e9c6701323bd855d:.
+eaf0d0bd408cc31f56f28cae7aabc539:.
 # end context for .
 
 # begin context for .github/workflows/doc-deploy.yml
 # file .github/workflows/doc-deploy.yml
-f98976f98b0215fd0f98718976ab0756:.github/workflows/doc-deploy.yml
+e5c654f9557b31aa070c7ef28060ae9e:.github/workflows/doc-deploy.yml
 # end context for .github/workflows/doc-deploy.yml
 
 # begin context for .github/workflows/workflow.yml
 # file .github/workflows/workflow.yml
-567136f433695a73febc90f5a2a69967:.github/workflows/workflow.yml
+6d0739e985277a2c6ee4e7f98ea45b24:.github/workflows/workflow.yml
 # end context for .github/workflows/workflow.yml
 
 # begin context for .gitignore
@@ -37,7 +37,7 @@ a8d1bcd6f62c6b813b77d3ff8959d8d2:.ocamlformat-ignore
 
 # begin context for CHANGES.md
 # file CHANGES.md
-5aadc83c9bdcbe1346be4cbe5e2dfea7:CHANGES.md
+d15a796a0dc7cb31a6a917998e7f5f8e:CHANGES.md
 # end context for CHANGES.md
 
 # begin context for LICENSE.md
@@ -97,12 +97,12 @@ c8281f46ba9a11d0b61bc8ef67eaa357:docs/style.css
 
 # begin context for dune-project
 # file dune-project
-4eda589dedb472f06b76ba8e66710e52:dune-project
+99b59bc5699daeee756ea487634c9e65:dune-project
 # end context for dune-project
 
 # begin context for ez_hash.opam
 # file ez_hash.opam
-961240618ebc27ee726b8e96918af860:ez_hash.opam
+ebb17ef384f5f507750f9dbf99bd4634:ez_hash.opam
 # end context for ez_hash.opam
 
 # begin context for scripts/after.sh
@@ -122,27 +122,27 @@ bb3a9d286f0dc64021db4194427263ee:scripts/copy-bin.sh
 
 # begin context for solidity-alcotest.opam
 # file solidity-alcotest.opam
-f6e0864e7e9dbb168402f42292970f8a:solidity-alcotest.opam
+46c7ae6bddb0890e6e4aef40dcd859f6:solidity-alcotest.opam
 # end context for solidity-alcotest.opam
 
 # begin context for solidity-common.opam
 # file solidity-common.opam
-f80014505a175a739b826cca6d89072c:solidity-common.opam
+7ee642e4fb70f30e8d144390bc3fb0d8:solidity-common.opam
 # end context for solidity-common.opam
 
 # begin context for solidity-parser.opam
 # file solidity-parser.opam
-b198f4ea160926c6b9bf02ea7c8c2f0a:solidity-parser.opam
+6940d87ea57a5ed719e6d8df015d6783:solidity-parser.opam
 # end context for solidity-parser.opam
 
 # begin context for solidity-test.opam
 # file solidity-test.opam
-b7b33c746586515a74b432329603ba11:solidity-test.opam
+fe2781ece8eb3681fcd92d1dcff3155c:solidity-test.opam
 # end context for solidity-test.opam
 
 # begin context for solidity-typechecker.opam
 # file solidity-typechecker.opam
-277a8cedf9280f8d375eb00bcd7305c4:solidity-typechecker.opam
+dbf3d1e4092a9ccd80a55946c961ec44:solidity-typechecker.opam
 # end context for solidity-typechecker.opam
 
 # begin context for sphinx/_static/css/fixes.css
@@ -197,7 +197,7 @@ e86f9a67236dac57aaae3ca819cb7dbb:src/ocaml-solidity/package.toml
 
 # begin context for src/solidity-alcotest/version.mlt
 # file src/solidity-alcotest/version.mlt
-06d7b97cb774143de55aa8972a6d084d:src/solidity-alcotest/version.mlt
+275d671a55d9bee3b649991bd4823c43:src/solidity-alcotest/version.mlt
 # end context for src/solidity-alcotest/version.mlt
 
 # begin context for src/solidity-common/dune
@@ -217,7 +217,7 @@ e86f9a67236dac57aaae3ca819cb7dbb:src/ocaml-solidity/package.toml
 
 # begin context for src/solidity-common/version.mlt
 # file src/solidity-common/version.mlt
-06d7b97cb774143de55aa8972a6d084d:src/solidity-common/version.mlt
+275d671a55d9bee3b649991bd4823c43:src/solidity-common/version.mlt
 # end context for src/solidity-common/version.mlt
 
 # begin context for src/solidity-parser/dune
@@ -237,7 +237,7 @@ be413a351ddaf3cdf0d44e91ad35680e:src/solidity-parser/main.ml
 
 # begin context for src/solidity-parser/version.mlt
 # file src/solidity-parser/version.mlt
-06d7b97cb774143de55aa8972a6d084d:src/solidity-parser/version.mlt
+275d671a55d9bee3b649991bd4823c43:src/solidity-parser/version.mlt
 # end context for src/solidity-parser/version.mlt
 
 # begin context for src/solidity-test/dune
@@ -247,7 +247,7 @@ be413a351ddaf3cdf0d44e91ad35680e:src/solidity-parser/main.ml
 
 # begin context for src/solidity-test/version.mlt
 # file src/solidity-test/version.mlt
-06d7b97cb774143de55aa8972a6d084d:src/solidity-test/version.mlt
+275d671a55d9bee3b649991bd4823c43:src/solidity-test/version.mlt
 # end context for src/solidity-test/version.mlt
 
 # begin context for src/solidity-typechecker/dune
@@ -267,5 +267,5 @@ be413a351ddaf3cdf0d44e91ad35680e:src/solidity-parser/main.ml
 
 # begin context for src/solidity-typechecker/version.mlt
 # file src/solidity-typechecker/version.mlt
-06d7b97cb774143de55aa8972a6d084d:src/solidity-typechecker/version.mlt
+275d671a55d9bee3b649991bd4823c43:src/solidity-typechecker/version.mlt
 # end context for src/solidity-typechecker/version.mlt
diff --git a/.github/workflows/doc-deploy.yml b/.github/workflows/doc-deploy.yml
index 9be6278..ce2d31e 100644
--- a/.github/workflows/doc-deploy.yml
+++ b/.github/workflows/doc-deploy.yml
@@ -20,9 +20,9 @@ jobs:
           path: ~/.opam
           key: v1-Linux-ocaml-solidity-4.10.0-${{ hashFiles('*.opam') }}
       - name: setup-ocaml
-        uses: avsm/setup-ocaml@v1
+        uses: avsm/setup-ocaml@v2
         with:
-          ocaml-version: 4.10.0
+          ocaml-compiler: 4.10.0
       - name: setup-doc
         run: |
           sudo apt install -yqq python3-sphinx python3-sphinx-rtd-theme
diff --git a/.github/workflows/workflow.yml b/.github/workflows/workflow.yml
index 79e7862..56cc145 100644
--- a/.github/workflows/workflow.yml
+++ b/.github/workflows/workflow.yml
@@ -16,14 +16,14 @@ jobs:
         os:
           - ubuntu-latest
           - macos-latest
-        ocaml-version:
+        ocaml-compiler:
           - 4.10.0
         skip_test:
           - false
 
         include:
           - os: ubuntu-latest
-            ocaml-version: 4.08.0
+            ocaml-compiler: 4.08.0
             skip_test: true
 
 
@@ -38,14 +38,14 @@ jobs:
         id: cache-opam
         with:
           path: ~/.opam
-          key: v1-${{ runner.os }}-ocaml-solidity-${{ matrix.ocaml-version }}-${{ hashFiles('*.opam') }}
+          key: v2-${{ runner.os }}-ocaml-solidity-${{ matrix.ocaml-compiler }}-${{ hashFiles('*.opam') }}
 #          restore-keys: |
-#            v1-${{ runner.os }}-opam-${{ matrix.ocaml-version }}-
+#            v2-${{ runner.os }}-opam-${{ matrix.ocaml-compiler }}-
 
-      - name: Use OCaml ${{ matrix.ocaml-version }}
-        uses: avsm/setup-ocaml@v1
+      - name: Use OCaml ${{ matrix.ocaml-compiler }}
+        uses: avsm/setup-ocaml@v2
         with:
-          ocaml-version: ${{ matrix.ocaml-version }}
+          ocaml-compiler: ${{ matrix.ocaml-compiler }}
 
       - name: Set git user
         run: |
@@ -80,4 +80,4 @@ jobs:
       - name: test source is well formatted
         run: make fmt
         continue-on-error: true
-        if: matrix.ocaml-version == '4.10.0' && matrix.os == 'ubuntu-latest'
+        if: matrix.ocaml-compiler == '4.10.0' && matrix.os == 'ubuntu-latest'
diff --git a/CHANGES.md b/CHANGES.md
index 957a44e..7e0b203 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -1,4 +1,4 @@
 
-## v0.1.0 ( 2021-08-25 )
+## v0.1.0 ( 2021-09-06 )
 
 * Initial commit
diff --git a/drom.toml b/drom.toml
index db12218..4429ddf 100644
--- a/drom.toml
+++ b/drom.toml
@@ -15,7 +15,7 @@ license = "LGPL2"
 min-edition = "4.08.0"
 name = "ocaml-solidity"
 synopsis = "The ocaml-solidity project"
-version = "0.3.5"
+version = "0.3.6"
 
 # keys that you could also define:
 # odoc-target = "...odoc-target..."
diff --git a/dune-project b/dune-project
index dac89a1..3b690e8 100644
--- a/dune-project
+++ b/dune-project
@@ -3,7 +3,7 @@
 (name ocaml-solidity)
 (allow_approximate_merlin)
 (generate_opam_files false)
-(version 0.3.5)
+(version 0.3.6)
 (formatting (enabled_for ocaml reason))
 (using menhir 2.0)
 
diff --git a/ez_hash.opam b/ez_hash.opam
index d5ff75a..3db23a7 100644
--- a/ez_hash.opam
+++ b/ez_hash.opam
@@ -2,7 +2,7 @@
 # Do not modify, or add to the `skip` field of `drom.toml`.
 opam-version: "2.0"
 name: "ez_hash"
-version: "0.3.5"
+version: "0.3.6"
 license: "LGPL-2.1-only with OCaml-LGPL-linking-exception"
 synopsis: "Hash functions: sha3, sha256, blake2b"
 description: """
diff --git a/solidity-alcotest.opam b/solidity-alcotest.opam
index 14e9b4f..1ec3ad6 100644
--- a/solidity-alcotest.opam
+++ b/solidity-alcotest.opam
@@ -2,7 +2,7 @@
 # Do not modify, or add to the `skip` field of `drom.toml`.
 opam-version: "2.0"
 name: "solidity-alcotest"
-version: "0.3.5"
+version: "0.3.6"
 license: "LGPL-2.1-only with OCaml-LGPL-linking-exception"
 synopsis: "The ocaml-solidity project"
 description: """
diff --git a/solidity-common.opam b/solidity-common.opam
index 9e208f3..45d7f4e 100644
--- a/solidity-common.opam
+++ b/solidity-common.opam
@@ -2,7 +2,7 @@
 # Do not modify, or add to the `skip` field of `drom.toml`.
 opam-version: "2.0"
 name: "solidity-common"
-version: "0.3.5"
+version: "0.3.6"
 license: "LGPL-2.1-only with OCaml-LGPL-linking-exception"
 synopsis: "The ocaml-solidity project"
 description: """
diff --git a/solidity-parser.opam b/solidity-parser.opam
index af098da..793e642 100644
--- a/solidity-parser.opam
+++ b/solidity-parser.opam
@@ -2,7 +2,7 @@
 # Do not modify, or add to the `skip` field of `drom.toml`.
 opam-version: "2.0"
 name: "solidity-parser"
-version: "0.3.5"
+version: "0.3.6"
 license: "LGPL-2.1-only with OCaml-LGPL-linking-exception"
 synopsis: "The ocaml-solidity project"
 description: """
diff --git a/solidity-test.opam b/solidity-test.opam
index efda030..283210d 100644
--- a/solidity-test.opam
+++ b/solidity-test.opam
@@ -2,7 +2,7 @@
 # Do not modify, or add to the `skip` field of `drom.toml`.
 opam-version: "2.0"
 name: "solidity-test"
-version: "0.3.5"
+version: "0.3.6"
 license: "LGPL-2.1-only with OCaml-LGPL-linking-exception"
 synopsis: "The ocaml-solidity project"
 description: """
diff --git a/solidity-typechecker.opam b/solidity-typechecker.opam
index bd5abd2..049e36e 100644
--- a/solidity-typechecker.opam
+++ b/solidity-typechecker.opam
@@ -2,7 +2,7 @@
 # Do not modify, or add to the `skip` field of `drom.toml`.
 opam-version: "2.0"
 name: "solidity-typechecker"
-version: "0.3.5"
+version: "0.3.6"
 license: "LGPL-2.1-only with OCaml-LGPL-linking-exception"
 synopsis: "The ocaml-solidity project"
 description: """
diff --git a/src/solidity-alcotest/version.mlt b/src/solidity-alcotest/version.mlt
index 040165c..7ae3c0f 100644
--- a/src/solidity-alcotest/version.mlt
+++ b/src/solidity-alcotest/version.mlt
@@ -13,7 +13,7 @@ let query cmd =
 
 let commit_hash = query "git show -s --pretty=format:%H"
 let commit_date = query "git show -s --pretty=format:%ci"
-let version = "0.3.5"
+let version = "0.3.6"
 let version =
   match commit_hash with
   | Some commit_hash ->
diff --git a/src/solidity-common/version.mlt b/src/solidity-common/version.mlt
index 040165c..7ae3c0f 100644
--- a/src/solidity-common/version.mlt
+++ b/src/solidity-common/version.mlt
@@ -13,7 +13,7 @@ let query cmd =
 
 let commit_hash = query "git show -s --pretty=format:%H"
 let commit_date = query "git show -s --pretty=format:%ci"
-let version = "0.3.5"
+let version = "0.3.6"
 let version =
   match commit_hash with
   | Some commit_hash ->
diff --git a/src/solidity-parser/version.mlt b/src/solidity-parser/version.mlt
index 040165c..7ae3c0f 100644
--- a/src/solidity-parser/version.mlt
+++ b/src/solidity-parser/version.mlt
@@ -13,7 +13,7 @@ let query cmd =
 
 let commit_hash = query "git show -s --pretty=format:%H"
 let commit_date = query "git show -s --pretty=format:%ci"
-let version = "0.3.5"
+let version = "0.3.6"
 let version =
   match commit_hash with
   | Some commit_hash ->
diff --git a/src/solidity-test/version.mlt b/src/solidity-test/version.mlt
index 040165c..7ae3c0f 100644
--- a/src/solidity-test/version.mlt
+++ b/src/solidity-test/version.mlt
@@ -13,7 +13,7 @@ let query cmd =
 
 let commit_hash = query "git show -s --pretty=format:%H"
 let commit_date = query "git show -s --pretty=format:%ci"
-let version = "0.3.5"
+let version = "0.3.6"
 let version =
   match commit_hash with
   | Some commit_hash ->
diff --git a/src/solidity-typechecker/solidity_type_conv.ml b/src/solidity-typechecker/solidity_type_conv.ml
index 4221c86..6e52e27 100644
--- a/src/solidity-typechecker/solidity_type_conv.ml
+++ b/src/solidity-typechecker/solidity_type_conv.ml
@@ -250,6 +250,8 @@ let rec explicitly_convertible ~from ~to_ : type_ option =
   | TEnum _, (TInt _ | TUint _) ->
       Some (to_)
 
+  | TFixBytes 1, TUint 8 when !for_freeton -> Some (to_)
+
   | _ ->
       if_true (Solidity_type.same_type from to_)
 
diff --git a/src/solidity-typechecker/version.mlt b/src/solidity-typechecker/version.mlt
index 040165c..7ae3c0f 100644
--- a/src/solidity-typechecker/version.mlt
+++ b/src/solidity-typechecker/version.mlt
@@ -13,7 +13,7 @@ let query cmd =
 
 let commit_hash = query "git show -s --pretty=format:%H"
 let commit_date = query "git show -s --pretty=format:%ci"
-let version = "0.3.5"
+let version = "0.3.6"
 let version =
   match commit_hash with
   | Some commit_hash ->