diff --git a/.appveyor.yml b/.appveyor.yml
index 5b05644..fe9c091 100644
--- a/.appveyor.yml
+++ b/.appveyor.yml
@@ -1,6 +1,6 @@
 environment:
   matrix:
-  - julia_version: 1.0
+  - julia_version: 1.5
   - julia_version: latest
 
 platform:
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index f23752d..f12f693 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -10,7 +10,7 @@ jobs:
       fail-fast: false
       matrix:
         version:
-          - '1.0'
+          - '1.5'
           - 'nightly'
         os:
           - ubuntu-latest
diff --git a/NEWS.md b/NEWS.md
index 1c7da35..ca35a5b 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -1,3 +1,9 @@
+# 2023-06-20
+
+Dropped Julia 1.0-1.4 support.
+
+Added support for `@smart_assert` from [SmartAsserts.jl](https://github.com/MrVPlusOne/SmartAsserts.jl) in type-body.
+
 # 2021-01-22
 Added `@consts` macro to define a block of constants.
 
diff --git a/Project.toml b/Project.toml
index 86a250c..1c3a138 100644
--- a/Project.toml
+++ b/Project.toml
@@ -10,12 +10,13 @@ UnPack = "3a884ed6-31ef-47d7-9d2a-63182c4928ed"
 [compat]
 OrderedCollections = "1"
 UnPack = "0.1, 1.0"
-julia = "1"
+julia = "1.5"
 
 [extras]
 Markdown = "d6f4376e-aef5-505a-96c1-9c027394607a"
 REPL = "3fa0cd96-eef1-5676-8a61-b3b8758bbffb"
 Test = "8dfed614-e22c-5e08-85e1-65c5234f0b40"
+SmartAsserts = "56560af0-ab70-43fe-a531-155d81972b00"
 
 [targets]
-test = ["REPL", "Test", "Markdown"]
+test = ["REPL", "Test", "Markdown", "SmartAsserts"]
diff --git a/docs/src/manual.md b/docs/src/manual.md
index 5983c58..b04c3af 100644
--- a/docs/src/manual.md
+++ b/docs/src/manual.md
@@ -36,10 +36,12 @@ pp3 = PhysicalPara(pp2; cw=.11e-7, rw=100.)
 pp4 = PhysicalPara(1,2,3,4,5,6)
 ```
 
-To enforce constraints on the values, it's possible to use `@assert`s
+To enforce constraints on the values, it's possible to use `@assert`s or `@smart_assert`[^1]
 straight inside the type-def. (As usual, for mutables these
 asserts can be violated by updating the fields after type construction.)
 
+[^1]: `@smart_assert` is defined in [SmartAsserts.jl](https://github.com/MrVPlusOne/SmartAsserts.jl).
+
 ```julia
 @with_kw struct PhysicalPara2{R}
     rw::R = 1000.; @assert rw>0
diff --git a/src/Parameters.jl b/src/Parameters.jl
index da6663d..47945ff 100644
--- a/src/Parameters.jl
+++ b/src/Parameters.jl
@@ -390,7 +390,7 @@ function with_kw(typedef, mod::Module, withshow=true)
             push!(lns2, l)
             continue
         end
-        if l.head==:macrocall && l.args[1]!=Symbol("@assert")
+        if l.head==:macrocall && l.args[1] != Symbol("@assert") && l.args[1] != Symbol("@smart_assert")
             tmp = macroexpand(mod, l)
             if tmp.head==:block
                 llns = Lines(tmp)
@@ -456,7 +456,7 @@ function with_kw(typedef, mod::Module, withshow=true)
                 # unwrap-macro
                 push!(unpack_vars, decolon2(fld))
             end
-        elseif l.head==:macrocall  && l.args[1]==Symbol("@assert")
+        elseif l.head==:macrocall && (l.args[1]==Symbol("@assert") || l.args[1]==Symbol("@smart_assert"))
             # store all asserts
             push!(asserts, l)
         elseif l.head==:function # inner constructor
diff --git a/test/runtests.jl b/test/runtests.jl
index 79e9286..eb7a3a2 100644
--- a/test/runtests.jl
+++ b/test/runtests.jl
@@ -1,4 +1,4 @@
-using Parameters, Test, Markdown, REPL
+using Parameters, Test, Markdown, REPL, SmartAsserts
 
 # reconstruct
 a8679 = (a=1, b=2)
@@ -378,6 +378,34 @@ end
 @test_throws AssertionError MT12a([1,2])
 @test MT12a([1]).a==MT12a(a=[1]).a
 
+### Smart Assertions
+
+@with_kw struct MT12Smart
+    a=5; @smart_assert a>=5
+    b
+    @smart_assert b>a
+end
+
+@test_throws AssertionError MT12Smart(b=2)
+@test_throws AssertionError MT12Smart(a=1,b=2)
+@test MT12Smart(b=6)==MT12Smart(5,6)
+
+# only asserts allowed if no inner constructors
+@test_throws ErrorException Parameters.with_kw(:(struct MT13Smart
+                                                a=5;
+                                                @smart_assert a>=5
+                                                MT13Smart(a) = new(8)
+                                                end),
+                                            @__MODULE__)
+
+# issue #29: assertions with parameterized types
+@with_kw struct MT12aSmart{R}
+    a::Array{R,1}
+    @smart_assert 1 == length(a)
+end
+@test_throws AssertionError MT12aSmart([1,2])
+@test MT12aSmart([1]).a==MT12aSmart(a=[1]).a
+
 ####
 # issue 10: infer type parameters from kw-args
 @with_kw struct I10{T} @deftype Int